From philabs!prls!pyramid!hplabs!ucbvax!business.uwo.CA!MBramwel Fri Jan 6 09:25:27 EST 1989 Article 8568 of rec.ham-radio: Path: philabs!prls!pyramid!hplabs!ucbvax!business.uwo.CA!MBramwel >From: MBramwel@business.uwo.CA (Mark Bramwell 519 661-3714) Newsgroups: rec.ham-radio Subject: pro 2004 mods Message-ID: <8901051631.AA06073@julian.uwo.ca> Date: 5 Jan 89 15:16:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 34 Someone recently requested the mod for the Radio Shack PRO 2004 Here it is.......... PS: How does one post to the packet list?? ........................................................................... The PRO-2004 scanner can be used to receive cellular telephone conversations. Originally, the scanner was able to receive in this band, but at the last minute, it was decided to delete cellular coverage from the PRO-2004. The procedure to re-instate the cellular band is simple for anyone with a pair of cutters, and a phillips screw-driver. 1. Remove the four screws from the back of the radio, and slide off the cover from the chassis. 2. Turn the radio upside down. You will find a metal box-like sub- chassis in the center of the main chassis. Remove the cover and you will be looking at the CPU, a 64-pin integrated circuit. 3. Examine the component side of this board, and you will find a row of diodes and resistors. On one end of the row you will find a diode labeled D-513. 4. Clip the accessible end of D-513, and pry apart the ends so they don't touch. You have just restored cellular coverage to you scanner. 5. If D-513 is not there, it may be located on the underside of the circuit board. *** Information was extracted from POPULAR COMMUNICATIONS Aug 1987. From philabs!prls!pyramid!oliveb!ames!ncar!boulder!sunybcs!rutgers!elbereth.rutgers.edu!ron.rutgers.edu!ron Fri Jan 6 09:26:24 EST 1989 Article 8572 of rec.ham-radio: Path: philabs!prls!pyramid!oliveb!ames!ncar!boulder!sunybcs!rutgers!elbereth.rutgers.edu!ron.rutgers.edu!ron >From: ron@ron.rutgers.edu (Ron Natalie) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Keywords: mods, scanner Message-ID: Date: 5 Jan 89 23:08:56 GMT References: <3749@druwy.ATT.COM> Distribution: misc Organization: Rutgers Univ., New Brunswick, N.J. Lines: 10 Adjacent to the CPU chip there is a diode present in the modified units know as D513. D513 may or may not be marked depending on the age of your unit. D513 will be either next to D512 on the component side of the board or it will be the on the solder side of the board in the same place (i.e, next to the leads for D512). In addition, to get 30MHz steps when scanning 800 MHz (don't know why you'd want that ;-). Press the STEP key then press the RESET key right below it. -Ron From philabs!prls!pyramid!voder!apple!rutgers!mailrus!ames!pasteur!ucbvax!ucdavis!vega.ucdavis.edu!u546025938ea Mon Jan 9 09:21:53 EST 1989 Article 8638 of rec.ham-radio: Path: philabs!prls!pyramid!voder!apple!rutgers!mailrus!ames!pasteur!ucbvax!ucdavis!vega.ucdavis.edu!u546025938ea >From: u546025938ea@vega.ucdavis.edu (0040;0000009724;0;340;141;) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Summary: An extra 100 channels Message-ID: <3455@ucdavis.ucdavis.edu> Date: 8 Jan 89 02:30:51 GMT Sender: uucp@ucdavis.ucdavis.edu Reply-To: u546025938ea@vega.ucdavis.edu (Steve Meyer) Organization: University of California, Davis Lines: 23 In addition to the cellular band, your RS PRO-2004 can also be modified for another 100 channels of memory. To do this: - Take the diode that was pulled for cellular coverage - Place it in an adjacent socket (I'm not /exactly/ sure of the #) Presto! You now have a 400-channel scanner. If anyone is interested in the exact socket number, please e-mail me (this info. was provided by a friend, who is a PRO-2004 owner). Also, this mod is available in Pop Comm. 73, Steve N6QGG Steve Meyer, N6QGG Student, UC Davis Internet: smmeyer@ucdavis.edu Bitnet: smmeyer@ucdavis.bitnet UUCP: {ucbvax, lll-crg}!ucdavis!smmeyer P.S.: My apologies if this mod has already been posted; I just got back on the net after an absense of over 5 weeks :-) From philabs!prls!pyramid!oliveb!ames!xanth!mcnc!gatech!udel!rochester!pt.cs.cmu.edu!cadre!pitt!cisunx!chain Wed Jan 11 08:50:18 EST 1989 Article 8688 of rec.ham-radio: Path: philabs!prls!pyramid!oliveb!ames!xanth!mcnc!gatech!udel!rochester!pt.cs.cmu.edu!cadre!pitt!cisunx!chain >From: chain@cisunx.UUCP (Tom Link) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Message-ID: <14816@cisunx.UUCP> Date: 10 Jan 89 03:58:45 GMT References: <3455@ucdavis.ucdavis.edu> <2332@prdmgt.Columbia.NCR.COM> Reply-To: chain@unix.cis.pittsburgh.edu (Tom Link) Organization: The Zets Lines: 35 In article <2332@prdmgt.Columbia.NCR.COM> flake@prdmgt.UUCP (joe flake) writes: >In previous article: >>your RS PRO-2004 can also be modified for another 100 channels of memory >>Presto! You now have a 400-channel scanner. > >I've seen several references to this mod. All omit the details of how >the keyboard and scanning functions work AFTER the mod. Specifically, >a 2004 banks memorys as 10 banks of 30 memories. You can enable/disable >scanning a bank by hitting a single digit during scan operation. Where >do the new memories go? Does it become 10 banks of 40 memories, or do >you now have 3.3 new banks of 30 memories or what? Info is taken from December 1988 issue of Popular Communications: the diode # to be added is D510 (if there's a jumper present - remove it) polarity should point towards the cpu chip. now instead of 30 channels in each of the 10 memories banks you'll have 40 channels. I read some other mods in other issues of Pop com and in 73 i'll post the after i find them if nobody beats me to it 73 from a non-ham (hopefull a novist soon -- just need the code) posting his his first post and not knowing if it will work. -- | Tom Link, University of Pittsburgh Computer Science | BITNET: chain@pittunx | USENET: ...!pitt!cisunx!chain | ARPANET: chain%unix.cis.pittsburgh.edu@vb.cc.cmu.edu | CC-NET: chain::cisunx | UUCP: {decwrl!allegra,bellcore,cadre,psuvax1}!pitt!cisunx!tjw | AT&T: 1 (412) 731-6296 | US-MAIL : 310 Surrey Place, Pittsburgh PA 15235-5056, USA From philabs!prls!pyramid!oliveb!ames!mailrus!ncar!noao!asuvax!nud!xroads!coffin Wed Jan 11 09:14:44 EST 1989 Article 8711 of rec.ham-radio: Path: philabs!prls!pyramid!oliveb!ames!mailrus!ncar!noao!asuvax!nud!xroads!coffin >From: coffin@xroads.UUCP (Chris Coffin) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Message-ID: <539@xroads.UUCP> Date: 10 Jan 89 14:06:47 GMT References: <3455@ucdavis.ucdavis.edu> <2332@prdmgt.Columbia.NCR.COM> Reply-To: coffin@xroads.UUCP (Chris Coffin) Organization: Crossroads, Phoenix, AZ 85046 Lines: 38 joe flake (flake@prdmgt.UUCP) writes: > In previous article: > >your RS PRO-2004 can also be modified for another 100 channels of memory > > {details} > >Presto! You now have a 400-channel scanner. > [deleted verbage] > scanning a bank by hitting a single digit during scan operation. Where > do the new memories go? Does it become 10 banks of 40 memories, or do > you now have 3.3 new banks of 30 memories or what? > > Any reasons NOT to make the mod other than the obvious warranty issues? > It seems too good to be true! > I have made the 850MHz, 400 channel, and increased scanning speed mods to my PRO-2004. You end up with 10 banks of 40 channels each. After doing the mod, you have to reprogram all your frequencies in again. (no real surprise here). It all works just fine and dandy! Yes, it is too good to be true, but it is true and it works great! Chris this is food to fatten up the line eater -- \ / C r o s s r o a d s C o m m u n i c a t i o n s /\ (602) 941-2005 300|1200 Baud 24 hrs/day / \ hplabs!hp-sdd!crash!xroads!coffin From philabs!prls!pyramid!decwrl!hplabs!hp-sdd!ncr-sd!ncrlnk!ncrwic!encad!enprt!hburford Wed Jan 11 09:16:10 EST 1989 Article 8715 of rec.ham-radio: Path: philabs!prls!pyramid!decwrl!hplabs!hp-sdd!ncr-sd!ncrlnk!ncrwic!encad!enprt!hburford >From: hburford@enprt.Wichita.NCR.COM (Harry Burford) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Message-ID: <433@enprt.Wichita.NCR.COM> Date: 10 Jan 89 13:48:41 GMT References: <3455@ucdavis.ucdavis.edu> <2332@prdmgt.Columbia.NCR.COM> Reply-To: hburford@enprt.UUCP (Harry Burford) Organization: NCR Corporation, Wichita, Kansas Lines: 24 In article <2332@prdmgt.Columbia.NCR.COM> flake@prdmgt.UUCP (joe flake) writes: |>In previous article: |>>your RS PRO-2004 can also be modified for another 100 channels of memory |>> |>> {details} |>> |>>Presto! You now have a 400-channel scanner. |> |>I've seen several references to this mod. All omit the details of how |>the keyboard and scanning functions work AFTER the mod. Specifically, |>a 2004 banks memorys as 10 banks of 30 memories. You can enable/disable |>scanning a bank by hitting a single digit during scan operation. Where |>do the new memories go? Does it become 10 banks of 40 memories, or do |>you now have 3.3 new banks of 30 memories or what? |>Joe Flake, N4BGQ YES, after the channel mod. you will have 10 banks of 40 channels each. your keyboard labels for the channel banks becomes useless. hb -- Harry Burford - NCR E & M Wichita, Printer Engineering PHONE: 316-636-8016 Amateur Call: KA0TTY FAX: 316-636-8889 C-Serve: 76367,151 Harry.Burford@Wichita.NCR.COM From philabs!prls!pyramid!decwrl!labrea!agate!ucbvax!ucdavis!vega.ucdavis.edu!u546025938ea Thu Jan 12 08:39:07 EST 1989 Article 8738 of rec.ham-radio: Path: philabs!prls!pyramid!decwrl!labrea!agate!ucbvax!ucdavis!vega.ucdavis.edu!u546025938ea >From: u546025938ea@vega.ucdavis.edu (0040;0000009303;0;340;141;) Newsgroups: rec.ham-radio Subject: PRO-2004 modification Summary: 400 channel mod. Message-ID: <3476@ucdavis.ucdavis.edu> Date: 11 Jan 89 07:18:25 GMT Sender: uucp@ucdavis.ucdavis.edu Reply-To: u546025938ea@vega.ucdavis.edu (Steve Meyer) Organization: University of California, Davis Lines: 49 Due to the fact that several people have requested this information, I am posting the 400-channel mod. to the Radio Shack PRO-2004. This information was relayed to me by a friend in Los Angeles, who read it to me verbatim out of _Popular Communications_, Dec. 1988. Neither he (a PRO-2004 owner) nor I (not an owner) have tried this mod. Take the diode out of 513 (for cellular coverage) and, while observing polarity, replace in socket 510. NOTE: apparantly, on some PRO-2004's (not most) there is a jumper or solder jumper across the two D510 mounting holes. It is possible that this is on the other (bottom) side of the sub-assembly board. In any event the jumper, should it exist, must be carefully removed with a desoldering tool. Be sure to handle the sub-assembly board and cable connector CN-501 with TLC, since even the slightest damage or minor crack in the board will result in a scanner good for use as a boat anchor. LOCATION: the diode is located on PC-3, near restart switch SW-101 This modification will now provide the user with 400 channels of scanner memory. These will be divided into 10 banks of 40 channels, thus making the keypad notation inaccurate. This is the only operational effect the mod. has. OTHER DIODES OF INTEREST: D-510 400 channel mod. D-512 Installed on Australian/European versions D-513 Cellular lockout D-514 Supposedly increases scan rate above 16 channels/second D-515 In-factory install (?) I hope this helps, and good luck with it. 73, Steve N6QGG Steve Meyer, N6QGG Student, UC Davis Internet: smmeyer@ucdavis.edu Bitnet: smmeyer@ucdavis.BITNET UUCP: {ucbvax, lll-crg}!ucdavis!smmeyer Packet: n6qgg @ kg6xx-1 From philabs!prls!pyramid!decwrl!labrea!rutgers!rochester!pt.cs.cmu.edu!cadre!pitt!cisunx!chain Thu Jan 12 09:38:25 EST 1989 Article 8764 of rec.ham-radio: Path: philabs!prls!pyramid!decwrl!labrea!rutgers!rochester!pt.cs.cmu.edu!cadre!pitt!cisunx!chain >From: chain@cisunx.UUCP (Tom Link) Newsgroups: rec.ham-radio Subject: Re: PRO-2004 Mods Summary: summery of Mods with some added -- S-METER -- FASTER SCAN Message-ID: <14852@cisunx.UUCP> Date: 11 Jan 89 18:16:29 GMT References: <14816@cisunx.UUCP> Reply-To: chain@unix.cis.pittsburgh.edu (Tom Link) Organization: The Zets Lines: 84 In article <14816@cisunx.UUCP> chain@unix.cis.pittsburgh.edu (Tom Link) writes: >I read some other mods in other issues of Pop com and in 73 i'll >post the after i find them if nobody beats me to it Well, nobody beat me to 'em so I'm back here a list of the diode functions as printed in Aug 1988 edition of 73 by KB6LCN d-510 in circut - scanner will have 400 memories (10 x 40) not in circut - scanner will have 300 memories (10 x 30) d-512 in circuit - it will step 30 kHz from 825-844.995 and 870-889.995 removed - " " " 12.5 " " " " "a d-513 in circut - will not scan 825-844.995 MHz or 870-889.995 MHz removed - will scan all of 800 MHz band d-514 in circuit - scanning rate increases to 20 channels per second not in circut - scanning rate in 19 ch/sec (alt 8 ch/sec) !!!! WATCH POLARITY !!!! in Aug 1987 Popular Communications Bill Cheek gives the bet details to bring back the lost 800 MHz Freqs. and poinsts out that in the replaced bands the defalt skip rate for a search is 30 MHz however if change it with the step key you need to press the RESET key on the front keypad to return to 30 MHz increment step. (RESET is to to be confused with the RESTART button on the rear of the unit). he also gives modifications for an S-meter S-METER 1 - locate transister q-9 (far frount right area of the radio, just under the sloaping front panel. 2 - drill a 1/4" hole in the rear chassis of the radio 3 - install a RCA jack in this hole 4 - Install on lead of a .10-uF ceramic disc capacitor to the center lug of the RCA jack and the other lead to ground lug of the RCA jack 5 - clip off all but 1/4" of leads of a 10-K ohm resistor. Carefully, soder one lead to the collector (center lead) of q-9. !!! pretin all leads and use a low watt iron with sharp tip 6 - solder a 12" wire to the free end of the 10-K resistor. Slip a 1" section of insulated tubing over resistor and wire to prevent shorting. 7 - connect free end of the wire to the center lug of the RCA jack 8 - connect a voltmeter capable of reading between 1 and 3 volts, DC (digital or analog to a RCA plug. red wire to center, and black wire to the shell. shielding in not needed. connecting the rca jack and plug will now give you a measurement of the recievers intermediate frequency automatic gain control (IF AGC) the auther said the the range will be between + 1.87 volts DC with no signals present to +2.6 volts DC for a strong signal. he also suggested that a digital voltmeter with 2 or three decimal places gave better resolution. I ordered the scanner when Radio Shack's catalog announced it and got it as soon as it came in an etirnity later. I restored the lost 800 MHz freq about a year and a half ago and have not found any problems. I'll probable do the other mods this weekend. If any else knows mods let us know. 73 from a hopefully soon to be novist trying to study code -- | Tom Link, University of Pittsburgh Computer Science | BITNET: chain@pittunx | USENET: ...!pitt!cisunx!chain | ARPANET: chain%unix.cis.pittsburgh.edu@vb.cc.cmu.edu | CC-NET: chain::cisunx | UUCP: {decwrl!allegra,bellcore,cadre,psuvax1}!pitt!cisunx!tjw | AT&T: 1 (412) 731-6296 | US-MAIL : 310 Surrey Place, Pittsburgh PA 15235-5056, USA From philabs!linus!raybed2!ewb Mon Jan 16 09:04:26 EST 1989 Article 8822 of rec.ham-radio: Path: philabs!linus!raybed2!ewb >From: ewb@raybed2.UUCP (EUGENE BALINSKI) Newsgroups: rec.ham-radio Subject: PRO-2004 MODS HERE THEY ARE !!! Keywords: AGAIN ! Message-ID: <1255@raybed2.UUCP> Date: 12 Jan 89 14:34:39 GMT Organization: Raytheon Co., Bedford, Mass. Lines: 87 I guess it's time to post this article again. As always do these mods at your own risk. I assume no responsibility. 73 & good listening Gene WA1UXA In response to numerous inquiries I am posting a short overview of the mods to the Radio Shack PRO-2004 scanner. First, all mods are done at your own risk. I assume no responsibility. I do not know what effect they (the mods) will have on any warranty, however I would think they would probably void it. Also, one of the mods restores coverage of the cellular phone frequencies. It is ILLEGAL TO LISTEN TO CONVERSATIONS IN THIS BAND ! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Therefore my supplying info to you does NOT in any way constitute an invitation to break the law. You are on your own! These mods are detailed in the following articles: a) POPULAR COMMUNICATIONS AUG 87, PP 18-20 b) MONITORING TIMES OCT 87, P 53 c) MONITORING TIMES DEC 87,P 60 I suggest strongly that you obtain the back issues and read through the letters or articles. I also suggest you subscribe to the mags. They supply a lot of great info and freq lists. Now the mods. 1) Restoring 870 MHz coverage. First treat the radio as if it were CMOS, that is make sure you and it have no built up static charges. UNPLUG THE RADIO FROM THE AC OR DC POWER SOURCE AND ANTENNA !!!!!!!! Take the radio out of the case by removing the 4 screws on the back. Carefully invert the radio. Locate a box-like sub-circuit. It's near the switch marked "restart". The sub-circuit should be marked PC-3. Carefully pry off the cover of the metal box. Inside there will be a 64 pin dip IC. This is the radio CPU. Be careful not to touch or short out any leads on the chip. Near the chip there will be a row of diodes marked D-502 to D-515. If D-513 is present, cut one lead, separate it so they will not touch, and magic, 870 Mhz is restored. If D-513 is not there and you still do not have 870 coverage, then a little more work is in order. Locate the 9 pin connector "CN-501". Carefully remove it from the sub-circuit. Unscrew the screws holding PC-3 to the main chassis. Carefully invert the sub-circuit board (PC-3). Locate the one lone component on that side of the board. If it is a diode, as it should be, then cut one lead and separate them as above. Re-install the sub-circuit with the screws on to the main chassis. Reconnect the 9 pin connector. Do NOT put the cover back on just yet ?! 2&3) 400 CHANNEL and SPEED MOD ! On the top of the sub-circuit board, locate the slot for D-513. Count backwards from there until you get to the space for D-510. Install a diode at D-510 in the same polarity as the rest of the diodes. There, you now have 400 channels instead of 300 ! Now install a diode at D-514 and you have increased the scan speed to 20 channels/sec from 16 ch/sec. Carefully re- assemble the metal box. Make sure everything else is as it should be. RE-invert the radio so it is right side up. 4) THE SQUELCH MOD !! Now, locate a sub-circuit box under the sloping front panel. It should have many alignment holes in the top. Pry the cover off very carefully. Locate IC-2 in the left side of the pc board. It should be marked IC- 10420. Locate R-148, a 47 K ohm resistor between pins 12 and 13. Cut a lead of this resistor, But be sure to leave enough lead on both sides of the cut to solder to. Patch in a 100K ohm resistor. Make sure there are no solder balls or short circuits. Now your squelch will operate more smoothly. Again, I STRONGLY suggest you obtain the above mentioned magazines for more details. Addresses appear below. Please ignore any mis-spellings, mis grammer, etc. Good luck and good listening !!! 73 Gene WA1UXA PS, make sure you re-install the metal cover and re-install the radio in the case !!!!!!!!!!!!!!!!!! Addresses: Popular Communications 76 N Broadway Hicksville, NY. 11801 Monitoring Times 140 Dog Branch Rd P.O. Box 98 Brasstown, NC. 28902 Standard disclaimer applies !!!!!!!!!!!!!!!!!!! From philabs!prls!pyramid!amdahl!bnrmtv!brandt Sun Mar 19 14:02:03 EST 1989 Article 10444 of rec.ham-radio: Path: philabs!prls!pyramid!amdahl!bnrmtv!brandt >From: brandt@bnrmtv.UUCP (Adrian Brandt) Newsgroups: rec.ham-radio Subject: Re: Another PRO-2004 mods request Summary: Here are some Pro-2004 modifications Message-ID: <5101@bnrmtv.UUCP> Date: 16 Mar 89 18:45:27 GMT References: <15835@cup.portal.com> Organization: Bell Northern Research, Mtn. View, CA Lines: 51 In article <15835@cup.portal.com>, Jay@cup.portal.com (Jay M Novello) writes: > Since Radio Shack is discontinuing the PRO-2004 and cutting the price back > to $299.00, I'd like to make a request for somebody with the cellular > modification to this fine set in a text file to please post it. 1. Remove the 4 philips screws on the back of the unit that hold the case onto the chassis. 2. Slide the radio out of the case by pushing it out the front. Or, put another way, slide the case back, off the radio. 3. Once you've eased the radio out, turn it upside down with the front toward you. 4. Locate a board with "PC-3" stenciled on it in big white letters. It is roughly in the middle of the radio near the back. There is a rectangular, highly reflective (mirror-like) metal cover covering most of this board. 5. Gently remove this metal cover. It is held on by being press-fit over little metal dimples. A little careful prying will do the trick here. 6. Once the cover is off you should see the main CPU chip on the right, a resonator crystal (501-X I think?) in the rear right corner, and a vertical row of diodes to the left of the CPU chip. Some of diode positions will be lableled like this D-509, D-510, D-511, D-512, *D-513*, etc. I don't remember exactly which ones are labled or not, but that's not so important right now, you should get the idea. 7. The diode D-513 is labled (I know) and this is the beastie that disables the cellular phone frequencies and their 30KHz search step size. Snip this diode with diagonal cutters (or whatever). Make sure the snipped wire ends are not touching, and viola! You've got full 800MHz coverage on your Pro-2004. 8. You may want to test it at this point. (Try entering 880 MHz or some other previously disabled 800MHz frequency, and verify that you don't get an ERROR.) Re-assemble. PS: There is a TURBO-Scan mod where you can up the scan speed to around 30ch/s by replacing the resonator crystal in step 6 with a 10MHz version. Also, by soldering in a diode in what would be diode position D-510 (if it were labled) you can add 10 channels to each bank for a total of 400 ch. The problem with this is that then the keypad's labelling for channel banks becomes incorrect. You should get and verify the complete details on the mods in this "PS" because I can't supply you with complete instructions that I am 100% sure about on these. I'm just letting you know they're possible... From philabs!prls!pyramid!oliveb!ames!haven!purdue!iuvax!silver!commgrp Wed Mar 22 09:13:52 EST 1989 Article 10541 of rec.ham-radio: Path: philabs!prls!pyramid!oliveb!ames!haven!purdue!iuvax!silver!commgrp >From: commgrp@silver.bacs.indiana.edu Newsgroups: rec.ham-radio Subject: Re: Another PRO-2004 mods request Message-ID: <12600047@silver> Date: 21 Mar 89 20:48:00 GMT References: <15835@cup.portal.com> Organization: Indiana University CSCI, Bloomington Lines: 59 Nf-ID: #R:cup.portal.com:-1583500:silver:12600047:000:2495 Nf-From: silver.bacs.indiana.edu!commgrp Mar 21 15:48:00 1989 In article <15835@cup.portal.com>, Jay@cup.portal.com (Jay M Novello) requests PRO-2004 mods. [posted mods deleted] >There is a TURBO-Scan mod where you can up the scan speed to >around 30ch/s by replacing the resonator crystal in step 6 with a >10MHz version. previously posted by : ] Turbo scan for the 2004 ??? Yes !! Someone has realized that if you ] replace the present 7.37 MHz ceramic resonator CX501, with a 10.7 MHz ] ceramic resonator it really boosts the scan/search speed! The present ] resonator is soldered between pins 29 and 30 of the CPU (IC-503). ] Rumor has it that a 10.00 MHz computer xtal will work just fine. ] Note: The effect of the speed mod on weak signal performance is ] presently unknown. The resonator is for the CPU clock oscillator. Jacque KA9FJS confirms that the mod works with an ordinary 10 MHz computer crystal ($1 at hamfest) but reports a possibly-undesirable side effect: Increasing the clock rate _decreases_ the resume-scan delay time. Jacque says: "The manual says delay is 2 seconds; with mod, delay is <1 second. Painful if a channel is filled with slow responders." He reports no detection problems at the increased scan rate. >Also, by soldering a diode in... position D-510 (if it were labled) >you can add 10 channels to each bank for a total of 400 ch. The >problem with this is that then the keypad's labelling for channel >banks becomes incorrect... PRO2004 keyboard template for 400-channel modification, showing new channel-bank contents: +-----------+-----------+-----------+ | 1 | 2 | 3 | | | | | | 1 - 40 | 41 - 80 | 81 - 120 | +-----------+-----------+-----------+ | 4 | 5 | 6 | | | | | | 121 - 160 | 161 - 200 | 201 - 240 | +-----------+-----------+-----------+ | 7 | 8 | 9 | | | | | | 241 - 280 | 281 - 320 | 321 - 360 | +-----------+-----------+-----------+ | 0 | | | | | . | CLEAR | | 361 - 400 | | | +-----------+-----------+-----------+ -- Frank W9MKV @ K9IU reid@gold.bacs.indiana.edu {inuxc,rutgers,uunet!uiucdcs,pur-ee}!iuvax!silver!commgrp "Hams across the water, hams across the sky." From philabs!prls!pyramid!oliveb!apple!bloom-beacon!tut.cis.ohio-state.edu!ucbvax!ucsd!rutgers!att!ihuxz!parnass Mon Mar 27 09:43:31 EST 1989 Article 10629 of rec.ham-radio: Path: philabs!prls!pyramid!oliveb!apple!bloom-beacon!tut.cis.ohio-state.edu!ucbvax!ucsd!rutgers!att!ihuxz!parnass >From: parnass@ihuxz.ATT.COM (Bob Parnass, AJ9S) Newsgroups: rec.ham-radio Subject: A carrier operated light for the PRO-2004 [repost] Message-ID: <4265@ihuxz.ATT.COM> Date: 25 Mar 89 12:33:46 GMT Organization: AT&T Bell Laboratories - Naperville, Illinois Lines: 91 Several PRO-2004 owners have asked for a repost of this article: x-------------- CUT HERE --------------------------------------x A CARRIER OPERATED LIGHT FOR THE PRO-2004 SCANNER by Bob Parnass, AJ9S The July 1988 issue of Monitoring Times suggested that it may be easy to add an S-meter to the Radio ShackO PRO- 2004 scanner: "...But adding an "S" meter is even easier than previ- ously thought. Pin 10 on the IF amplifier (IC1) is an "S" meter output. With the proper bridge or meter buffer/amplifier an "S" meter is reality...." Brace yourself for disappointment - the integrated cir- cuit mentioned in the article is used for WBFM only. Despite the internal IC block diagram in the service manual, pin 10 on my PRO-2004 is useful as an S-meter output only when the radio is in the WBFM mode. Between pin 10 and ground, I placed a 10,000 ohm resistor in series with a 250 microamp meter for a simple test setup. The meter read full scale on strong signals. With no signal at all, the meter read about 70% of full scale. When the mode is set to AM or NBFM, the meter was always at zero. One could add a bridge circuit here, but this metering point is of limited utility. Add a Light Instead With a room full of functioning scanners, it's difficult to determine quickly which radio is "talking." I use separate external speakers on each radio, and the spatial separation helps. In addition to "hearing" which radio is active, I like to "see" which radio is active, and carrier operated lights are effective at providing such visual cues. The idea is to illuminate a lamp when a signal opens the squelch. A small yellow light emitting diode (LED, another Bell Labs invention) is well suited to this purpose. The following modification works well on all PRO-2004 modes. To add a COR light to the PRO-2004, make use of the "scan control" pin (pin 13) on IC2, the TK10420 IC. Pin 13 has voltage present only when a signal is detected. This chip contains the IF, detector, limiter, and squelch cir- cuitry for NBFM. If you tremble with an electric drill in your hands, read no further. The LED can be mounted in a small hole drilled through the plastic front panel, just to the right of the headphone jack. Electronically, the circuit is simple. The voltage at pin 13 is not enough to drive the LED directly, so a gen- eral purpose NPN transistor (e.g., a 2N2222) can be used as a solid state switch. - Pin 13 of IC2 is connected to the transistor base through a 10,000 ohm resistor. - The emitter is grounded. - The collector is connected through a 1000 ohm resis- tor to one end of an LED. This resistor limits the LED current to about 13 milliamps. - The other end of the LED is connected to one contact on the rear of the PRO-2004's on/off, volume con- trol. This furnishes about 14 VDC unregulated to the circuit. The back of the on/off switch has two contacts. Use the one with the brown wire connected to it, as this contact is only "live" when the scanner is turned on. I mounted the 2 resistors and transistor on a small PC board, which I fastened to the PRO-2004 chassis using a metal standoff. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Bob Parnass AJ9S, AT&T Bell Laboratories - att!ihuxz!parnass - (312)979-5414