World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/mods/radioshk/pro2004.doc

Text File | 1997-02-01 | 14KB | 335 lines

Date: 12 Jan 89 14:34:39 GMT
From: pyramid!prls!philabs!linus!raybed2![e-mail]  (EUGENE BALINSKI)
Subject: PRO-2004 MODS  HERE THEY ARE !!!

    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 !!!!!!!!!!!!!!!!!!!

------------------------------

Date: 11 Jan 89 07:18:25 GMT
From: vega.ucdavis.edu![e-mail]  (0040;0000009303;0;340;
Subject: PRO-2004 modification

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: [e-mail]
Bitnet: [e-mail]
UUCP: {ucbvax, lll-crg}!ucdavis!smmeyer
Packet: n6qgg @ kg6xx-1

------------------------------

Date: 11 Jan 89 18:16:29 GMT
From: pitt!cisunx![e-mail]  (Tom Link)
Subject: PRO-2004 Mods

In article <[e-mail]> [e-mail] (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

    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: [e-mail]
| CC-NET: chain::cisunx
| UUCP: {decwrl!allegra,bellcore,cadre,psuvax1}!pitt!cisunx!tjw
| AT&T: 1 [phone]
| US-MAIL : 310 Surrey Place, Pittsburgh PA 15235-5056, USA

------------------------------
Date: Thu, 5 Jan 89 10:16:00 EST
From: Mark Bramwell 519 661-3714 <julian!business.uwo.ca![e-mail]>
Subject: pro 2004 mods

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.

------------------------------

Date: 8 Jan 89 02:30:51 GMT
From: vega.ucdavis.edu![e-mail]  (0040;0000009724;0;340;
Subject: PRO-2004 Mods

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: [e-mail]
Bitnet: [e-mail]
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   :-)
------------------------------

Date: 8 Jan 89 04:22:52 GMT
From: att!ihuxz![e-mail]  (Bob Parnass, AJ9S)
Subject: pro 2004 mods [ref. to PRO-34 scanner review]

In article <[e-mail]>, [e-mail] (Brian M. Perkin) writes
> I just noticed last night that Radio Shack now offers
> a handheld scanner that has 800 Mhz. coverage. Does anyone
> know if it has a similar modification? ..the model was the PRO-34..

December 1988 "Monitoring Times" reviews the PRO-34 and
details its modification.  I cannot provide reprints, but
they are available from:

    Grove Enterprises
    140 Dog Branch Rd.
    Brasstown, NC 28902

           1988 "Monitoring Times" Scanner Reviews
_____________________________________________________________
February    Uniden/Bearcat 100XLT
March       Uniden/Bearcat 760/950XLT
May         Uniden/Bearcat 200/205XLT
June        Metrowest base charger for 100/200/205XLT
July        Regency Informant 1 and 2
August      AOR 800, Antenna Specialists MON52 mobile antenna
September   Cobra SR-15
November    AOR 900
December    Radio Shack PRO-34

Most of these reviews were written by Larry Wiland.

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bob Parnass AJ9S,  AT&T Bell Laboratories  -  att!ihuxz!parnass - [phone]