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From: aa617@cleveland.Freenet.Edu (Scott Berringer)
Newsgroups: freenet.rec.scanner.reviews
Subject: PRO-46 review
Posted-By: xx192 (aa617 - Scott Berringer)
Date: Sat Feb 20 11:46:16 1993


From: parnass@cbnewse.cb.att.com (Bob Parnass, AJ9S)
Subject: new PRO-46 portable scanner -- rcvs cellular phone signals
Date: Sat Feb 20 09:51:12 1993


The brand  new  Radio  Shack  PRO-46  portable  scanner  excludes
coverage  of  cellular phone *frequencies*.  It looks like a Uniden
creation (downsized and distant 200xlt relative powered by  4  AA
cells),  and  as  I  pointed  out to the salesman, cellular phone
images were loud and clear above 897 MHz.

Since the PRO-46 is a Uniden, the images fell above the  cellular
phone  band  instead  of  below,  as in the models made for Radio
Shack by GRE.

As I posted at the start, FCC  regs  to  prohibit  scanners  with
cellular  phone  coverage  will  either  be  ineffective  against
scanners prone to images (e.g. PRO-46), or force manufacturers to
use high first IFs in all their radios (e.g. PRO-2006, PRO-43).

Radio  Shack  could  comply  with  the  FCC's  intent  by  ending
frequency  coverage  at  869  MHz  in  their lower priced models.
Those models would then be unusable for listening in the 929  and
935 MHz bands :-(
--
==============================================================================
Bob Parnass, AJ9S  -  AT&T Bell Labs  -  parnass@ihlpm.att.com - (708)979-5414

--
Scott Berringer                                  _**_
SigOp: Radio Scanner SIG                        /____:-IIIIIIIIIIII
aa617@cleveland.Freenet.Edu                   >: 911 :-------------\
Scanner enthusiasts do it with frequency..     +-(O)----------(O)--+

--
Hear the news AS IT HAPPENS. Become a Radio Scanner Monitor.
For more information, e-mail:
aa617@po.cwru.edu, aa667@po.cwru.edu or, xx192@po.cwru.edu
Scanner Enthusiasts do it with Frequency...
-------------------------------

From: aj234@cleveland.Freenet.Edu (Dave Woolard)
Newsgroups: freenet.rec.scanner.reviews
Subject: Pro 46
Posted-By: xx192 (aa617 - Scott Berringer)
Date: Wed Oct  6 10:18:02 1993


***

The Pro 46 uses tiny surface mount technology so you must have the
correct soldering equipment to be able to do these mods. (DO NOT
ATTEMPT IT WITH A SOLDERING GUN!)

Disassemble as follows:
Remove antenna, battery cover and battery pack.
Remove 2 screws in the back and 2 more in the battery compartment.
The two halfs separate with a firm but careful prise.
There are two major circuit boards attached with a 18 pin header.
The keyboard interface PCB is fixed to one half of the case and
the main PCB with all the RF stuff wants to stay attached to the
other half of the case.

Both modifications require you to modify the keyboard PCB.
This is the PCB which is attached to the keypad part of the
case (leave it attached). It has the micro processor on it and has a
copper RF shield covering it. Remove the shield exposing the microprocessor.
Looking at the board with the speaker at the bottom, the microprocessor
is the black chip about 5/8 inch square. If you are holding the circuit
board correctly, the bottom left hand corner of the chip should have a small
45 degrees notch.

To restore cellular. Remove R227 which is a surface mount resistor
(actually it's a 0 ohm jumper) located 3/4 inch to the right and 5/16 inch
down from the bottom right corner of the microprocessor chip. Connect a 47k
resistor 1/10 watt (smallest you can buy!) between the now vacant left
hand pad of the removed component to the 3/8 inch long vertical track
3/16 inch to the the left of and 3/16 inch down from the removed R227.

I recommend that you do not attempt to modify the VHF Low coverage as
it does not really gain you anything (TV sound is about it) and you
lose 30 to 50 MHZ.
Changing the VHF Low scan coverage for the PLL is as easy as removing R226
(another 0 ohm jumper) located 1/4 inch below where R227 was and installing
another 47k resistor from the left hand pad of R226 (just removed) to the
same vertical track that you soldered the other resistor to.

This will usually get you sound from the local TV station but the RF alignment
needed to properly tune the new frequncy limits involve changing the values
of two molded inductors (inductance not known) and capacitor C062 from 330pf
to 68pf. These mods are on the main RF board and should only be attempted by
a knowlegable tech with all the proper equipment. You run a great risk of
completely screwing up the alignment of the scanner by bending a 800 MHz
loop inductor or tweaking the wrong tweaker! Be warned!!

After reassembling the scanner you will need to reset it by holding down
the '2' and '9' keys while switching it on before it will recognise the
new scan ranges.
***
 * SLMR 2.1a * VA, DC, MD Scanner Info since 1991-Fido/Usenet/WME




--
"Death, Taxes, and Democrats will always be with us, at least Death never
gets any worse" ... A Wise Man......
Why doesn't Clinton have the courage to call his plan what it really is?
"Socialism"

--
Hear the news AS IT HAPPENS. Become a Radio Scanner Monitor.
For more information, e-mail:
aa617@po.cwru.edu, aa667@po.cwru.edu or, xx192@po.cwru.edu
Scanner Enthusiasts do it with Frequency...
-------------------------------

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