From: discipiow@woods.ulowell.edu
Subject: Re: Uniden HR2600 mod?
Organization: University of Lowell
Date: Sun, 22 Nov 1992 05:45:07 GMT

In article <27890034@hpsad.sad.hp.com>, frankb@hpsad.sad.hp.com (Frank Ball) writes:
> From: randall@informix.com (Randall Rhea)
> Date-Received: Thu, 19 Nov 1992 16:20:10 GMT
> Subject: Uniden HR2600 mod?
> Newsgroups: rec.radio.amateur.misc
> Keywords: uniden 2600 hr2600 modification
> 
> *I have checked FTP and other sources, and have not found
> *a modification for the Uniden HR2600 10m rig that will extend
> *its frequency coverage.  I would like to be able to receive
> *CB while out on the road.  (I am not interested in transmitting
> *on CB.)  I have found mods for power output and packet work,
> *but not for frequency extension.
> 
> *The latest volume (vol. 5) of the Artsci Radio/Tech Modifications
> *book says that "you must replace the microprocessor."  I have
> *no idea where I can get the replacement part or how much it would
> *be, nor does it look easy to solder a new microprocessor into the rig.
> 
> *Randall Rhea                                        Informix Software, Inc. 
> *Project Manager, MIS Sales/Marketing Systems    uunet!pyramid!infmx!randall
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> 
> The new microprocesser is available from Copper Electronics.
> 
> "The Chipswitch is a custom microcomputer integrated circuit designed to
> replace the existing UNIDEN microcomputer chip is these radios:  The UNIDEN
> HR2510, HR2600, and Lincoln.  This item adds many more features than original
> factory chip.
> 
> The Chipswitch #600-00250 $69.99
> Socket 64 pins #600-00250 $8.99  one of these catalog numbers must be wrong.
> 
> Prices are cash prices, add 3.75% for credit card
> 
> 1-800-626-6343
> 
> I have never used this part, nor do I know anyone who has.  I have heard
> that it will tune the radio from 12 meters to over 30 MHz.
> 
> Frank Ball   1UR-M          frankb@hpsad.sad.hp.com
> Hewlett Packard             (707) 794-4168 work, (707) 538-3693 home
> 1212 Valley House Drive     (707) 794-3844 fax, IT175, XT350, Seca 750
> Rohnert Park CA 94928-4999  KC6WUG, LAW, AMA, Dod #7566, I'm the NRA.
-- 
The CHIPSWITCH is advertized in "73 Amateur Radio Today" every month.  This
month (December), the ad can be found on page 54.  The replacement processor
is available from Chipswitch, Santa Rosa, CA, (710) 539-0512, for $59.95.  No
surcharge for credit card purchase.

I've had the thing in my 2600 for about a year now and am quite happy with
the mod.  The only problem with the modification is that you must replace
a 64 pin ic without damaging the printed circuit board.  The instructions
are quite detailed, but it does still take some skill to replace the chip.

Without retuning my radio, I was able to increase the RX/TX range from
28-29.7 Mhz to appx 24.5-30 Mhz.  Below 24.5 the PLL doesn't lock.
Initally the mod was suposed to give 15m coverage, but a realatively strong
harmonic and some strong words from thRRL persuaded chipswitch to
withdraw availabilty of 15m coverege.  

The best thing about the replacement processor is the added functionality
of the radio.  A variable offset is possible.  30 memory channels are
available.  The neatest feature is that you can change the tuning increment
right from the buttons on the microphone, thus, eliminating the need to
fiddle with radio buttons while driving.  They did think of a lot, including
channelizing the cb portion of the spectrum, i.e., the correct "channel" number
appears along side the frequency.

Anyway, I feel that the mod is definately worth 60 bucks simply for the
added features which make the radio easier to use.  Have extended 
frequency coverage is just icing on the cake.

wcij@n0ary.#nocal.ca.usa.na
discipiow@willow.ulowell.edu