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HR2600.MOD
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1980-01-01
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HR2600.1
AFTER HOOKING UP MY HR-2600 TO MY PK-232, I FOUND I HAD SOME PROBLEMS USING
IT IN AMTOR. SINCE I LOVE TO MODIFY AND "FIX" RIGS, I GRABBED MY TEST
EQUIPMENT AND SET OUT TO FIND OUT WHY THERE WAS A LONG SWITCH-OVER DELAY TIME.
AFTER A FEW MINUTES, I FOUND OUT THAT THE RECIEVER WAS COMMING UP OK. IT WAS
THE MUTE CIRCUT THAT WAS SLOW. I FOUND TWO CAPACITORS THAT WERE RESPONSIBLE
FOR THE DELAY IN THE MUTE CIRCUT.
TO FIX THE PROBLEM, CHANGE OUT C74 AND C99 (BOTH ARE 4.7uf @ 50VDC) WITH .01uf
DISC CAPACITORS WITH A VOLTAGE RATING GREATER THAN 15VDC. THESE CAPACITORS ARE
ALSO FOUND IN THE HR-2510 AS WELL. THESE SEEM TO BE C139 AND C99 IN THE HR-2510
IF MY COPY IS RIGHT.
THESE CAPACITORS ARE LOCATED NEXT TO THE AUDIO OUTPUT IC (TDA1905) IN THE
RADIO. THIS I.C. IS LISTED AS IC2 IN THE HR-2600 AND IC103 IN THE HR-2510.
I ALSO FOUND THE S/RF METER TO BE VERY SLOW IN MY RIG. I FIXED THIS BY CHANGING
C302 ON THE CONTROL UNIT (LOCATED NEXT TO J304) TO A .01uf DISC CAPACITOR ALSO.
THIS CAPACITOR IS ALSO IN THE HR-2510.
AFTER THESE MODIFICATIONS, I HAD NO MORE PROBLEMS MAKING ANY CONNECTS IN ANY
MODE.
73'S AND ENJOY THE UNIDEN!
CRAIG/N7ETV @ WB6MQM
LAS VEGAS, NEVADA. 89121
addendum:
this mod files talks abount changing some caps (namely c99 4.7uf) to .01 uf
i tired this on my 2510 and it did speed up Tx to Rx delay real well but...
it messed up CW at speeds 0-17 wpm.... made it chopy... but worked ok
at high speeds.... i tacked on a .1uf cap to c99 (the .01uf the mod called for)
this fixed up CW and seems to still work good for packet.)
so you might want to append this info to that mod file.
de kc6tdh brad @ n6reb.#nocal
also im looking for a hr2510 mod file that will let me 'unmod' the xrit
back to a 'rit' if you know of any info on this.... thanks brad
HR2600
A reliable source recently informed me that the new Uniden HR-2600 10M. rig
may be modified for "expanded" frequency coverage using the same technique as
is done for it's predecessor, the HR-2510. (Pins 34 & 35 of the cpu lifted
from ground and tied to vcc/5v via a 10K resistor on the foil side of the pcb)
This area of the board is sealed in epoxy and very careful work with a x-acto
knife is required or you will lift the traces off the board along with the
epoxy. Freq coverage will be the same as for the 2510.
NOTE: THE SYSOP OF THE PBBS, NOR THE ORIGINATOR IS RESOPNSIBLE FOR ANY T
TEHNICAL DAMAGE OR LIABILITY TO ANY RADIO TO WHICH THE ABOVE PROCEDURE
IS PERFORMED. THE USER/OPERATOR ASSUMES ALL LEGAL RESPONSIBILITY
OF THE SAME AS WELL. (IN SHORT, STICK WITH 10 METERS...)
GEORGE, WA2RCB.
Signed: WA2RCB @ N3FOA.Philadelphia Pa.19134. (George).
HR2600.2
Date: Sat, 24 Nov 90 22:55:50 EDT
From: kd2bd@nn2z.nj.usa.na
Message-Id: <13461@nn2z.nj.usa.na>
To: all@allbbs
Subject: Uniden HR2600 on VHF/UHF
Hello Folks!
I recently purchased a Uniden HR2600 and a Microwave Modules MMT 144/28
2-meter linear transverter and got both interfaced and working well.
The HR2600 has an output power of 25 watts PEP on SSB, CW and 10 watts on
AM and FM. The transverter requires only 0.25 to 25 mW of 28 MHz drive for
proper operation. In an effort to reduce the HR2600 output level to the
level required by the transverter, I removed PB-100, a small double-sided
copper coated circuit board located under the top cover that supplies +Vcc
to the driver and final amplifier stages. I then soldered a jumper between
TP2 and TP4, the outermost prongs that hold PB-100 in place.
This action provides the HR2600 driver with full +Vcc, but removes +Vcc
from the MRF 477 final power amplifier. There is more than enough driver
energy fed through the final to excite the transverter in this configuration.
I've received good signal and audio reports from all the locals when using
the transverter and the HR2600 with this simple modification. I believe this
modification could make the HR2600 useable with other transverters as well.
73 and Good DX! de John, KD2BD