From: CRAIG/N7ETV
Subject: UNIDEN QSK MODIFICATION
I just received this note on packet. It might be of interest to those who own
Uniden 10-meter transceivers and wish to use them on packet and/or AMTOR:
Msg# TSP Size To
15362 PY 1569 KD2BD N7ETV 901130 1711
>Subject: UNIDEN QSK MODIFICATION
Thanks!!! to Craig, N7ETV for the following info...I will copy this to all
of you who responded to my message.
Mike/KA3NVP
HELLO:
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 COMM-
ING 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 PROB-
LEM, CHANGE OUT C74 AND C99 (BOTH ARE 4.7uf
ACITORS 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
LAS VEGAS, NEVADA. 89121
NN2Z>
73, de John, KD2BD
--
John A. Magliacane FAX :(908) 747-7107
Electronics Technology Department AMPR :KD2BD
Brookdale Community College UUCP :...!rutgers!ka2qhd!kd2bd
Lincroft, NJ 07738 USA VOICE:(908) 842-1900 ext 607
SOURCE: The QRZ Windows Ham Radio CDROM
