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HR2510.MOD
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1980-01-01
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HR2510
FREQUENCY MODIFICATION: PRESIDENT/UNIDEN HR-2510:
The 10-meter mobile amateur transceiver will transmit and receive from 26.000
MHz to 29.9999 MHz when the following modifications are performed:
1) Locate the CPU: IC 315 (UC-1201).
2) Pin 34 and 35 are together grounded (see the bottom - solder side). Cut the
PCB Pattern to disconnect the pins 34 and 35 from ground. Now, both pins are
free from ground and floating.
3) To activate 26.000 to 27.999 MHz (pin 35) and 29.7 to 29.999 MHz (pin 34),
just add 10 K ohms, 1/4W resistor between the pattern of pin 34 and 35 to the
pattern of DC+5V line.
NOTE: The display will indicate the EXACT 40 CB CHANNELS (Yes sir!) when "G"
band is selected.
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POWER OUTPUT MODIFICATION: HR-2510 and Realistic HTX-100.
Transmitter power output of these rigs can be increased up to 100 Watt (SSB),
when an easy modification/tune up is done. Complete details can be found in
73 AMATEUR RADIO, september 1989, p. 48
Daniel VE2BAP @ VE2CSC.PQ.CAN.NA
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HR2510.1
For those of you who are using a Uniden 2510 for packet, you can speed up
AGC speed considerably, just by removing the AGC SSB switch transistor Q-111
This transistor switches the AGC off for CW operation, and on for SSB operation
All I did was remove it and my radio now works with very good speed on 10m
You may put a sitch between the pad that was for collector and ground. When
you want slow AGC switch is ON pulling line to ground. for fast agc turn switch
off leaving line floating.
That is all there is to it. Those who have the Uniden 2600 may find that the
AGC is same for this radio. Look for NJM2902 IC this is the AGC amp, you wil
find a transistor connected thru a RC network, to pin 12 of said ic. Remove
The description of the mod for the 2510 should work for this radio also. Would
apreciate if someone would test and tell!
Ciao de Chuck ti3djt @ ti0paq.cri.na