HR2510 Mods

This page describes how to expand the coverage down to 24 Mhz !!

This works for all models.


HR 2510 Model (models using the UC-1201A CPU)


Locate X302, remove and put a crystal switch in its place, put the crystal that was removed (X302) on to the crystal switch's pcb, you need to obtain a 20 Mhz crystal and put this on to the second position on the crystal switch, when all is done you will need to retune your frequencies, tune for the old frequency bands first using the adjustments on the crystal switch's pcb, then switch to the new frequency range and adjust the trimmer to tune the new frequencies.

With the new crystal enabled these will be the actual operating frequencies

When the display shows 26.000 MHz it will be on 24.000 MHz.
When the display shows 28.000 MHz it will be on 26.000 MHz.
When the display shows 29.699 MHz it will be on 27.699 MHz.
(these assume that you have already done the IC mods to get down to 26Mhz, otherwise it will be the same as the lincoln/HR 2600 models)

MAKE SURE THAT THE CRYSTAL SWITCH IS WIRED CORRECTLY INTO THE SET'S PCB, ONE OF THE SWITCH'S OUTPUT'S MUST BE GROUNDED AND THIS SHOULD GO TO THE GROUNDED SIDE OF THE CRYSTAL'S OLD LOCATION, FAILURE TO DO THIS MAY PREVENT THE SET FROM WORKING CORRECTLY.


LINCOLN and HR2600 Models



To change the frequency band from 28.000 - 29.699MHz to 26.000 - 27.699MHz.
Replace X-tal X302 with 20.000MHz X-tal.
When the display shows 28.000 MHz it will be on 26.000 MHz.
When the display shows 29.699 MHz it will be on 27.699 MHz.

To change the frequency band from 28.000 - 29.699MHz to 24.000 - 25.699MHz.
Replace X-tal X302 with 18.000MHz X-tal.
When the display shows 28.000 MHz it will be on 24.000 MHz.
When the display shows 29.699 MHz it will be on 25.699 MHz.
You could also use the same method as the HR 2510 by using a crystal switch


BandPassFilter Adjustment

To broad band your radio after mod or adding the ChipSwitch, it`s nessesarry to add a capacitor (220pF) across C26. (From right side of L307 (TP306) to ground.)
AdjustmentDescription
L310High Band Adjustment
L319Low Band Adjustment
Connect Oscilloscope to Output Terminal for VCO.
Adjust L310 for maximum at Highest Band.
Adjust L319 for maximum at Lowest Band.


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