Uniden HR2510

This radio can be expanded to cover 26-30 Mhz without the need to realign!

Find IC315(UC1201A,UC1170,UC1250a etc) on the synthesizer board PB121BB.Then locate
pins 34 and 35 on that chip, these pins are grounded on the HR2510. But on the European models
like the President Lincon they are tied high(+5 Vdc).

Therefore to get the extended coverage needed these pins should be tied high.This can be done in the
following way.

On the solder side of the synth board pins 34 & 35 are grounded by the same trace. With a razor
blade cut this ground trace.

Now find resistor pack RR301.The left pin of this pack is unused and goes to a solder pad. Now
connect a small jumper wire between this solder pad and pins 34 & 35 on IC315.

Now you should get coverage from 26.000 Mhz to 29.990 Mhz in the following banks.

Band A: 28.000 to 28.490 Mhz
Band B: 28.500 to 28.900 Mhz
Band C: 29.000 to 29.490 Mhz
Band D: 29.500 to 29.990 Mhz
Band E: 26.000 to 26.490 Mhz
Band F: 26.500 to 26.490 Mhz
Band G: 26.965 to 27.405 Mhz
Band H: 27.000 to 27.490 Mhz
Band I: 27.500 to 27.990 Mhz



73 Steve KB9HGI