President Lincoln lincmods mods HR 2510.pdf

PRESIDENT LINCOLN (HR 2510) MODS

by Roger Perales

http://www.gj.net/~perales

Conversion of this text from html format to PDF by Frank Tomeš

http://come.to/329RC106

Radio Modification Information

This site is provided for the sharing of information for educational purposes only. The use of this

information may void your radios warranty, The modification of your radio may make its use illegal.

The owners of this page DO NOT warranty any of this information, nor accept any responsibility of

how you use its content.

www.president.com

If you have any Questions or Comments, you can E-Mail me at peralesr@gj.net

Jestli máte n jaké dotazy nebo p ipomínky, pošlete mi e-mail na tomes@kps.zcu.cz

nebo na f.tomes@atlas.cz

Table of Contents

To convert the HR2510 to 11 Meter operation: ....................................................................................... 4

To convert the Lincoln to 11 Meter operation: ....................................................................................... 5

HR2510 Modification for increased MicGain .......................................................................................... 6

President or Uniden HR-2510 Variable Power Modification ................................................................. 7

Increasing the power output for the HR2510 ........................................................................................... 8

Modification of the HR2510 Mic buttons to operate the VFO ............................................................. 10

MOD # 1 ........................................................................................................................................ 10

MOD # 2 ........................................................................................................................................ 11

Talkback Removal..................................................................................................................................... 13

MOD #1 - The Relay Approach .................................................................................................. 13

MOD #2 - The Solid State Approach I ....................................................................................... 14

MOD #3 - The Solid State Approach II ...................................................................................... 15

HR2510 RIT / Clarifier Mods ................................................................................................................. 16

RIT MOD I ................................................................................................................................... 16

RIT MOD II .................................................................................................................................. 16

RIT MOD III ................................................................................................................................ 16

RIT MOD IV ................................................................................................................................. 17

HR2510 Misc. Enhancements. ................................................................................................................. 18

Increasing the Receive Audio I .................................................................................................... 18

Increasing the Receive Audio II .................................................................................................. 18

Increasing the Receive Audio III ................................................................................................ 18

Mute circuit improvement ........................................................................................................... 18

Roger Beep Mods .......................................................................................................................... 18

Adding an external meter to the HR2510 .................................................................................. 19

If you are really interested, I suggest trying the CHIPSWITCH. ....................................................... 20

24 MHZ Broadband instructions for your HR2510 .............................................................................. 21

MOD #1 ......................................................................................................................................... 21

MOD #2 A simpler method... ....................................................................................................... 22

HR2510 Alignment Instructions - (Taken from the Uniden Service Manual) ................................... 23

Alignment of P.L.L. and Carrier Oscillator Portion ................................................................. 23

Alignment of Transmitter Portion .............................................................................................. 24

Alignment of Receiver Portion .................................................................................................... 26

HR2510 Alignment and Test Point Layout ............................................................................................ 27

Synthesizer / Microprocessor / PLL PCB ................................................................................... 27

Main PCB....................................................................................................................................... 27

HR2510 Circuit Block Diagram............................................................................................................... 29

Microphone wiring .................................................................................................................................... 29

Some interesting e-mails ........................................................................................................................... 31

Subject: Re: Kterou stanici vybrat ? .................................................................................. 31

Subject: Re: Lincoln mods homepage ................................................................................ 32

Subject: Mirror..................................................................................................................... 32

To convert the HR2510 to 11 Meter operation:

Remove the cover on the speaker side of the radio. You will need to loosen the 4 screws (2 on each side)

that secure the SYNTH PCB Frame to the chassi. - You do not need to remove these screws - You need

to remove the 4 screws that secure the SYNTH PCB to the metal frame.

Now flip the SYNTH PCB over, Locate the pins of the Microprocessor. In some versions of the HR2510

there may be Grey Epoxy covering one end of the Microprocessor. You may be able to peel the epoxy

right off to expose the pins of the IC. If it is not soft enough to peel off, you can use a 400W hair dryer

to heat the epoxy enough to remove it.

Cut the ground trace connected to pins 34 & 35, jump pins 34 & 35 to the free end of Resistor pack

RR301 (see diagram) or connect a 4.5K -15K ohm resistor from pins 34 & 35 to pin 3 of IC312 (5V

regulator).

This will give complete coverage from 26.000 MHz to 29.699 MHz (Some radios will go to 29.999

MHz)

To convert the Lincoln to 11 Meter operation:

Remove the cover on the speaker side of the radio..

Locate the the Microprocessor on the SYNTH PCB.

Tie a jumper wire from the thru plate via hole at the end of the trace the bare end of the 10K ohm

Resistor. (see diagram) or connect pins 34 & 35 together..

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