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.
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 ................................
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... .......................................................................................
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.
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..
HR2510 Modification for increased MicGain This mod will increase the AM modulation. The AM modulation adjustment is VR114, which is marked >AMC= on the main circuit board. To get more, Q114 is the Mic Attenuator, This limits the audio. Q114 is located near the front of the circuit board in the center to the left of IC 104, above C153. To modify this, remove Q114 and bend the Emmitter leg up from the circuit board and re install. Put a 1000 ohm resistor in the vacant hole and solder to the board.
President or Uniden HR-2510 Variable Power Modification The HR-2510 does not have a varible output power feature as it comes from the manufacturer. The following modification will allow you to fix that oversight.
Increasing the power output for the HR2510 1). Remove the top and bottom covers. 2). Locate and remove Q132 & Q134. 3). Replace Q134 with an ECG 340 or TCG340. WARNING!!! The leads of the two transistors are exactly opposite of each other. [ 2SC2086 = BCE ; ECG340 = ECB.] 4). Replace Q132 with an MRF 497. ( Be sure to use heat sink compound.) 5). Remove C132. (no replacement) 6) Remove C112 & C116. 7). Replace C112 with an 82pf capacitor, But put the new Capacitor on the bottom of the PC board. 8).
With the radio on USB, Adjust VR112 for 80mA +/- 5mA on the DC Ammeter. After the adjustment is complete, Reinstall the B002(PB-100) jumper board. ] 10). inject a two tone signal into the microphone of the radio while transmitting into a dummy load. Set VR104 (ALC) for maximum output.. Retune VR107 ( AM /FM carrier level) for Maximum. Retune VR103(CW carrier level) for Maximum 11). Again inject a two tone signal into the microphone of the radio while transmitting into a dummy load.
Modification of the HR2510 Mic buttons to operate the VFO Note:This modification is not needed if you have Chipswitched your radio already. The Chipswitch does this internally. What these mods do is to disconnect the 5Khz steps and allow the Mic buttons to do what the Rotary switch does. MOD # 1 The rotary switch applies 5 volts to activate the Up or Down control of the VFO.The Mic uses ground to activate the 5 Khz step control of the Up or Down buttons.
NOTE: If the Up / Down buttons work backwards, exchange the Orange and Brown wires. MOD # 2 Mod #2 is the same principal as Mod #1, But uses a Solid State approach, and does not require rewiring of the Microphone. This Mod also allows for an automatic frequency increase or decrease as long as you hold the button down. The rotary switch applies 5 volts to activate the Up or Down control of the VFO.The Mic uses ground to activate the 5 Khz step control of the Up or Down buttons.
3. Connect the output wire from the Isolation resistor on pin 11 of the 4001 CMOS IC to the top trace on the frequency knob. (the white wire). 4. Connect the output wire from the Isolation resistor on pin 10 of the 4001 CMOS IC to the 2nd trace from the top trace on the frequency knob. (the grey wire). 5. Connect the power wire to the 5 volt regulator pin 3 (facing the front of the radio, the far right leg of the L78MO5CV, located in the middle of the microprocessor circuit board). [see diagram] 6.
Talkback Removal MOD #1 - The Relay Approach One method of Talkback removal is to break the speaker line with a relay. Parts needed : 12Volt SPDT relay 2 - 1N4148 Diodes 1 - 1N 4001 Diode Several pieces of hookup wire Jumper the Relay coil - K1 with a 1N4001 Diode - D1. To key the relay you connect one side of the Relay coil (the side with the Cathode of the diode) to IC107 pin 1.(HA17808W) Cut the Blue wire that goes to pin 1 of the AUX plug on the rear of the radio.
MOD #2 - The Solid State Approach I All that is needed is to add a 1N914 Diode from pin 6 of IC103 to the collector of Q125. Connect the cathode of the diode to pin 6 of IC103, and the anode to the collector (the center pin) of Q125.
MOD #3 - The Solid State Approach II All that is needed is to add a 1N914 or a 1N4148 Diode connected to a 10k to 100k resistor from pin 6 of IC103 to the Base of Q127. Connect the anode of the diode to one side of the resistor. Connect the other side of the resistor to pin 6 of IC103, and the cathode to the Base of Q127. Note: Use a 10k ohm resistor if you only use the internal speaker. Use a 100k ohm resistor if you use an external speaker.
HR2510 RIT / Clarifier Mods The RIT (Receiver Incremental Tuning) on the HR2510 is a Clarifier control to help >tune in= usually SSB signals that may be transmitted off of center. The RIT only works on the receiver. The HR2510 does not allow >slide= on transmit unless its modified. Many people wish to >Open= the RIT (or Clarifier). Everyone has a different mod for this one, I will list the ones I know.
Connect a Frequency counter to TP304. Adjust L318 for 38.695Mhz Connect a frequency counter to TP1. Set the Mode switch to USB, adjust L116 for 10.6975Mhz. Set the Mode switch to LSB, adjust L118 for 10.6925Mhz Set the Mode switch to CW, adjust L117 for 10.6950Mhz Check RIT range. It should be +/- 4Khz RIT MOD IV Find the orange wire comming from the RIT/RF GAIN PCB (PB-120).
HR2510 Misc. Enhancements. Increasing the Receive Audio I The HR2510 does not have a by-passed emmiter in the audio circuit. To correct this, Add a 4.7uf 16v Electrolytic capacitor across (in Parallel) with R152 (a 560 ohm resistor). This modification will increase the receive audio. Increasing the Receive Audio II This mod will increase the AM reception: Replace the AM Detector diodes (D111 & D112) with better Schottky Barrier diodes. You can use ECG 583 or NTE 583 diodes or 1N6263 or equilvalent.
Adding an external meter to the HR2510 To add a needle type meter all you need to do is connect it to C302 on the Microprocessor.
If you are really interested, I suggest trying the CHIPSWITCH. It gives you : 1) 30 memory channels, with temporary channel lockout and repeater offsets. 2) Extended frequrncy covreage - 24.800 to 29.999 Mhz. 3) Programmable Scan/Seek functions. Scan-This allows you to set a range of frequencys in any band, and even set the hold time during scans. Seek-This causes the radio to seek for active channels. both features are programmable from 5khz or 10 Khz steps. 4) Programmable channel up and down buttons.
24 MHZ Broadband instructions for your HR2510 These instructions are to broadband your radio if you have the 24.000Mhz mod or the ChipSwitch installed. MOD #1 1. Take the four screws out of the speaker cover on the radio. 2. With the radio upside down and the PLL board facing you, Remove the four screws in each corner of the pll board. 3. Loosen the four screws on the sides of the radio that hold the PLL tray in the radio. Loosen them all the way before they come completely out. 4.
MOD #2 A simpler method... Here is a simpler method of increasing the VCO coverage on the HR2510. If your HR2510 is Chipswitched, but doesn't lock on 12 Meters, this mod will take care of the problem without having to access the underside of the synth PCB. Remove the four screws from the bottom cover and remove the cover. On the PLL board locate L307 (TP306). Install a small ceramic capacitor between the long lead of L307 and ground. Any value between 180 and 220 picofarad (pf) will do.
HR2510 Alignment Instructions - (Taken from the Uniden Service Manual) Alignment of P.L.L. and Carrier Oscillator Portion 1. Test equipment required: DC Power supply (13.8V) DC Voltmeter Dummy Load (50 Ohm) Frequency Counter Oscilloscope 2. Preperation for Alignment: PA SW : Off Mode SW : AM RIT : Middle Position TX SW : Off 3. Alignment Procedure: 1 Preset to: Adjust ment Remarks Mode : RX, AM L315 Connect an oscilloscope to TP306. SG : 28MHz 2 Ditto Adjust L315 For 6.
Alignment of Transmitter Portion 1. Test equiptment required: DC Power supply (13.8V) more than 10A AF S.S.G. AM FM (1kHz, 500Hz and 2400Hz) RF VTVM Oscilloscope DC Ammeter RF Power Meter AF VTVM Dummy Load (50 Ohm) FM Linear Detector 2. Preperation for Alignment: VR112 : Clockwise PA SW : Off VR113 : Counter Clockwise Meter SW : RF VR103 : Clockwise MicGain SW : Off SWR/CAL : Middle Position TX SW : Off Freq. : 28.000 MHz 3.
4 30 mV Mod. VR104 Adjust VR104 for 32.5V reading on the RF VTVM. 5 Ditto VR106 Adjust VR106 so that the carrier leakage at USB and LSB becomes minimum and almost equal. 6 Mode: CW VR103 Connect a SW between Pin 8 and 9 of the ACC connector. No Mod. 7 Mode: AM With the SW turned on, adjust VR103 for 21W reading on the Power meter. VR107 Adjust VR107 for 10W reading on the RF power meter. No Mod. 8 Ditto VR117 Adjust VR117 so that "9" LCD just lights on.
Alignment of Receiver Portion 1. Test equiptment required: AF VTVM DC Power supply (13.8V) Oscilloscope Dummy Load (50 Ohm) S.S.G. AM FM (28.000MHz, 1KHz, 30% Mod. and 50 Ohm Impedance) 2. Preperation for Alignment: NB SW : Off Mode : AM PA SW : Off Squelch : Min. (Auto SQ Off) Beep SW : Off RF Gain : MAX VOLUME : MAX TX SW : Off RIT : Middle position 3.
HR2510 Alignment and Test Point Layout Refer to the HR2510 Alignment instructions (The colors correspond to the adjustment procedure) Synthesizer / Microprocessor / PLL PCB 28
Main PCB 29
HR2510 Circuit Block Diagram Microphone wiring 30
Some interesting e-mails From: Tomas Laska To: "Radioamaterske forum" Subject: Re: Kterou stanici vybrat ? Date sent: Fri, 15 Aug 1997 12:28:54 +0200 Send reply to: "Radioamaterske forum" Organization: SATURN-TOYA Ltd.
selektivitu, citlivost, potlaceni AM a zrcadla. shogun je na tom o neco lepe (provedli nejaka vylepseni). linkos je trochu sirsi a tudis mene vhodny pro provoz na CB pasmu v FM. tyhle stanice jsou obvodove predurcene pro SSB. da se znich vyzdimat pres 30W. Bohuzel dost trpi na koncovy stupen - taky dost zere a topi. Pokud chces excelentni stanici pro provoz na CB a SSB (nedostizna selektivita, dvojciny koncak atd...
From: Self To: peralesr@gj.net Subject: Re: Lincoln mods homepage Date sent: Sat, 11 Apr 1998 11:08:47 +0100 Hi Roger, you wrote: > I would not mind if you wish to Mirror my site. If you need any help with the files, let me know. > Are you going to try to translate it into Czech? That would be interesting! Yes, I want to translate this pages into Czech. It can very help to our local Lincoln`s users.
