hr2510 help

[HACK1729]

Hi, finally decided to log in because I need help identifying a couple mods in a 2510 I just got. I found them when tracking down issues it has.
#1,NB doesn't seen to work on ssb
#2, RF gain does not seem to work any mode
#3, up/down buttons do not work incrementally like the vfo,eg. up jumps up 5khz, down jumps down 15 khz from there they jumps 10khz in their respective directions.
The mod doen't look like those shown on websites. I'll try to download pix of the mods.. Thanks for any help
Image won't post

[Bombero]

......Image won't post

Hey HACK1729...

You'll be able to post pics when you have acquired the required amount of legit posts.

Bombero

[HACK1729]

Okay, so the #1 NB, I don't see any obvious wires comming from the back of the pc120 behind the rfg knob and the nb button accept I do see two epty hthrough holes with solder) there is a pair of wires coming out of the center appear to be attached to the RIT pot and goes to a couple through holes in the rear main board next to vr103

-- Sunday, 14 December 2014, 8:52 AM --

#3, The mod is differnt from all I have seen elsewhere. It has the cut trace that grounds the 34, 35 pins of the ic315, but instead of a jump from 34,35 to vacant resister space on rr303. This mod ties a resister from 34,35 to a sm resister under the chip(315).
Then there is another mod is, cut trace to 3rd leg of l301, a diode bridges from that leg (l301) to copper coil next to it. ????Never seen that one refered to anywhere.

[MDYoungblood]

Hello HACK1729,
Welcome to the forum. Here is a site with quite a few 2510 mods along with 2600, Lincoln, and the RS HTX-100, you will probably find one that matches your radio, [Please login or register to view this link] . There are several ad popups so don't be surprised.

3's

Greg

[HACK1729]

Thanks Greg, I've been to every conceivable mod site for hrs and not found what I am seeing. Rogerbird was kind enough to chat with me about it. Seem whoever did the mods on this one used different means to atcheive the same things. The RFgain was used to do a am veriable output which I have little use for, and no effect on ssb. The up/down buttons are functioning as intened, I just expected they should work as the vfo like on the RCIs. I'll do the mod for up/downs at a later date.
So this was was a learning experience for this radio.
Thanks again for the responce and welcome. Hack

[TheCBDoctor]

Thanks Greg, I've been to every conceivable mod site for hrs and not found what I am seeing. Rogerbird was kind enough to chat with me about it. Seem whoever did the mods on this one used different means to atcheive the same things. The RFgain was used to do a am veriable output which I have little use for, and no effect on ssb. The up/down buttons are functioning as intened, I just expected they should work as the vfo like on the RCIs. I'll do the mod for up/downs at a later date.
So this was was a learning experience for this radio.
Thanks again for the responce and welcome. Hack

Good morning HACK1729,

Welcome to the forum, There are a number of different ways to do the 11 meter band conversion. As long as it works you should leave it as is. As for the RF gain being used to adjust the carrier you should restore the AM power adjustment back to factory. Too much carrier may cause the Final to pop, which will be hard to replace. The MRF-477 was discontinued long ago. There is no benefit to adjusting the AM power; it has no affect on the radio's peak power. Since there is no carrier on SSB the AM carrier adjustment is disabled on SSB. The carrier should be set for no more than 4 watts. The radio is capable of doing 25 watts peak power. The adjustment for SSB and AM peak power is clearly marked on the board.

To find where the RF gain wires go I would assume whoever did the mod cut the wires from the main board and added wire to reach the AM carrier adjustment. If you remove the added wire, and use the existing factory wire to determine length, you should find exactly where the factory wires are by the color coded RF gain wires. They are only a few inches from the RF gain control. I doubt whoever did the mod removed the factory wires because it is a pain to get behind the RF gain control.

Here is a link to some photos and info on the HR-2510. I need to update the info, but the right top photo will show you where the AM power adjustment is. It would be the potentiometer in the far rear left corner near the audio chip, and right next to the large electrolytic capacitor. I don't recall what the value of the pot is. I don't have an HR-2510 in front of me at this moment, but I do have a Lincoln, which should be marked the same. The AM power is VR-103; If it is missing replace it and set the carrier to 4 watts. The peak adjustment for SSB is VR-104 and is marked ALC; it is just above VR-103. The AM peak power is in the middle of the board and is marked AMC VR-114. The legal limit is 12 watts, but it can be adjusted for 25 watts peak as long as the carrier is set no more than 4 watts. The ALC (SSB) can be adjusted for 25 watts as well.

[Please login or register to view this link]

The Lincoln does not have an RF gain control. The Lincoln has a power adjustment where the RF gain control is on the HR-2510. This is what the mod you have does; it converts the RF gain control on the HR-2510 to what is found on the Lincoln. What is nice about the HR-2510 is that the adjustments not only are clearly marked, but they also say what the control is and does.

The HR-2510 is the best 10 meter radio ever made in my book, which was designed to be easily converted to 11 meters. The first generation went from 26.0000 MHz to 29.9999 MHz. The second and third generation stops at 29.6999 MHz. That is why the FCC put a stop to the HR-2510 by forcing the company to use a Microprocessor that cannot be converted. In the final days of its manufacturing many of the distributors sold the non-convertible units with the UC-2501A Microprocessor. This is the 64 pin chip mounted on a dual sided clad board. That is where the conversion for 11 meters is made. Removing this IC requires some patience, experience and a solder-sucker tool. Using solder wick will not work and will destroy the copper clad traces.

When Chip Switch was still around many operators had this aftermarket Microprocessor installed so the radio could be used for duplex transmission as well as simplex. It also when up to 30MHz.

Good luck and thanks for keeping as many of the older radios in service as possible. In my humble opinion all the new radios made in Malaysia and China are junk. The last Uniden made was April 1994 in the Philippines.

Respectfully,

[davew41]

I am looking for the sideband modulation vr, I have everything else from the resources I was able to find online except this one
I am trying to get it properly adjusted with the two tone test on sideband
I found listing for all the Vr's except sideband modulation
thanks in advance

[MDYoungblood]

There isn’t a adjustment for SSB modulation, adjust VR114 (AMC) to achieve maximum modulation then adjust VR104 (ALC) for SSB power.

3’s

Greg

[davew41]

There is no ssb modulation adjustment by itself..... on a 2510 as I found out from the man Rogerbird

The SSB ALC is the adjustment for SSB Power - VR104 this adjusts the POWER does not change the wave
That is all that can be adjusted for SSB output.
You can press the MIc Gain button to Cut audio by 10db during transmit.

hr2510
set deadkey with VR107 while in AM mode this is for only the am dead key
am power 103 cw am fm this sets the base dead key for all modes.
am mod 114
ssb power 104 The SSB ALC is the adjustment for SSB Power - VR104
ssb mod NONE it used vr104
VR-105 FM Modulation