| Author |
Message |
    
Fdirsh
| | Posted on Tuesday, November 05, 2002 - 10:46 am: | 
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Does anybody know where I can get the 1251 chip to modify this radio for 11 meters. Or is there any other way to do it.
Thanks. |
Barefoot
| | Posted on Tuesday, November 05, 2002 - 1:02 pm: |
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Chipswitch is the best way to go |
Bulldog
| | Posted on Tuesday, November 05, 2002 - 1:23 pm: |
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Get a CHIPSWITCH for it. Also get the socket for the chip. Had one in my 2600 sorry I got rid of it!
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Fdirsh
| | Posted on Tuesday, November 05, 2002 - 1:53 pm: |
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where can I locate the parts to do this?
thanks again. |
Deadly Eyes
| | Posted on Tuesday, November 05, 2002 - 8:54 pm: |
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You do not need the chip...
go to the site below. Click the Uniden button. Then click your model radio on the lists of radios as shown on the left side of the screen. You will see several nice modifiers.
http://www.mods.dk/
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2600
| | Posted on Tuesday, November 05, 2002 - 11:11 pm: |
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Hmmm, "Increasing transmit power", "Clarifier Mod", and "Alignment Instructions". That's the wole list I found there for the 2600. Any info on doing what Fdirsh wants is totally absent from mods.dk. Since nobody has uncovered a way to get more bands from the CPU chip the radio is built with, it's what I would expect. If Uniden had not removed all such capability from the 2600 CPU chip, he wouldn't be asking this question. The Chipswitch is STILL the only way I have EVER heard of. I'm still waiting for someone to describe a simpler method. In the 2510 it was possible to remove the 22 MHz crystal and substitute a 20 MHz for it. This would not change the display, it would still read 28-29.7. The actual coverage of the radio would now be 26-27.7. You just had to do the math in your head, reading the displayed frequency. I have never tried this in a HR2600. If the PLL is more or less the same as the 2510, it should work, in theory.
That's the best I know to suggest.
73 |
deadlyeyes
| | Posted on Wednesday, November 06, 2002 - 7:33 am: |
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Re 2600...
If you will check the list under the 2600 you will see the 5th and 7th one from the top as being freq modifications. |
2600
| | Posted on Friday, November 08, 2002 - 1:23 am: |
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How very annoying. mods.dk is broke worse than last night. His "Uniden" button at at the top of his home page was broke last night and tonight. The "search" did work last night. That was how I got to the three items ONLY that I mentioned above. I just figured I had missed something, like the fifth and seventh (of three?) items for the 2600. Now his search button is broke. Type any search string, even put it inside quotes and now it says "You have to type something". Sounds like someone is still learning PHP, maybe? Better him than me. I have found some good stuff there before. I hope he gets it fixed soon.
73 |
chris759
| | Posted on Friday, November 08, 2002 - 7:57 am: |
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looking for tech 307 if you could give me some info on hr2600 finals change. have one just modified i would like to replace the finals i am told my final is weak but they want too much to replace it with mrf497 .i am a good friend of 396 jimmy in nyc he told me you may be able to help .thanks chris759 |
307
| | Posted on Saturday, November 09, 2002 - 7:21 am: |
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Hi Chris , Define "weak". Normal transistors in an HR-2510 are MRF-477 and there are several drop in replacements. Typically an HR-2510 puts out about 30 watts , I have seen some higher but the average is 30. What is yours putting out on Sideband?
307 |
Chris759
| | Posted on Saturday, November 09, 2002 - 11:05 am: |
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hi 307 between 10-12 im told dont now for sure never put it on a meter |
Chris759
| | Posted on Saturday, November 09, 2002 - 11:10 am: |
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i was told its leaky(from a tech) the guy i got it from said he hardly used it it is very clean so i believed him |
2600
| | Posted on Saturday, November 09, 2002 - 2:53 pm: |
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About the frequency expansion mod on www.mods.dk .His site will work one time, then give me a "404" the next. I did look at the suggested mod. Pins 34 and 35 DID fail to produce the result on three of the HR-2600 that I tried. If someone had a radio that was different, noting the numbers on the CPU chip would be the place to start. The guy on mods.dk who says it works DOESN'T say that he saw it work with his own two eyes.
The type number on the "Non-modifiable" HR-2600 CPU chip is "UC-1251" I still have it, left over from a Chipswitch install. I'm a witness that THAT chip would not modify. If someone knows the exact numbering marked on a MODIFIABLE 2600 CPU, I would love to see THAT information posted. It would save the wasted effort of trying it on a 'locked out' chip. The comments under the directions at mods.dk are two votes against, one for the argument that the 2510 mod (pins 34&35) WILL work. I guess it must have worked for someone, but I'm not one of them, and I actually tried it on three radios before deciding that Uniden really had changed the CPU chip.
For all I know, Uniden made them one way first, and another way later. The EXACT numbering found on the 64-pin CPU chip should tell you which is which, but NOBODY seems to have THAT information. Manufacturers routinely make "production changes" while they are producing a radio. Making absolute statements that ALL HR2600 radios will be a particular way is a little simple-minded, if you have only seen one of them. Uniden did in fact produce "NON-MODIFIABLE" versions of the HR2510, just before production was discontinued. The CPU chip on those was marked "UC-1250A". I was dumb enough to order some from Uniden, thinking they would sell me the modifiable version. No such luck. They sold me the 10-meter-only one with the "A" suffix. If you see the number "UC1249", you should be good to go, even if it has the "A" letter suffix.
73 |
ss8541
| | Posted on Saturday, November 09, 2002 - 9:13 pm: |
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haha 2600, you fell for the 1250a chip(just playing). i found it weird that only a 'substitute'(1250a) was available when i called for a replacement. i asked around b4 i bit on that deal from uniden. the 1250a is the only chip that they have in stock. just fyi, for those that may need a cpu chip replacement in the future.
i have never seen a modifiable 2600cpu, but then i haven't been doing this as many years as others out there. the chipswitch is all that is available for modifications. that is unless someone has a new stock modifiable chip laying around. i would not suggest buying a used chip since these are very easily damaged by excessive heat during removal and/or esd(electro-static discharge).
oh, i have heard that some of the newer lincolns are coming with non-modifiable chips. |
HoosierCardinal
| | Posted on Saturday, November 09, 2002 - 8:02 pm: |
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my 2600 has the 1250 chip already installed and cover well above and below the reg 40. Cool radio though. Talks good on AM but it ROCKS on SSB!!!! |
307
| | Posted on Saturday, November 09, 2002 - 10:02 pm: |
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I have a problem relating to "weak". It most likely needs an alignment. Typically the MRF-477 dies , it never goes "weak", at least I have never seen one.
307 |
2600
| | Posted on Sunday, November 10, 2002 - 12:45 am: |
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Hey Richard, the hilarious part is the date on my stock label for the '1250A -- 1992. Once I found out what it was, I had to wonder if I would live long enough to see somebody who needed one (a reliable part, really) AND who was happy with 10m ONLY. I did use one of them 7 or 8 years back, with the 20 MHz crystal swap to resurrect a radio that had died during someone's mod attempt. An ungrounded soldering iron/grounded radio job, I think. I should probably save this one for the Smithsonian, I suppose. Nobody else would want it.
73 |
Chris759
| | Posted on Thursday, November 14, 2002 - 7:40 am: |
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307 can you email me i just received the 2600 back i think it needs an alignment.chris759 my email radioman759@yahoo.com |
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