Search found 36 matches

by KC7NOA
Monday 19th Mar 2012, 15:28
Forum: CB Radio Repair and Troubleshooting
Topic: scarce?
Replies: 5
Views: 4880

Re: scarce?

That's ok .... its an AM radio anyways .... it works, just no display ... think i'll use it for parts ....
by KC7NOA
Sunday 1st Jan 2012, 21:25
Forum: CB Radio Repair and Troubleshooting
Topic: Uniden HR2510 Intermittent Transmit
Replies: 1
Views: 2163

Re: Uniden HR2510 Intermittent Transmit

Looks like X301 or the transistor near it ....
by KC7NOA
Thursday 15th Dec 2011, 8:29
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

So ... might be a 2sc2814f5 on the underside of the cpu board -.. Q308.

Im getting closer ... its hard to determine what's the root cause of the intermittent oscillation...
by KC7NOA
Tuesday 13th Dec 2011, 3:42
Forum: CB Radio Repair and Troubleshooting
Topic: scarce?
Replies: 5
Views: 4880

scarce?

Radio Make and Model: Sears Roadtalker 40 PCB Number: PLL Number: Test gear available: Symptoms: no display What is working: every thing else What has been tried: compared to another Did it suddenly happen ?: unknown Anything else that may be of help?: just looking for schematic.... or common proble...
by KC7NOA
Friday 9th Dec 2011, 14:04
Forum: CB Radio Amplifiers
Topic: palomar tx75 3-30mhz
Replies: 1
Views: 2312

Re: palomar tx75 3-30mhz

Any luck?
by KC7NOA
Friday 9th Dec 2011, 14:01
Forum: CB Radio Amplifiers
Topic: palomar tx 75
Replies: 3
Views: 7383

Re: palomar tx 75

This is an old thread ...

But just bought one with a pair of CD2545'S installed ... looks original...

Two watt drive keys 45watts ....

Probably replace the output transformer with something longer and a pair of mrf454's ...
by KC7NOA
Monday 5th Dec 2011, 17:47
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Any tips on trouble shooting the PLL0305A
.. so I don't haft to hold the pcb out?
by KC7NOA
Saturday 3rd Dec 2011, 16:23
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Also
.. almost every time I touch pin 17 of the pll0305A makes it work practically every time.
by KC7NOA
Saturday 3rd Dec 2011, 15:47
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Ok .... Iv got display frequency now ... still random tx/Rx .... The "locked" output pin of the pll030A is low during this occurance .... but since the display shows frequency that must mean that the MCU and resonator is functioning. Seems that pulling plug on connector 301 brings it back up -to usu...
by KC7NOA
Saturday 3rd Dec 2011, 14:50
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln LCD
Replies: 2
Views: 2449

Re: hr2510 president Lincoln LCD

Hey otter ... you wrote some code for the Lincoln for picMicro?
by KC7NOA
Friday 2nd Dec 2011, 18:23
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln LCD
Replies: 2
Views: 2449

hr2510 president Lincoln LCD

Radio Make and Model: ht2510/lincoln
PCB Number:
PLL Number:
Test gear available:
Symptoms: no lcd

What is working: lcd

What has been tried: lcd

Did it suddenly happen ?:
Anything else that may be of help?: ok, skip

Im just wondering if the HR2510 and the Lincoln used the same exact lcd?
by KC7NOA
Thursday 1st Dec 2011, 13:23
Forum: CB Radio Repair and Troubleshooting
Topic: 2995dx issue
Replies: 5
Views: 4620

Re: 2995dx issue

Good deal ... hope radio was cheap! !!
by KC7NOA
Thursday 1st Dec 2011, 8:00
Forum: CB Radio Modifications
Topic: lincoln HR2510 MRF455 pcb
Replies: 3
Views: 5221

Re: lincoln HR2510 MRF455 pcb

Ok ... ill go that route .... it seemed that the thermal bias diode is.in the way big time ...
by KC7NOA
Wednesday 30th Nov 2011, 14:36
Forum: CB Radio Repair and Troubleshooting
Topic: 2995dx issue
Replies: 5
Views: 4620

Re: 2995dx issue

If not bought new ... sounds like Rf getting into the displays Vcc .... supply voltage ....

There is an amp on that thing right? Disable the amp and see if it still does it.
by KC7NOA
Wednesday 30th Nov 2011, 14:31
Forum: CB Radio Modifications
Topic: Cobra 29 LTD FM mods?? Stumper of the century?
Replies: 6
Views: 7455

Re: Cobra 29 LTD FM mods.

It is easy to add FM to most radios using a 455 KHz IF. You just need a 455 Mod-demod module which can be obtained from Spectrum Communications http://www.spectrumcomms.co.uk/cbkits.htm#FM455 If you have any trouble, obtaining one from Spectrum, let me know as I think I still have one in stock. Sti...
by KC7NOA
Monday 28th Nov 2011, 17:27
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Well ... looks to be about 5v and I can't measure the pulse time .... but its long enough for me to see it ... id guess its almost 1/2 second.

Should/will pll0305a output lock be high without serial data sent to it?
by KC7NOA
Monday 28th Nov 2011, 10:37
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Ok will check that .... connector 301when pulled and reseated .....even tilted so that 13vI is pulsed usually get it going .... but its not the connector contacts .... let's hope for a short reset.. On a side note .... I seem to have lost one of the screws to the finals/driver .... any one know the ...
by KC7NOA
Friday 25th Nov 2011, 19:21
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Hope iv found my intermittent Tx/Rx on turn on .... found a solder splash between pins 5&6 of the PLL0305A Ic .... still no display (frequency ) ....
by KC7NOA
Tuesday 22nd Nov 2011, 4:35
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

I would hope it was writer in C or C++ ..... then its some what easy modifying it to current production Mu's ..... the hard part would be making the first prototype pcb to fit where the old MCU is now ..... I might try to tackle this problem in the future .... MCU's with lots more power and flash m...
by KC7NOA
Sunday 20th Nov 2011, 3:43
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

I would hope it was writer in C or C++ ..... then its some what easy modifying it to current production Mu's ..... the hard part would be making the first prototype pcb to fit where the old MCU is now ..... I might try to tackle this problem in the future .... MCU's with lots more power and flash me...
by KC7NOA
Friday 18th Nov 2011, 3:06
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Think hard .... the radio shop local to me went out of business at the beginning of the last solar minimum .... they did some but everything's gone to the scrap heap years ago...
by KC7NOA
Thursday 17th Nov 2011, 15:50
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Just dawned on me to check Y301 .... probably ok ,but ....
by KC7NOA
Thursday 17th Nov 2011, 14:34
Forum: CB Radio Repair and Troubleshooting
Topic: hr2510 president Lincoln CPU
Replies: 26
Views: 14568

Re: hr2510 president Lincoln CPU

Not really ... iv noticed that when it will not Tx .... the Tx out from the MCU is not functional .... and its not actually receiving anything.. ... also display is still dead - have a line on a replacement, just no source for any possible MCU ... Really wish the guys that made the chipswitch would ...
by KC7NOA
Thursday 17th Nov 2011, 5:59
Forum: CB Radio Repair and Troubleshooting
Topic: Deaf President George
Replies: 14
Views: 7968

Re: Deaf President George

Doesn't seem like your getting much help so I'll throw my thoughts in....

I would start by bypassing the lowpass filter and inject signal to the first stage ... try to devide and conquer ...
by KC7NOA
Wednesday 16th Nov 2011, 6:51
Forum: CB Radio Modifications
Topic: lincoln HR2510 MRF455 pcb
Replies: 3
Views: 5221

lincoln HR2510 MRF455 pcb

Well I just got my 2510 up and working -.. poof I smoked a Mrf497 - god im a fool ... I know darn well my match is bad around 26.965!!!

Where to get the pcb for useing an mrf455??

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