Search found 82 matches

by absorbentgnome
Friday 18th Mar 2011, 22:13
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 6720

Re: President Lincoln control buttons not working

Changed CPU over, all working now :) Method used for desoldering: IC removal done with hot air station at about 330oC for each side of the chip, levering it out slowly from either side. A lot of heat, time and patience is needed to get the board up to temperature to weaken or melt the solder for a s...
by absorbentgnome
Saturday 12th Mar 2011, 4:27
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 6720

Re: President Lincoln control buttons not working

Hi Scott Thanks for your reply. The resistor array checks OK. When the CPU comes I'll post back here if it fixed it or not. Soldering on the CPU looks absolutely perfect, no bad joints, board is in immaculate condition with no corrosion. On your advice, I will check the thru holes associated with th...
by absorbentgnome
Tuesday 8th Mar 2011, 2:15
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 6720

Re: President Lincoln control buttons not working

Thanks for your help zodiac, have tested between known good transceiver and this one and have come to the conclusion that the processor is damaged.
Hopefully a replacement will be on its way soon.
Dan.
by absorbentgnome
Saturday 5th Mar 2011, 21:54
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 6720

Re: President Lincoln control buttons not working

Ok thanks Zodiac :)
There are solder marks on those components, so it probably has been done before.
Have you seen inoperable front panel buttons before?
Dan.
by absorbentgnome
Saturday 5th Mar 2011, 9:00
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 6720

President Lincoln control buttons not working

Radio Make and Model: President Lincoln PCB Number: PLL Number: Test gear available: Multimeter, scope, counter, sig gen Symptoms: No response from band, channel, indicator buttons. What is working: TX ok when keying mic. Frequency dial OK. What has been tried: Checked operation of buttons and row a...
by absorbentgnome
Thursday 20th Nov 2008, 10:09
Forum: CB Radio Repair and Troubleshooting
Topic: Subject: Test Your Knowledge (President Lincoln/HR2510).
Replies: 35
Views: 16872

Subject: Test Your Knowledge (President Lincoln/HR2510).

Brilliant thread, well done Pioneer621 for finding the problem!
by absorbentgnome
Thursday 2nd Oct 2008, 8:51
Forum: CB Radio Repair and Troubleshooting
Topic: Watson W30AM Power Supply
Replies: 10
Views: 7240

I just repaired one of these recently. The construction of it is really a pain in the arse.

Don't suppose anyone has an ammeter out of one of these?
by absorbentgnome
Saturday 13th Sep 2008, 1:14
Forum: Wanted !
Topic: Ammeter for Manson EP925/Palstar PS30
Replies: 0
Views: 1594

Ammeter for Manson EP925/Palstar PS30

I'm looking for an ammeter panel meter from a Manson EP925/Palstar PS30 power supply. Can anyone help?
Sadly the original meter has been damage beyond repair.
by absorbentgnome
Wednesday 27th Aug 2008, 20:48
Forum: CB Radio Modifications
Topic: Have an idea for my Uniden 510.
Replies: 21
Views: 16880

I just recently re-worked one of my pro-510s. I installed variable power,along with several other mods..The radio now,will dead key anywhere from 0 to 5 watt dead key and swing up to 20. Radio checks are all great.Loud clean audio. Everyone thinks i am talking on a connex or galaxy. changed final t...
by absorbentgnome
Tuesday 19th Aug 2008, 23:59
Forum: CB Radio Modifications
Topic: Cobra 29 ltd Mod or Linear ?
Replies: 2
Views: 3797

Hi sinstp First check the loudness of your modulation on another cb, and note how you are most probably not bleeding over onto adjacent channels at the moment and the audio is clean. If the cb you are listening on has poor filtering and you are getting bleedover then get someone further away to chec...
by absorbentgnome
Monday 18th Aug 2008, 8:49
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

Re: 850

http://n6tr.jzap.com/850repair.html 1 of many? Indeed - I have replaced a number of caps on this rig. Luckily, someone else had already replaced the caps on the CAR board before much damage to the pcb was done. (its the one with the early DDS chips - got my fingers crossed for these ones!) I think ...
by absorbentgnome
Monday 18th Aug 2008, 3:18
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

The problem does seem better now. The cap C124 is across the 6V supply in the MC3357P circuit. Has anyone seen any effects of this cap drying out on a MC3357? Since its across the supply rather than in the functional part of the circuit I would have thought that it could have lost a lot of capacitan...
by absorbentgnome
Sunday 17th Aug 2008, 22:50
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

Replaced cap C124 (underside was swollen and had reduced from 22uF to 15uF) on IF board and hoped for the best. Took a while for the problem to show itself but it was still there. So I connected up my other kenwood with an antenna switch so I could definately check the problem was still there. Surpr...
by absorbentgnome
Wednesday 6th Aug 2008, 0:20
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

Checked the receiver under low noise conditions and its fine. A further problem has surfaced though - in FM receive mode, the AGC seems unstable. The signal fades and returns in an oscillating manner which is slow, then speeds up then slows down again. This affects signals around the S9 level and be...
by absorbentgnome
Friday 1st Aug 2008, 1:50
Forum: CB Radio Modifications
Topic: Have an idea for my Uniden 510.
Replies: 21
Views: 16880

Heh good post Dennis. I am in no way suggesting that experimentation with your radio is wrong. After all getting in there and modifying/uprating/improving sucessfully proves that you've understood the circuit design and used the theory to calculate new values for the appropriate components. The OP s...
by absorbentgnome
Thursday 31st Jul 2008, 22:12
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

Re: Question about receive quality on a TS850.

Ok thanks for the information Rick. I'm going out into the wilderness this weekend so I'm going to take the TS850 and a few other rigs and compare the sensitivity and quality in a low noise environment. It may not have a problem. It maybe worth checking VFO input on Gate G1 of Q9, as I remember you ...
by absorbentgnome
Wednesday 30th Jul 2008, 8:04
Forum: CB Radio Modifications
Topic: Have an idea for my Uniden 510.
Replies: 21
Views: 16880

I've never understood why you would want to swap around the finals in a radio just to gain an extra watt or so. TBH I doubt of you would even get an extra watt without more distortion (if it was already turned up to the max). Surely its better to run the radio within spec so you don't overheat the f...
by absorbentgnome
Wednesday 30th Jul 2008, 7:53
Forum: CB Radio Repair and Troubleshooting
Topic: Question about receive quality on a TS850
Replies: 8
Views: 4728

Question about receive quality on a TS850

When I compare the SSB audio quality between my Icom 735 and my TS850, the TS850 seems more susceptible to noise. The 735 just sounds better and seems to reject the noise more. The audio tone is turned down on the 735 but there just seems like there is much more noise on the TS850 for that to accoun...
by absorbentgnome
Thursday 10th Jul 2008, 1:10
Forum: CB Radio Repair and Troubleshooting
Topic: Maycom EM-27 flashing channel digits
Replies: 11
Views: 7619

Hi Rick, its been a little while! Hope things are ok with you :) Been really busy with new job here so there hasn't been much time for fiddling with radios :( John - If you google the varicap part number (KDV251S) that is on the circuit diagram you should be able to get a datasheet for it. It is fro...
by absorbentgnome
Wednesday 9th Jul 2008, 1:48
Forum: CB Radio Repair and Troubleshooting
Topic: Maycom EM-27 flashing channel digits
Replies: 11
Views: 7619

Hi there intercept The channel display flashes if the PLL is unlocked. The PLL is at the bottom left corner of the main PCB with the radio facing towards you. The varicap diodes can sometimes fail causing this, I had a Maycom that would not lock on the lower channels until they were replaced, thanks...
by absorbentgnome
Saturday 10th Nov 2007, 7:38
Forum: Tech Area
Topic: Windows woe
Replies: 2
Views: 4708

Never used a Mac, apart from the old 68000 ones. I used to love computers, I had an old Acorn Archimedes with an ARM RISC processor which was awesome for programming and doing 'cool stuff' Computers now tire me a bit, becuase of the power and resources they have and how they're wasted to give a user...
by absorbentgnome
Wednesday 31st Oct 2007, 22:59
Forum: CB Radio Repair and Troubleshooting
Topic: I got one for the techs out there. Help needed!!!!
Replies: 4
Views: 3957

Does the cobra have high swr output protection? Could be that its kicking in (i.e. reducing the output power) early due to some problem or effect between the radio and the amplifier. Just a guess unfortunately. Is the audio recieved on another rig distorted at all? Isn't 3 watts dead key with 20 pep...
by absorbentgnome
Tuesday 23rd Oct 2007, 9:59
Forum: Tech Area
Topic: Windows woe
Replies: 2
Views: 4708

Windows woe

I have finally had enough of Windows. My ebay account got hacked because I had been infected by a rootkit and keylogger, from an unknown source. I am very careful about what goes onto my computer and know how to remove nasties by hand etc. Also use Opera instead of IE and all the rest. This rootkit ...
by absorbentgnome
Thursday 4th Oct 2007, 10:56
Forum: CB Radio Repair and Troubleshooting
Topic: cudos to rick---he is the man
Replies: 10
Views: 7457

^^^^
What these guys said :D
by absorbentgnome
Sunday 16th Sep 2007, 4:32
Forum: CB Radio General
Topic: PITA Interference
Replies: 3
Views: 3695

Sounds like the power supply in a desktop computer, to me. Ferrites may help reduce the interference, but I wouldn't put money on it eliminating it. Yeah probably. Our TV gives out a little interference, I tried ferrite rings on the mains lead and on the scart lead and it made no difference at all....

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