Excalibur SSB base radio will work fine one day,not the next.
This transceiver is a moody *****.I did my best to look for any cold solder joints,power supply is reading 13.5 volts dc.the radio always lights up,but sometimes does not trans or receive,next day it could work fine....While I got your attention,I also have a old tube radio that popped 2 oil caps,a.1uf and a .047uf 600w v made by Atlas,they shot the foil out,is there a modern equivilant replacement? The radio is a Robyn T-123B.Thanks,Brozinski.
Re: Excalibur SSB base radio will work fine one day,not...
Might be worth checking the microphone cable on the transceiver, specially near the plug, or the push to talk switch. I saw this umpteen years ago with a CB that was intermittent.
High voltage capacitors are a bit hard to find but look on the net for vintage radio suppliers. While you have the tube radio open, look for resistors that gone high, this can put higher voltages than design on the caps and of course can quickly wreck tubes that were otherwise OK.
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If your receiver was operating previously but now the SSB option is not working, very likely the sideband detector has failed. I'm not directly familiar with your Yaesu unit but, in most Yaesu transceivers, the SSB chip and control circuit (including diodes) is identified in print on the main board.
It sounds like you had a cold solder joint. Leaving it in the sun probably temporarily corrected it. I would take it to a tech to have all the solder joints corrected, unless you are handy with a soldering iron. The problem will most likely come back.
All you have to do is pull the top cover off, which will show the bottom, or trace side of the board. Using a soldering iron, make sure any solder joint that doesn't fully look soldered and make sure the solder is fully covering the joint. If need you may have to add solder.
As for the frequency counter going nutty when you modulate, Don't worry about it. There is nothing wrong. Because when you modulate you are modulating the carrier signal you are changing the signal so the counter will interpret that as a different freq because it cannot differentiate. Freq counters are for use with carrier only. As long as the carrier shows correct, it is right.
I would suspect cold solder joint at frequency Crystal or around L26 freq tx alignment point. Cold solder joints are basicly breaks in the solder or the 2 surfaces that were being solder were no equally heated when solder was applied. These tiny crack can expand with heat or develope corrosion that becomes an insulator. I suggest that you remelt the solder adding a rosin core silver solder in this area on trace side or have it done if you are not comfortable with soldering.
A good test is to remove speaker/component cover removed with radio upside down. Power up radio, antenna connected, mic gain down, key mic then lightly press down on the crystals there are 3 marked as X1 X2 and X4. Watch for devation on frequency counter.
It is unlikely that you have a bad crystal. I suspected voltage is dropped in this area it could be a capacitor. Since you mentioned Base i assume it is not mobile less likely it is cold solder joint.
Whatever the problem i suggest you go thru replacing capacitor it could make it much more stable. Nov-2006 Stopped Production
sounds like some loose solder joints. check power output with external meter to see if output is ok . i think youprobably have 2sc1969 finals init unles someone has changed them theyshould put about 25 watts if tuned correctly. also check the antenna a and antenna b switch to see if something has shorted across it inside cabinet.
It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.