This is an old 148 that was in a motor home that was sitting for the last 15 years the face was green and the meter a little sticky,So a friend of mine put a new meter in it.Is their a potentiometer on the board that i can turn to fix that? Thanks Chuck. PS the radio was made in taiwan.
Re: When I key the radio the meter pegs in s/rf mode.
There is a pot inside the radio to adjust the meter. if the meter did not come from the same type radio then most likely it is not the right one all meters are not the same there is also a resister that jumps across the terminals of the meter that needs to be there to keep the meter from banging the side when you key the mic.
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best way is to leave the radio in piece and obtain a linear amplifier to do the job a 10 meter ham radio amplifier will do nicely but you must re-tune it for the 27 mhz band 10 meter band is 28 mhz. RF amps work best using side-band mode.
can you be more specific please ? TX meter or RX s meter ? check power supply voltage is stable, obviously on RX its essential to use a constant signal, of course, if you're doing it without test gear & just doing a quick 'tweak' comparing with a good know s reading off a known set - a s9 signal is usually the standard point they calibrate to. although on a CB set its not a greatly important. on TX you may first want to check RF power out is constant first, so a dummy load (in case aerial swr is changing while on TX) needs to be used. If actual RF power is changing, suspect drying electrolytic capacitors, these sets are 30 years old, so its not unlikely. dying driver or PA transistors or dry joints are also possible. or if everything checks out, possible voltage regulation probs, so check 2SA1012 AM reg isn't dying and the other ****** too. If you're lucky, its just the variable resistors giving up.
no matter what s/rf you are looking at it should not key much beyond an s-9 . vr 3 controls the meter. Key the mic and adjust it to s-9 then check you modulation.If you still think you need more then adjust vr 4 .
without more detailed info, quick suggestion - thermal fault, if all TX audio works when in this fault condition, it may be fair to assume audio IC is ok and check electrolytic capacitors and dry joints.
Does the radio have any rf output? Use a swr/watt meter to check. If if doesn't have any output that would be the cause of the problem.. then its another issues.. May need some test equipment to find the fault on that one. You could send it in to us and we can fix it. We do not charge to look at any radio -no bench fees-.. Let me know Ill get you any info that you need.
OK bare with me now i have no idea of your knowledge level with CB/ SSB radios.
Lets make sure our setting on radio face is correct before we decide this is an mechanical problem.
Set the following
Volume knob 12 o'clock
Dynamike knob 12 o'clock
Squelch full counter clockwise
Rf gain full clockwise
Select S/RF position on the SWR/CAL switch
Select AM position on the USB/AM/LSB switch
Select CB on the CB/PA switch
Now there will be some critics with opinions on the next instructions. Place a small screwdriver or test lead from a multimeter in center conductor of antenna jack listen for onair noise or radios operators to verify RX is working. Now remove the antenna/screwdrive/testlead. Then key mic just long enough to notice if the meter is swinging do not hold the mic button long this can damage the final. I tell you to do it this way rather that connected to your antenna system so we can eliminate the question if it is you antenna sytem or the radio.
If the LSB or USB was selected when you keyed the mic you would see no meter movement this is due to the lack of a deadkey or carrier for SSB which is a much more efficient method of transmitting on AM.
There are few things that affected the rx and tx together.