When ''POWER ON'' then ''ON AIR'' lit contuninuous. RX works, all commands are working. When at ''SSB'' modus PTT'' or ''SEND'' is pushed, transciever goes back to RX. ''ON AIR'' is still lighting. At the ''FM'' ''AM'' and ''CW'' is posibile to reach full power, but not a minimum, then transciever goes ''RX'' again and ''ON AIR'' is still active. As load i am using R.F. powermeter TF1020A from Marconi inst.
have service manual, but, my brain is blocked Regards Mihalj Galovic, 9a5amg
Dear Sires, Sorry i am not finished yet with my TS-440S. I have found that TXB and RXB supply signals are present in same time. Transistor Q35 from IF UNIT was burned thru. Now the trasciever works in all modes excelent, but just on the 3,5, 7, 10 and 25 MHz band. I am looking for next damage away, but i have a little problem. I became a pacemaker last week, and must keep my right arm a vile. With regards M.Galovic 9a5amg
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Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx
usualy you have a transmit recieve switch
like this
.....common
RX <<-- >TX ptt
so three wires
the ptt button common in a cb with 4 pins is also ground
should be
black screen and i think brown
but you need to meter out the ptt common and RX TX
for rx audio switched radios then one pin is RX one pin is TX one pin is common or ground for the PTT and also ground for the screening copper braids and also ground for the transmit audio
so you have 5 wires
3 will be PTT 1 will be audio and one audio ground
usually white or yellow
so i think black and yellow or black and white
black being ground
just look up the schematic or service manual for your CB
and check out the 4 pin plug config
there is only two usual ones
cybernet or uniden so.. easy stuff
look for like cybernet cb 4 pin wireup in google or similar
remember just meter out using the beep test range on a cheep multimeter too see which three are the PTT
so the common of the ptt needs connected to the copper screening and also to the black wire all to the ground pin on the 4 pin plug
you can short from the ground pin on the cb side to its TX pin and the set will enter tx mode
same with rx audio enable {if uses most cb post 1984 dont use RX audio hard switching}
so just three pins to worry about
Since everything else works then is it USB or LSB or both? Did you check the power output when your in SSB and if there isn't any you can expect the drive transistors. Try putting the radio into the RTTY or CW mode and see if there is any power output when you key the mike PTT.
For the TS570, the audio input on ACC2 is ONLY active when the TNC PTT line is connected to ground. This also disables the front panel microphone input (and the digital storage unit). There is another PTT line on the ACC2 connector which is essentially paralleled with the microphone switch. This is useful for a footswitch when running SSB contest style, but cannot be used for PSK input through ACC2. The RS232 interface can be used to turn on the transmitter for regular microphone audio, but not for ACC2 input audio. The bottom line is, in order to use the ACC2 audio input for psk, you MUST use the ACC2 TNC PTT signal to transmit. The microphone PTT, the front panel "transmit" button, and the RS232 transmit command will not work.
Your PTT button is possibly at fault. It may be partially depressed, leaving your receiver open. Behind your PTT button there is an internal PTT button on the componet board. It may be stuck or defective.
But thats how a walkie talkie works, it stays in Receive Rx mode UNTIL you press the PTT button,, then it Transmits Tx, and when released it goes back to Rx, receive?
It sounds like you have a bad capacitor to the compressor. The humming noise is the compressor not starting up but is trying. It is either the capacitor or the compressor form your description. If you had a lightning storm or power surge about the time this happened it is most likely a bad capacitor. You can have the capacitor tested to see. Disconnect power before working on unit!
If the swr does not deflect even you press the PTT it might be the power amplifier has the problem,pls check also your power supply it should be regulated nor constant voltage output....
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