Batboard

I have a Saber II when I bought it and programmed it, it seemed to work great. Then I noticed that when I pressed the TX button I could hear the radio on my mobile key up but there was little to no audio actually coming through. Other than that the radio works flawlessly. There is a bypass module in the radio which is correctly installed. I checked RSS and the volume on the mic is turned up...any sugestions?

Mike

mic on the radio is bad or clogged with debri .

Hello:

Try runnign your service alignment, the VCO modulation directly affects transmitted audio and if the setting is too low, the VCO can't properly modulate the transmitter, just don't set the level too high.

Check the output on a service monitor to ensure your deviation is within limits and not clipping when used on a repeater pair, keep the deviation at or below 4.5 Khz.

As suggested previously, you could also have a defective mic element, those do go bad as they are the electret type and require a +3.3 Volt source to derive audio from when in transmit.

The level you would see directly from this would be less than 1mV AC, so you need a sensitive meter to see a response.

Pin 21 of U102 is the audio input line, and pin 11 of the same IC is the audio output into C23, there should be 0.5 VAC on this line in transmit.
This line also feeds pin 11 of U101 audio filter, where you should be able to take a direct reading if you can do so with the rear cover removed while keeping the modules retained on the board, if this is not done, the radio will squeal, hum and not work properly, the modules MUST be securely fastened to the controller board for the radio to function properly.

I hope this helps you resolve your TX audio troubles, I've run across this many times in the past myself, and many times it can be resolved with a softpot adjustment within the RSS.

The softpots work in proper order...

-------> = higher
<------ = lower

Happy RFing!


Enterprize.....One to beam up!

Unfortunately I do not have a service monitor availible. I will check the VCO though.

Thanks,

Mike

Would someone be willing to look at this radio for me. It is in great shape and would love to be able to use it! PM me if you would be willing to look at it and let me know who much you think it would cost. As far as I know this was a backup radio and barely got used!

Before you go any further, take off the front shield and check
where the mic/speaker flex from the shield plugs into the main board with the small four-pin connector. If that's okay then move on to checking the mic element etc.

Pull the secure bypass module and check to make sure the pins are clean and making good contact. You can even remove the bypass module and solder a jumper in on the back side of the radio board.

It might just be a bad connection on the bypass module.

Is this a do it yourself job or something for a radio shop?

I checked the Mic. It is plugged in correctly and seems alright in RSS! So I guess the mic needs to be replaced!

Is there any one that knows where to get on and if so how much???


Mike

Mike,

Probably the most common way to change the mic on a Saber is to
change the entire shield, using another good radio as donor, then
picking up another shield later to put the donor radio back into operation.

Remember that you need the longer shield for a Securenet radio.

I bought a NOS VHF Saber III a couple of years ago and had the same problem. Upon investigation with RSS, it had never been set up initially by the dealer...deviation was set to zero. So based on my own experience, I'd say that's one of the first things to check. Can't tell from the thread whether you have been able to do so or not.

Saber deviation is a little more complicated to get right than some other radios...there are three separate adjustments, one for lower voice frequencies, one for higher voice frequencies, and a third for the squelch encoding signal.

Good luck with your radio...

Regards,

Interestingly i put my Saber II inot the SVA and it does the same thing the recieve radio keys up but i get no other audio, recieve is great!

display mic! I know There is noting wrong with the sva as i have used my saber III in it and it was brand new when i bought it