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UV82 - No UHF Tx

 

A UV82 has come my way as part of a silent key estate.?

It transmits on 2m but not 70cm

I¡¯ve checked the settings to ensure it hasn¡¯t been restricted, tried resetting and reprogramming, still no tx on 70cm. Not even enough to detect on a receiver nearby. Nothing on the display to suggest it isn¡¯t transmitting when the ptt is pressed.

My understanding, which could be false, is that these radios are largely ¡®common¡¯ path for their RF - ie only one PA, driver, etc.?

While a bad reactive component may be the cause, if that were the case ( at least if in the PA etc), I¡¯d expected some RF, even if just enough to detect on a nearby Rx.

Has anyone seen this before or have any ideas, please?

73
Brian
G8OSN/W8OSN
 

¿ªÔÆÌåÓý

Brian,

In general, regarding the RF path, I believe the same (but never really looked at it in detail), in that if VHF is working, then UHF should be working. So it does sound unusual that UHF tx is not functional.

However, I have seen a similar situation on my own HT, where it looks like TX is working, but no RF is occurring.

Mine occurred when switching from Chirp to Chirp-Next to perform the programming. Whilst I cannot say for sure that it was the change in application, the main issue was "translation" of duplex, and the line from the Wiki was

"This sets the duplex mode of the channel. If set to (None)?then the transmit and receive frequencies are the same. If set to either +?or -?(plus or minus) then the transmit frequency will be either above or below (respectively) the receive frequency by the value of the Offset?field.

If the duplex is set to split?then the Offset?field should contain the absolute transmit frequency to be used (if the radio supports this capability).

If the duplex is set to off?then transmission on this channel will be disabled (if the radio supports this capability).

Note that for simplex channels, this should be set to (None)?and repeater channels should have this set to either +,-,?or split."


On the older application it handled the Duplex being blank, where as on the new one it had to be set to "None" otherwise it would not transmit RF.

Now we are just talking Simplex here (as if normally setup for repeater you have a + or - entered).


This may not be your issue as it does sound like you have a handle on resetting/reprogramming, but the fix for mine was


  1. Factory reset?
  2. Using Chirp-Next - perform a read of the "blank" Baofeng (this is important for it to have as its starting point)
  3. Now perform you programming and/or imports of frequency's / channels etc (don't just reload an old image)
  4. Made sure the duplex is set correctly
  5. Wrote back to the Radio

The export of a base blank image of the radio model you have is important. If the previous owner had already "corrupted" the image that was on the radio, and you created a new base off that, you may have continued the issue.

Anyhow this may be of no use to you, but passing on some experience with a similar issue. Needless to say, now working without any issues.

73's
Bob (VK1ED)

From: [email protected] <[email protected]> on behalf of Brian Reay via groups.io <g8osn@...>
Sent: Wednesday, 28 February 2024 9:26 PM
To: [email protected] <[email protected]>
Subject: [Baofeng] UV82 - No UHF Tx
?

A UV82 has come my way as part of a silent key estate.?

It transmits on 2m but not 70cm

I¡¯ve checked the settings to ensure it hasn¡¯t been restricted, tried resetting and reprogramming, still no tx on 70cm. Not even enough to detect on a receiver nearby. Nothing on the display to suggest it isn¡¯t transmitting when the ptt is pressed.

My understanding, which could be false, is that these radios are largely ¡®common¡¯ path for their RF - ie only one PA, driver, etc.?

While a bad reactive component may be the cause, if that were the case ( at least if in the PA etc), I¡¯d expected some RF, even if just enough to detect on a nearby Rx.

Has anyone seen this before or have any ideas, please?

73
Brian
G8OSN/W8OSN
 

Thank you Bob, i will give that a try.

73
Brian

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