Sainsonic GT-3, GT-3 Mark II additional notes

Thanks to a reader in Denmark I ran into a new, undocumented feature present in modern UV-5R varieties which have both a Band and an A/B button. The feature has been confirmed in the GT-3, GT-3 Mark II and the to-be-reviewed GT-3TP, but might be true for recent UV-5Rs also.

1750 Hz and 2100 Hz burst tones
In most parts of the world burst tones were once used to open up repeaters but abandoned in favor of CTCSS.  It’s one of the reasons why I don’t look into that feature too closely anymore; it became sort of irrelevant. Some European repeaters will still open up when a 1750 Hz tone is transmitted in order to stay compatible with older ham equipment.

Without notifying anyone (what’s new) Baofeng added the 2100 Hz burst tone to its bag of tricks. The problem is that this tone is not documented anywhere in the manual, and that they use the Band key to generate 2100 Hz instead of 1750 Hz. So, if you follow the manual, you’ll send 2100 Hz instead of 1750 Hz.

This is what you should do:

  • Ignore the manual
  • press PTT + A/B to generate 1750 Hz
  • press PTT + Band to generate 2100 Hz.

I mailed this to John ( so it can be included in the documentation.

Burst Tones

GT-3 antennas
The SMA thread on GT-3 antennas isn’t very precisely made. You might feel some resistance once every 180 degrees when screwing it on. It’s no biggie an will resolve itself after some use, but worth knowing.

UV-5R ‘reverse’ function oddity
When you have a repeater programmed in one of the memories and assuming you only programmed a CTCSS tone for TX, not RX, you would expect CTCSS to be irrelevant when listening reverse. That’s not the case; your Baofeng will ‘invent’ R-CTCSS on the fly. According to some hams this behavior can also be found on certain Kenwood models.

UV-5R’s latest bug: listen to the beep

When it comes to keeping track of Baofeng / Pofung flaws, the Miklor page is way ahead of me. I only run into newer models by accident, but don’t order them anymore. It’s just too expensive.

The latest UV-5R bug pointed out by John K3NXU involves muted RX audio when the keyboard beep is switched off. Personally I find keyboard beeps very annoying, and always switch it off. No new model for me, that’s for sure…

It’s a bit of a silly bug, created by a sloppy programmer, and never caught by other Baofeng employees responsible for intercepting these things – if such employees actually exist. Let’s face it: the UV-5R is a dirt cheap product, having competent QA personnel on the payroll might not be feasible.

Not the first time
Since its inception the UV-5R had its fair share of bugs, from being off-frequency on receive to muffled TX audio to meaningless squelch levels. Under ideal circumstances bugs wouldn’t be a problem: just update the firmware and you’re fine. Unfortunately this can’t be done: UV-5R firmware can’t be updated afterwards.

If you can’t live with the bug, the only thing you can do is send it back or wait for a new version to come to market. If you bought directly from China, sending back the radio is often more expensive than buying a new one. Basically you’re screwed. Food for thought if you love conspiracy theories: Baofeng does it on purpose!


Baofeng UV-5R bugs to date

  1. Direct frequency access. See Baofeng UV-5R Review Part 1.
  2. There are 9 settings for the squelch threshold, but changing it doesn’t make a difference. Whatever the setting, the Baofeng wakes up at -129dBm on VHF, and -126dBm on UHF. Under normal conditions the default squelch threshold seems to be just right, but in a noisy environment this bug might haunt you.
  3. The same is true for the VOX sensitivity. It doesn’t matter what setting you choose, the sensitivity stays the same.