开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育

FEATURE REQUEST: lower SWR protection threshold (1.5:1) for QMX


 

Hey all. (in particular, Hans)
?
I'd like to see the option of lower SWR protection thresholds in the QMX - 1.5:1 would be my preference. (maybe optional 1.25:1, 1.75:1 as well?) Trying to keep my radio happy, I run 9-Volts into a 12-Volt build and generally use resonant antennas, shooting for a VSWR well under 1.25:1.
?
If it's an issue of maximum number of menu options, I'd suggest perhaps deleting several on the high end - they go up to 9:1 right now.
?
I'm new though, so what do I know? School me.

?
Reflected power at 1.25:1 VSWR: 1.23%
Reflected power at 1.5:1 VSWR: 4.0%
Reflected power at 1.76:1 VSWR: 7.6%
Reflected power at 2:1 VSWR: 11.1%
Reflected power at 3:1 VSWR: 25.0%


 

Everything is a compromise in engineering and everything extracts a price. I rarely bother if my antenna is below 2:1 for all sorts of reasons, such as tuning range over several bands, height above ground etc.
?
https://www.wearecb.com/what-is-swr.html#:~:text=The%20radio%20will%20receive%20and,or%20less%20across%20all%20channels.


 

It's set in the 'protection' menu isn't it?? refer to the operating manual page 43 (v1.018)


 

On Thu, Aug 8, 2024 at 11:52 AM, Ian Jefferson wrote:
It's set in the 'protection' menu isn't it?
Yes, I'm aware of the location of the SWR Protection setting - "SWR threashold" menu item. I'm asking for lower thresholds than 2:1.
?