Author Topic: Possible to get an RF shock from a TG?  (Read 808 times)

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Offline cncjerryTopic starter

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Possible to get an RF shock from a TG?
« on: March 02, 2018, 05:23:26 am »
Twice today when unscrewing some coax from my reflection bridge, I got what felt like a nasty little rf burn under my wedding ring.  The coax is hooked to an antenna outside and I was tracing from 1 - 30Mhz.  If it isn't the TG, I guess maybe static on the antenna?  It wasn't a shock like you would get in sox across a floor when touching a radiator, It was more like a circular burn feeling under my ring.  Gets my attention, no harm done.  Possible?  I've had RF burns from my 2KW amp, this felt like a low-level version.  Hands were damp both times.

If not the TG, then I have to figure a way to ground that antenna before I blow my SA front end.

Thoughts?

Jerry
 

Offline Performa01

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Re: Possible to get an RF shock from a TG?
« Reply #1 on: March 02, 2018, 06:15:47 am »
I think the "RF burn" is coming from sheath waves and is proportional to RF power and SWR. I have experienced the effect at power levels <30W for SWR <1:1.5 and would expect the SWR to get much worse if some antenna is swept over a wide range.

On the other hand, a TG usually outputs <+10dBm and does not have any resonant matching network at its output. So I have to doubt it could cause a "burn", no matter how bad the SWR gets.

To be sure, connect your antenna to a high impedance scope input and observe the voltage levels, also for DC.
 

Offline cncjerryTopic starter

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Re: Possible to get an RF shock from a TG?
« Reply #2 on: March 02, 2018, 06:45:17 am »
Not really a burn, moremmlike I have insulation under my wedding ring.  Then It goes away.  But it does get my attention.
 


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