Re: RX #V6 quits working when ant coax braid is connected #v6

Andy_501 <andrew.webb.501.ve4per@...>

Yes I was wondering about something like a lightning hit blowing the surge protector built into the switch so went to check and discovered the radio doesn't even turn on now so tomorrow likely I will have to replace a fuse in the external power supply; just hope the rig wasn't damaged. GRRRRRR I was just getting close enough to try a QSO or two.

On 2020-02-25 1:22 a.m., Raj vu2zap wrote:

Remove the jumper cable between the coax switch and the rig and check for a short.
Happened to me..


At 25-02-20, you wrote:
The rig goes through a coax switch which I can select a 40 M Hamstick whip, a 20 M small loop antenna, and/or 100 W 50 Ohm dummy load. Doesn't matter which ant is selected same situation so it would seem voltage difference would be the most likely place to start.

Power supply is plugged into UPS but antenna grounds are all direct to a dedicated ground rod for radio gear alone. So might be a potential difference between radio ground rod and electrical utility ground rods.

Thanks for the tip Raj

On 2020-02-24 10:50 p.m., Raj vu2zap wrote:

I suspect that your antenna cable is shorted or there is a voltage difference between
your ground and your power supply -ve

When partially plugged in the system behaves like a long wire.

See if your antenna is working with another radio.


At 25-02-20, you wrote:
I finished setting up the rig and moved it into the shack to put it on full blown antenna expecting some better signals that the minor few available from the temp mag mount HF vert on metal deep freeze lid conterpoise.

When center conductor is inserted 60-80 % inserted signals are evident and AM broadcast stations within 100 mi are easily received and BFO calibration can be adjusted properly. But as soon as the connector is fully inserted in antenna and ground braid makes solid connection signals disappear on all bands and there seems to be a flicker in the display. On a couple of occasions the display completely blanks and goes white. Power off reset then restores display but not the signals until coax outer conductor is disconnected. Seems like some sort of ground loop almost connecting through the input????

Any pointers??


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