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Author Topic: What bleeder resistor  (Read 496 times)

What bleeder resistor
« on: December 19, 2025, 08:42:35 am »
With a long pole as aerial you get the wind blowing can built up static, also from thunderstorms, in the loft you still get the samething happening, maybe from electrical cables.
You need a dc short connection, between the signal and ground connection, I went with a short bit of wire, the aerial looked like a jim in the end. As when tried to find out the bleeder resistor needed kind of went to ham stuff, I couldn’t find anything about the value of the resistor, or what rating they would need to be for the power.
I though i’d just ask this, just wondering if anyone knows the value of resistor, maybe a chart of what the wattage need to be, so what it would need to be for afew w’s, would there any point doing this over using a wire. I suspect it wouldn’t need to be anything more that a 1/4 of watt, you wouldn’t want the value to be too low, suppose it could become a dummy load.
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Re: What bleeder resistor
« Reply #1 on: December 19, 2025, 01:03:23 pm »
There are 2 different approaches I have and would use for this application, first being an very large air wound inductor on either an acrylic or plastic former, which to DC is a short circuit to ground and having no affect to the antenna performance (as-long-as the inductance is high enough). This is a typical ham style approach too and sometimes this inductor can reside inside the TX its self connected across the antenna connection. The other option is to use static discharge balls spaced according to the power rating of the transmitter , however this is more of a broadcast thing and with Medium wave masts especially.

The bleeder resister will also work and I'd perhaps choose a valve close to 1Meg ohm and only requiring a power rating of 1/4 W even at QRO power levels of 500W.

One final approach I also see in some Ham home-brew kits are GDT's or Gas Discharge Tubes. Much like a resister and are even use in commercial lighting arresters.
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Give me a AM transmitter with things that glow any day.

Re: What bleeder resistor
« Reply #2 on: December 22, 2025, 09:22:49 am »
Thanks I put the mega resistor in place, seemed to change the tuning, values of c, but it dose seem to working alitte better now and looking alot neater. :D :o
The balls thing dose seem interesting imagine sparkz flying between them, like something in a lab, someone have to get their chain mail outfit on..nicola telsa hopefully benjamin franklin dosen’t get electrified. ;D
This would of saved some expensive equipment going kput afew years ago wonder why they don’t just put it in the tx if its just a resistor..to have tempreture protection and swr for it to blow from abit static. It always gets me that standing wave ratio is sometimes pronounced wah, :) how is the wah today lol your maybe thinking hair clippers
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