[Elecraft] Choke for QRP with unbalanced antennas?

[Brian Hunt]

I use a large ferrite clamp-on to isolate my short whip/counterpoise from my KX2. Needed tor running digital modes. The large variety will hold 3 turns of RG-58 which seems to be enough for what I need. IIRC I got them from ProAudio Engineering. GL

73,
Brian, K0DTJ

> On Nov 20, 2021, at 10:10, Julia Tuttle <julia at juliatuttle.net> wrote:
> 
> Hi folks,
> 
> I was tinkering with a whip + counterpoise antenna connected to my KX3 by a
> short stretch of coax with BNC connectors a couple nights ago, and
> discovered (painfully) that there was quite a bit of RF coming back along
> the ground when I bumped the outside of the antenna connector. I know from
> experience that the KXPD3 can end up tingly in turn, and I'd like to avoid
> that.
> 
> If this were a fixed antenna, I'd just slap one of the LDG RU-1:1 ununs on
> it as a choke, but they're pretty chunky -- they're rated for 100 W CW, and
> have SO-239 connectors, which would require adapters on both sides in this
> setup.
> 
> Does anyone know of a choke more appropriate for this kind of setup? I'd
> prefer something smaller (rated for maybe ~40-50 W continuous?) and
> natively BNC, so I don't need to juggle adapters.
> 
> More broadly, is this the appropriate way to fix this problem? This was
> with the counterpoise extended as best I could, and with the radio powered
> from mains (which may have actually made the problem *worse* by providing a
> more attractive path than the counterpoise?).
> 
> (As an aside, when components like baluns/ununs or tuners are rated as "100
> W CW, 200 W SSB", do they mean literally a continuous wave, or do they mean
> CW at a standard Morse duty cycle of roughly 50%?)
> 
> Thanks and 73,
> 
> Julie
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