Antenna Relays

[Julius Fazekas n2wn]

Hi John,

Why not just order the K2 or KAT100 relays from
Elecraft? You can keep everything "standardized" so if
there's a problem you can easily swap out.

You may want to keep in mind that grounding an antenna
when it is not used may not be a good idea. It is
possible to significantly distort patterns with the
wrong combination. It may be worth detuning an antenna
before grounding it to minimize this effect.

This may be more of an issue with multiple vertical
antennas on harmonic frequencies.

Cheers,
Julius
n2wn
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[Franki ON5ZO]

> You may want to keep in mind that grounding an antenna
> when it is not used may not be a good idea. It is
> possible to significantly distort patterns with the
> wrong combination. It may be worth detuning an antenna
> before grounding it to minimize this effect.
>
> This may be more of an issue with multiple vertical
> antennas on harmonic frequencies.
> Cheers,
> Julius
> n2wn

True. I had +/- the same experience. Due to the size limitations of my lot I
need to 'cross polarize' between 80 and 160m. I had a working 80m dipole and
added a 160m dipole, which ruined the 80m resonance and I never got 160m
working (resonance not to be found). Now I have an 80m vertical and a shorty
160m dipole, within 10m of each other and no problem at all (not even in
SO2R @ 1kW).

73 de Franki ON5ZO

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[David Cutter]

I think the point about "grounding" unused antennas is most probably to drain static in which case a resistor in the grounding line would work and not detune much.

I wonder if anybody uses chokes on their verticals as they do on broadcast stations.  

David
G3UNA

>
> From: "Franki ON5ZO" <[hidden email]>
> Date: 2007/06/19 Tue PM 02:55:55 BST
> To: <[hidden email]>
> Subject: Re: [Elecraft] Antenna Relays
>
> > You may want to keep in mind that grounding an antenna
> > when it is not used may not be a good idea. It is
> > possible to significantly distort patterns with the
> > wrong combination. It may be worth detuning an antenna
> > before grounding it to minimize this effect.
> >
> > This may be more of an issue with multiple vertical
> > antennas on harmonic frequencies.
> > Cheers,
> > Julius
> > n2wn
>
> True. I had +/- the same experience. Due to the size limitations of my lot I
> need to 'cross polarize' between 80 and 160m. I had a working 80m dipole and
> added a 160m dipole, which ruined the 80m resonance and I never got 160m
> working (resonance not to be found). Now I have an 80m vertical and a shorty
> 160m dipole, within 10m of each other and no problem at all (not even in
> SO2R @ 1kW).
>
> 73 de Franki ON5ZO
>
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>

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