Re: Re[2]: LF: Re: Antenna relays

[Andy Talbot <andy.g4jnt@gmail.com>]

One double pole changeover (six contact terminals in total)  OR

Two double pole single throw  OR

or four SPST  OR

or two SPDT

All assuming a single set of contacts will hold off your LF antenna volts

'jnt

On 19 November 2015 at 19:40, Chris Wilson <chris@chriswilson.tv> wrote:

Hello Rik,

Thursday, November 19, 2015


Whilst you experts argue the technical niceties of the challenge, let
me ask what might be a simple question to you guys. What is the
minimum number of two contact vac relays I would need to go from
strapped ladder line to top of loading coil, to unstrapped ladder
line, disconnected from the top of the coil, and now connected to my
coaxial feed line, presumably itself disconnected from ground and the
bottom of the loading coil? It seems a lot would be needed to me....
:( Thanks! I can see me leaving wet weather gear by the front door and
doing this manually!


> Hello Stefan,

> I am not sure a (lossless) capacitor in parallel with the coil will lower the antenna efficiency.
> I would assume that it will affect the antenna impedance as seen
> from the TX, but will not change the ratio Rrad/Rloss (what
> determines the antenna effeciency).

> 73, Rik  ON7YD






--
Best regards,
 Chris  2E0ILY                          mailto:chris@chriswilson.tv