Topband: Relay switching at the base on antenna

[MR TREVOR DUNNE]

Thanks for all the info Guys, I have some multicore cable out to the base of the antenna, I will try using a relay keyed from the key out on my rig, and see how that works, 

I want to switch in and out my tx 160 and 80m tx antennas when I rx/tx depending on what band I'm on,

Thanks
Trevor
EI2GLB
----- Original Message -----
From: Roger D Johnson <n1rj at roadrunner.com>
To: MR TREVOR DUNNE <ei2glb at eircom.net>
Sent: Sat, 23 Sep 2017 21:15:09 +0100 (IST)
Subject: Re: Topband: Relay switching at the base on antenna

Just Google bias tee...there are many examples. The RF choke is easy.
100 uH and it doesn't have to handle much current. The cap is more of a
problem. It needs to be about 0.1 uFd and it must handle the RF current
which depends on how much power you're running. I think most peple
just parallel a bunch of smaller caps. If there is no DC ground at the antenna.
you will only need one tee.

73, Roger


On 9/23/2017 1:32 PM, MR TREVOR DUNNE wrote:
> Could you point me in the direction of a circuit for this I'm struggling to visualise it,
>
> Thanks
> Trevor
> EI2GLB
> ----- Original Message -----
> From: Roger D Johnson<n1rj at roadrunner.com>
> To: MR TREVOR DUNNE<ei2glb at eircom.net>
> Sent: Sat, 23 Sep 2017 14:00:39 +0100 (IST)
> Subject: Re: Topband: Relay switching at the base on antenna
>
> Sure! I'm doing it with a 24 volt vacuum relay at my antenna. Run 12 volts to
> the antenna and through a series diode (for isolation) in the return line to the
> transceiver PTT. I have another diode in series with the amp keying circuit to
> keep it from affecting the relay at the antenna and vice versa.
>
>
> On 9/23/2017 8:39 AM, MR TREVOR DUNNE wrote:
>> Hi All
>>
>> Can Anyone tell me a simple way to switch a 12v relay at the base of an antenna using the rigs ptt as the trigger??
>>
>> Thanks
>> Trevor
>> EI2GLB
>> _________________
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>