[TowerTalk] External Receive Antenna Switch

[Richard (Rick) Karlquist]

On 10/20/2010 10:34 PM, Roger (K8RI) wrote:

> terminals. If need be you could use a surplus vacuum relay or a pair of
> them for the receiver. Set the key and unkey time constants so on key up
> the receiver disconnects and shorts out first and when unkeying the
> receiver is connected *after* the output drops.

> Roger (K8RI)
>> Anyone know if something more exotic exists ?

You don't need a vacuum relay, just a reed relay that can handle
a couple of amps.  They are fast enough for QSK.  I built one into
a box that adds a RX antenna input to my TS-570.

Rick N6RK