Adding a bit here, there are some simple ways to make a good switch
using relays. Use two relays so the contacts are in series. Arrange the
layout for good physical separation, a central common point with the
ports arranged in a circle works good, especially with 2 relays. Okay at
HF maybe less so at 50MHz and up. Even double pole relays with the
contacts arranged in a double series arrangement can work okay. Open the
relay, cut the wires and solder a bridge directly between the two
contact pairs.
There are some relays that will give a much higher isolation than the
typical average. These are super secret relays that nobody wants to
share the part numbers for ;)
Martin, HS0ZED
On 25/10/2019 23:56, Martin Sole wrote:
That sounds like the difference between a mechanical switch and a
basic relay.
Martin, HS0ZED
On 25/10/2019 23:26, Steve London wrote:
Thanks for the tips on measuring isolation, Wes.
Measured a few switches I had laying around. Old B&W round switch. 70
dB @ 3.5 MHz, 60 db at 28 MHz. Not bad, considering. Array Solutions
2 antenna Stackmatch. 45 dB @ 14 MHz. Hmmm.
73,
Steve, N2IC
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