[TowerTalk] RF Relay QUestion
Terry - AB5K
terry at ab5k.net
Sun Dec 16 09:28:26 EST 2007
I use the Magnecraft W389CX-7 DPDT relays as recommended by W8JI in a
previous tower talk post at:
A picture of a assembled relay box can be seen at:
73 Terry AB5K
----- Original Message -----
From: "Dennis OConnor" <ad4hk2004 at yahoo.com>
To: <towertalk at contesting.com>
Sent: Sunday, December 16, 2007 7:53 AM
Subject: [TowerTalk] RF Relay QUestion
>I just purchased a couple dozen of the project relays from WX0B for a
> They are standard relay frames/coils that he has a jobber mount a set of
> RF rated contacts on...
> They are configured for a straight through RF path, with no loops of
> twisted wires, or dipsy doodles, etc..
> The contacts are flashed with copper and silver...
> They are 3PDT, so you can put the 3 in parallel for high current, low
> contact resistance, etc...
> He syas he has not hipotted the contacts to the frame for really high
> voltage RF stuff, but for the usual 2 KW and reasonable impedence loads it
> is reliable.. He uses them in his products...
> What I discovered is that the coil end has a threaded hole in the center
> pole allowing them to be solidly mechanically mounted with the contacts
> raised up, as opposed to having to be soldered down to a circuit board...
> This is perfect for antenna switching with my remote control feedline
> Cheap is relative, but anything else that comes even close is $50....
> denny / k8do
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