[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 
>project <natch>///
>  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 
> tuners...
>  Cheap is relative, but anything else that comes even close is $50....
> denny / k8do
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