[AMRadio] Testing a TR Switch


Ellen Rugowski ellenjoanne2003 at sbcglobal.net
Sun Sep 14 12:15:41 EDT 2008


Good points to Mike.  I didn't consider those issues.

----- Original Message ----- 
From: <k0ng at inebraska.com>
To: <amradio at mailman.qth.net>
Sent: Sunday, September 14, 2008 10:57 AM
Subject: Re: [AMRadio] Testing a TR Switch


>
> Hello Mike: If your Wattmeter is sensitive enough to show 100mW to 1 Watt
> and you applied say 100 Watts to the switch and the Wattmeter showed
> less than 100 mW, I would think that would work to test the B&W switch
> for use with
> tube type equipment. For a sensitive solid state receiver, I would hope
the
> "feedthru" would be less than 10 mW.
>
> You would need two 50 Ohm loads (or a resonant antenna for the
transmitter).
>
> The above is exactly how I test my B&W/Johnson switch's. Just my opinion.
>
> Also, dont forget to connect your Low Pass Filter to the antenna connector
> of the switch. The switch has been known to produce harmonics.
>
> Good Luck es 73, Charlie,  K0NG  ..
>
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