Lee,

Is there a problem with creating IMD products withe the 1N4007's at the 
input of the receiver, or are they too slow to cause a problem?

73,   Tom   W0IVJ

Lee A Crocker wrote:

>I reviewed the K-2 100W PA diode switching circuit. 
>It's a very clever idea, but it still would be quite
>expensive and complicated compared to a simple relay
>substitution.  The cost and complexity is not in the
>1n4007 diodes, but in the surrounding control
>circuitry and the +150V power supply you need to make
>it work.    
>
>I was told the relays in the SDR were 3ms relays
>except the relays in the PA.  Ten Tec uses relays in
>its QSK T/R scheme even up to its high power amps and
>they are not vacuum relays, so I can't see the
>advantage of a $50+ 1N4007 diode circuit over a ten
>bux substitution of fast drop-in relays.    
>
>73  W9OY 
>
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