[Elecraft] 1N4007 diode question?

[Don Brown]

Hi

Pin diodes act more like variable resistors than diodes at RF frequencies.
So think of D2, D3 and D4 in series when turned on and open circuits when
turned off. If you replaced one of the diodes with a non PIN type (1n4005)
then the other diodes may still provide enough isolation when in receive but
I would still replace the diode with the correct type (1n4007) that has the
PIN internal construction. Wayne may want to explain this more fully as I am
not an expert on this and I am getting my information from several internet
sites and the ARRL Handbook.

Don Brown
KD5NDB


----- Original Message -----
From: <k6se@juno.com>
To: <elecraft@mailman.qth.net>
Sent: Monday, April 07, 2003 4:01 PM
Subject: Re: [Elecraft] 1N4007 diode question?


> I've been reading with interest the comments about substituting a 1N4007
> with a 1N4005.  When I built my K2 I quickly needed a 1N4007 (I now
> forget the reason) and got a 1N4005 from the local RS store.  I installed
> it and it's still there.
>
> As I recall, the location was on the rear of the RF board (in D2, D3, or
> D4).  After many hours of operation, I haven't noticed any problems in
> T-R switching that might be due to this substitution.
>
> 73, de Earl, K6SE