[Elecraft] On the subject of Amplifiers

[dw]

Hi Willis,
I looked at AD5X's web-page and I see he is using a pair of SPDT relays.
One of the cool aspects of that design is the incorporated AMP bias
switching.

I wonder how much switching noise the relays make?

I've seen a few articles on the use of reed relays for switching the AMP
in/out of the signal path.
But the caution there is making sure you get relays that have separate
contacts to avoid possible contact bridging.

I believe the Centurion utilizes one single SPDT relay also.

Interesting stuff!!  :~]
N1BBR


Subject: Re: On the subject of Amplifiers

Most are ground triggered, but not all.? Check before you buy!? I
am?having good results from an AD5X?QSK kit on my Dentron Clipperton L
that puts out about 600 watts.? I am not sure that it would switch a
more powerful amp, but if you are now at 10 watts, you will probably
find a 600 watt or less amplifier sufficient.? However, 10 watts is not
enough drive for most amps, so check the drive required before you buy.?
I get about 30 or 40 watts out of the 4-572Bs on 10 meters with 10 watts
of drive.? Many amps will require less drive than the Clipperton L, so
check.
?Willis 'Cookie' Cooke 
K5EWJ 
-- 
 Bw_dw at fastmail.net