>
>Hi Carl:
>
>Interesting thought. Probably should not discuss receivers on the Amps
>Reflector - but it is simply the continuation of an amp related topic.
>
>It makes sense to put the rf choke at the output side of the relay so that
>it shorts anything that is not supposed to be there to ground - and, as Hans
>has suggested, improve receiving back-ground noise. There is one minor
>caution, though, in that the rf choke will drop in impedance at some point
>and affect received signals. A 2.5 mh choke would be fine through 160
>meters when using a low impedance antenna - but suppose you also use the
>receiver to receive on the broadcast band or lower - where the antenna might
>be high impedance. Thus, it might not be appropriate to hang a normal rf
>choke across the receiver input of a general coverage receiver.
Agreed. 2.5mH chokes have many resonances in the HF range. I use a
300k-ohm resistor to bleed off any static charge across my Hertz
antenna's tuner. .
>
>Sorry to digress, but it really has to do with design of power amplifiers -
>and whether the rf choke should be hung on the output side of the relay.
>There is merit to the suggestion.
>
A choke across the load-C is probably not all that useful because - if
the DC blocking cap fails, the typical load-C is going to arc to ground
and blow the mains breaker/fuse.
later
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|