Re: Elecraft: Amplifier for K1

[Martin.Evans]

Thanks Bob, yes the resistors are metal film or something like that but
definitely not wire wound. I spent a fair time on the air last night on
40/80 with the K1 and 100W from the TS520. It works like a charm. The K1
switches the TS520 T/R relays via a little 2 transistor switching circuit
(looking at the K1 6R line) which grounds the TS520 PTT line. I built the
circuit onto a small piece of vero board which plugs into the 3 pin socket
on the filter board (like the official K2 mod) . A screened cable then
connects the open collector to the PTT pin on the TS520 Mic socket.

I've set the T-R delay to about 500ms so the relays don't switch too much.
Do I need to worry about this? If I set it so that it switches say between
each word will that wear out the relays too quickly, not sure how robust
they are. When operating the K1 barefoot I use a T-R delay of 50ms.

Thanks
Martin
M0KWV





[hidden email] on 13/01/2005 16:58:55

To:    [hidden email]
cc:

Subject:    Re: [Elecraft] Elecraft: Amplifier for K1



Hi Martin,

Got that fine.

You have got the best of what is possible using the TS520 with the way you
have done the mod.

Just a point make sure you do not use 2 x100 ohm  wire wound resistors for
the dummy load. They must be carbon otherwise odd  effects can occur due to
inductance. You may be well aware of this effect, but I  am pointing it out
in any case as 2.5W is one of the standard dissapation values  for wire
wound resistors!

Regards,
Bob, G3VVT




Why not take a look at our Web site?
http://www.simoncarves.com

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[Ken H]

Martin, could you tell me a bit more about how you interfaced the K1 to the
TS520?

I have an old Atlas 210 I would like to use as a power amp with my K1 as you
are using the TS520.  I start writing a  "how to" question and realize I
really don't have all the knowledge to even ask the questions.  I guess the
best thing I can say is - can anyone help me with this project of using the
Atlas 210 as an Amp?  What are the steps involved?   I know there is more to
it than just injecting the K1 signal into the Atlas just past the driver
stage.  I am not trying to save the Atlas for anything else.

73 de Ken
K9FV
K1 #1951


----- Original Message -----
From: <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Friday, January 14, 2005 3:13 AM
Subject: Re: [Elecraft] Elecraft: Amplifier for K1

Thanks Bob, yes the resistors are metal film or something like that but
definitely not wire wound. I spent a fair time on the air last night on
40/80 with the K1 and 100W from the TS520. It works like a charm. The K1
switches the TS520 T/R relays via a little 2 transistor switching circuit
(looking at the K1 6R line) which grounds the TS520 PTT line. I built the
circuit onto a small piece of vero board which plugs into the 3 pin socket
on the filter board (like the official K2 mod) . A screened cable then
connects the open collector to the PTT pin on the TS520 Mic socket.

I've set the T-R delay to about 500ms so the relays don't switch too much.
Do I need to worry about this? If I set it so that it switches say between
each word will that wear out the relays too quickly, not sure how robust
they are. When operating the K1 barefoot I use a T-R delay of 50ms.

Thanks
Martin
M0KWV





[hidden email] on 13/01/2005 16:58:55

To:    [hidden email]
cc:

Subject:    Re: [Elecraft] Elecraft: Amplifier for K1



Hi Martin,

Got that fine.

You have got the best of what is possible using the TS520 with the way you
have done the mod.

Just a point make sure you do not use 2 x100 ohm  wire wound resistors for
the dummy load. They must be carbon otherwise odd  effects can occur due to
inductance. You may be well aware of this effect, but I  am pointing it out
in any case as 2.5W is one of the standard dissapation values  for wire
wound resistors!

Regards,
Bob, G3VVT




Why not take a look at our Web site?
http://www.simoncarves.com

*************************************************************************
The information in this email and any attachments may contain
privileged and/or confidential information intended solely for
the use of the individual or entity to whom it is addressed.
If the reader of this email is not the intended addressee, or the
employee or agent responsible to deliver it to the addressee,
you are hereby notified that any dissemination, distribution or
copying of this communication is strictly prohibited.
If you have received this communication in error, please notify
me by telephone or email and delete all copies immediately.
*************************************************************************
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

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Elecraft web page: http://www.elecraft.com

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Elecraft mailing list
Post to: [hidden email]
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Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com