[Elecraft] EXTREME signals

Tue Mar 18 12:38:00 2003

To quote from Wayne's write up on this item...
quote
Results:
With the diodes in place, we've been able to transmit at 100 watts into an
antenna just a few feet from the K2's own antenna with no apparent K2
receiver degredation. In these tests the receiving antenna was non resonant.
But at the lower power levels used for HF pack operationa, there should be
no problem even with resonant antennas operating in each other's near field.
end quote

73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~
----- Original Message -----
From: "Dave" <[email protected]>
To: "Indy" <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, March 18, 2003 12:17
Subject: Re: [Elecraft] EXTREME signals

| Fred (and Gang)
|
| What sort of antenna spacing are we talking about? I sometimes operate
with
| two rigs and two operators in a "field" setup, I would hate to damage the
K2
| (or even my humble K1) by too much RF into their front ends...
|
| Dave, G4AON
| http://www.astromag.co.uk/k2/
|
| ----- Original Message -----
| From: "Indy" <[email protected]>
| To: <[email protected]>
| Sent: Tuesday, March 18, 2003 4:06 PM
| Subject: [Elecraft] EXTREME signals
|
|
| It is so difficult to use language in such a way as to be absolutely clear
| to everyone.  let me try agn.
|
| Wayne's back-to-back diode mod across the IF has absolutely no negative
| impact upon the radio.  The diodes do not conduct until an extremely
strong
| signal is present.  When such is present, the diodes bleed off the excess
| signal to ground.
|
| the result:  Under normal receiving, one will not know the mod has been
| done.  In the extraordinary case that a nearby station, for example, QRP
to
| the field, four guys have their QRP radios set up near each other, if you
| tune across one, that signal will sound no different than any other S-9
| signal.  However, when you tune off of that nearby signal, the AGC will be
| pumping with the keying of that extremely strong nearby signal.
|
| In my test, I was keying a 100 watt station a few INCHES away from the K2.
| I could tune across that signal with impunity, but if I was ten khz away,
| the K2 would pump with the keying of that 100 watt adjacent station making
| copy of a weak signal impossible, though I could copy a strong signal that
| would impact the AGC anyway.
|
| However, if the MP were at five watts, a few khz away there was no longer
| any pumping ;-)
|
| If you take your radio to field day and accidently tune across one of the
| other stations there, you would be glad to have the mod installed ;-)
|
| 73,
|
| Fred
|
| _______________________________________________
| Elecraft mailing list: [email protected]
| You must be a list member to post to the list.
| Postings must be plain text (no HTML or attachments).
| See: http://mailman.qth.net/mailman/listinfo/elecraft
| Elecraft Web Page: http://www.elecraft.com
|
|