[Elecraft] P3 lost receive signal on monitor from K3s

[Ron D'Eau Claire]

I understand that the center pins on 75-ohm BNCs are a different size from
the 50 Ohm version. Mixing them up can damage the female connectors and
cause intermittents. 

73, Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred
Jensen
Sent: Sunday, March 5, 2017 3:00 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] P3 lost receive signal on monitor from K3s

Had this problem originally with my P3. Things to look at:

All BNC connectors are not created equal.  This is especially true if they
were born in "you know where."  Center pins aren't always the correct size
or length.  It is very hard to verify they're good.  Try a different cable.
Several years ago when the P3 was fairly new, Elecraft got a batch of cables
from a vendor that were basically all bad.  They replaced mine on the
condition that I cut the bad one into little pieces so it didn't end up on
some hamswap table. [:-)  I'm sure they're all gone now, but try a different
cable.

The P3 is basically a receiver.  Normally for a K3/K3S, it will be tuned to
the K3 1st IF at 8.1xxx MHz, however it can be tuned to a wide range of
frequencies to accommodate other transceivers.  Put a piece of hookup wire
into the center pin of the P3 BNC socket. You should be able to see noise
and it should just about go away when you remove the wire.  If this is true,
your P3 is probably OK.

Is your P3 tuned to the K3S's 1st IF?  It's part of the set-up in the
manual.

Make sure the male BNC connectors are not oxidized.  P3 seems to be fairly
sensitive to problems in that connection.

I have an early K3 and needed to order the one-resistor mod to boost the IF
level.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County


On 3/5/2017 1:59 PM, Bill Johnson wrote:
> I looked in archives but found nothing.  I can find low level noise but
nothing coming from K3s. I have checked all cables and all is working fine.
> Suggestions from anyone who has had the experience and fixed it.
>
>
> 73,
> Bill
> K9YEQ
>

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