[Elecraft] K144XV Strange Readings

[WW2R Elecraft]

Both my early edition K144XV were not unconditionally stable and were swr
intolerant

I think you will find that the 3:1 swr is because it is oscillating "out of
band". Try listening on a scanner. I have experienced this on my two k144xv
and g4ddk had the same issue with his. One example produced 162MHz, one
168MHz one around 158MHz. When you tune or speak it stabilizes and generates
on 2m   My k144xv were fine if I operated at the bottom end of 2m where the
swr was 1.1:1 but my antenna swr rose to 1.6:1 at around 144.8MHz  and above
this point it showed the instability you mentioned


Mine were replaced with the later production run k144xv (the one without the
centre spacer, but that could just be coincidence!) and the issue has not
arisen since

Dave

G4FRE



 

Message: 19
Date: Fri, 17 May 2013 05:26:24 -0500
From: Michael Eberle <mteberle at mchsi.com>
To: Elecraft at mailman.qth.net
Subject: [Elecraft] K144XV Strange Readings
Message-ID: <519605D0.20209 at mchsi.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I've noticed strange behavior on both the W2 watt meter and a 
cross-needle meter when using my K3 on 2 meters.  Just curious if anyone 
has had problems like this?  In SSB mode, keying the mic without any 
audio causes the watt meter to show about 3 watts output power and 3:1 
SWR.  However If I hold the TUNE button and put out a carrier It shows 
the expected 7-10 Watts forward with normal low SWR.  It also appears to 
show normal readings while speaking into the mic, but goes to the 
unusual readings with in between audio peaks.

Thanks
Mike KI0HA