Jim,
I am looking at the XV transverter Owner's manual Rev F1 and cannot
understand your statement about the ACC cable. See Figure 7 on page
11. It clearly shows 4 wires to the ACC connector, and one of them (pin
1 of the XV144 DB-9 connector and pin 12 of the K3 ACC end) is the
return path.
I am also concerned about your statement about the "right" level drive
to the XV144. In the XV144 there is no provision to switch in any fixed
attenuation.
Are you certain you are looking at the XV Transverter Owner's manual and
*not* the K144XV internal option for the K3.
As for frequency stability of the XV144, without the crystal oven, the
XV144 is usually stable enough for CW and SSB operation. If greater
frequency stability is desired, the addition of the crystal oven is
desirable. Plug the JP-9 header to pins 4 and 5 to provide power to the
LO and xtal oven at all times that +12 volts is supplied to the XV144
for the greatest LO stability.
73,
Don W3FPR
On 7/25/2014 6:36 PM, Jim Brown wrote:
I've reclaimed an XV144 that I bought used in 2005 and have never used
from a friend to whom I loaned it. I'll be using it with a K3, that
will be dedicated to 2M. I'm told that frequency stability is a
concern, and that it's important to drive it at the "right" level so
that fixed attenuation is not switched in to protect the TX input. The
question is, what is the "right" level to minimize dissipation inside
the XV144? So far, I haven't found that in the manual or the specs.
Another observation. The latest manual for the XV-series converters
contains another massive goof in the wiring of the AUX cable. It shows
only two conductors with no return, depending on the coax to carry a
return signal. That's fine for DC, but our stations produce RF, so the
large loop formed by the coax and the control lines is a big antenna.
TILT!
Time for another manual re-writing. And to fire the guy who conceived
the drawing.
73, Jim K9YC
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