Augie Hansen wrote:
In line with what others have already mentioned, my K3 (S/N 441)
exhibits a noticeable reduction in the peak power output level on
voice compared to CW output, but it also varies as a function of the
selected sideband. Jim, W7ZQ has found this to be true with his K3
(#28) also. Output is lower than requested peak power on USB by some
15-30%, with LSB being lower by as much as another 20%. My K3 has the
2.8KHz filter and Jim's uses the 2.7HKz filter. The differences noted
are consistent for all bands.
We discovered that the TXG VCE menu entry wasn't functioning correctly.
When we post the next update, try setting TXG VCE to about 1.0 dB. The
difference between LSB and USB should be a small fraction of a dB,
although it will vary a bit from one filter to the next due to slight
passband ripple. An extreme amount of variation might indicate a
problem with that filter.
Also, I have rerun the transmit gain setting procedure several times
and noted that the VFO A frequency is no longer displayed when the
TXGN menu is selected.
This hasn't been the case for quite awhile. But you should rarely need
to access this menu entry anyway. You can do power calibration without
being in the menu or selecting this entry. Just set it to 5 W, do TUNE
into a dummy load on each band, and repeat at 50 W.
In addition, when I select the 80 meter band, the frequency display
area shows "Pr80" during the HP calibration (but not for LP). Nothing
shows for any other band selection. I can't find any description of
this item. What does it mean?
This indicates that the preamp is in use during transmit mode (recall
that the K3 has a reversible IF strip so that the low-noise
preamp/mixer/postamp can be used in TX mode as well). The ability to
turn the preamp off on 80 meters sometimes comes in handy for
troubleshooting. This will be noted in the next manual update.
73,
Wayne
N6KR
---
http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
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
