Thanks Joe for a very helpful note. This will materially aid my 'birdie
hunting' when I upgrade S/N 4474 with new synths and internal preamp in a
couple of weeks time.
73 Dave G3WGN M6O WJ6O
--
View this message in context:
My K3 with the new synth (and upgraded DSP board) has an unfortunate birdy
on 50.276 (unfortunate because this is the JT65 calling frequency in the
US). I know it is a DSP-type artifact because the pitch of the birdy
changes with the IF Shift control. The IF shift control does not change the
The spur also changes with bandwidth. In my K3 it happens to fall at
50.279.00 with FC=1.50, BW=2.80 in DATA_A when the rig is at 50.276.00.
When going to FC=2.20, BW=4.00 the spur moves to ~50.285.5 and in
USB NORM it falls at 50.275.71 (zero beat). Again, this is fortunate
in that the spur
Is there anyone out there yet who has done a detailed study of 6m birdies with
the new synth and either external or internal preamp? A good friend with an
early K3 is reluctant to upgrade to K3S as he hears a couple of dozen birdies
on 6m with antenna disconnected.
So how has this aspect of K3
David, Your friend states there are 2 dozen birdies on 6 meters with the
antenna DISCONNECTED. This tells me nothing. Please tell him to connect a
RESONANT 6 meter antenna to the radio then tell me how many birdies he hears.
73, Brian K3USC
On Jun 23, 2015, at 1:41 PM, Wayne Burdick
David,
When we designed the K3S, we very carefully evaluated internally generated
spurs on all bands. We found that the KSYN3 and KSYN3A had roughly the same
number. This is consistent with both being high-level signal sources; you can't
get rid of spurs entirely. All but a very few are masked
Yes indeed. Checking for birdies or any such with an unterminated antenna
jack is invalid. You can terminate with a dummy load, or more practically
with an antenna listening to normal band noise.
73, Guy K2AV
On Tuesday, June 23, 2015, Brian Hemmis bhem...@mac.com wrote:
David, Your friend
...@aslinvc.com
Subject: Re: [Elecraft] 6m birdies and K3S and/or new synth boards
Yes indeed. Checking for birdies or any such with an unterminated antenna jack
is invalid. You can terminate with a dummy load, or more practically with an
antenna listening to normal band noise.
73, Guy K2AV
On Tuesday, June
)
To: David Aslin G3WGN da...@aslinvc.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 6m birdies and K3S and/or new synth boards
David,
When we designed the K3S, we very carefully evaluated internally generated
spurs on all bands. We found that the KSYN3 and KSYN3A had roughly the same
number
On Tue,6/23/2015 10:44 AM, Brian Hemmis wrote:
David, Your friend states there are 2 dozen birdies on 6 meters with the
antenna DISCONNECTED. This tells me nothing. Please tell him to connect a
RESONANT 6 meter antenna to the radio then tell me how many birdies he hears.
It tells me a LOT.
10 matches
Mail list logo
