I just checked on my spectrum analyzer and found no spur at 11.8 MHz at any
power level on my O2. I used a 5-foot dipole outside about 75' from the
antenna, which is hardly a laboratory-grade test set up, but I'm sure I
would have seen something if it was there. I did find the IF leak at 12.105
MHz, but it was -50 dBc, well within the requirements, if there was any
accuracy at all to my test setup. The preferred test method would be
running into a dummy load through a Bird wattmeter using a calibrated
sampling slug.
Ron N6AHA
----- Original Message -----
From: "Trevor" <virago@wildblue.net>
To: <tentec@contesting.com>
Sent: Sunday, July 09, 2006 11:02 AM
Subject: [TenTec] Orion-II 15m TX Spur?
During the checkout of my new O-II I observed a significant spur on
11.8mhz while transmitting on 21.105mhz
under the following conditions:
Barefoot - no linear amp.
"Out of the box" default settings - both VFO's on 21.105mhz - mode LCW
on both - (A or B has the same spur)
Tune - advance power level from 1w to 55w spur is ~30db down - spur
disappears at 50w through 100w.
With amp (SB-220 or HF-2500) at 1kw there is no 11.8mhz spur however
should I wish to run QRP or reduced power up to 55w barefoot I have the
spur.
My spectrum analyser is 3 feet away from the rig so I took it to another
part of the house and saw no difference in the spur amplitude.
Anyone else see this? No spurs found on any other bands but have'nt
completed my checkout yet.
-Trevor AB5EU
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