Put me in the I love my Orion camp because it has the best receiver I
can get.
I never thought I would get sucked into the AM discussion. But I hooked
up the dummy load, 2 different power meters in series on my Orion
(original) with 2.056 software.
AM mode. My data is not the same as Grant showed (quoted below my data).
My meters are not accurately calibrated per a standard but are in the
ballpark perhaps as much as 20 % low. Carrier power AM mode, 99W output
setting, no modulation. Auto Tuner disabled.
My data shows there is up to about a 4 second convergence time for the
power to slew to the proper level after a band change. The fall time
constant of my analog meter is less than 1 second. There is a problem
(see *** below) as the power can be way too high for a significant time
on the initial ptt after a band change. This behavior might be hard on
some amplifiers.
KH7T data
Meter 1 is LDG DWM4 digital, Meter 2 is analog.
Band Meter 1 Meter 2
160M 15W 20W *** note below. Do not trust meter 1 on 160.
75M 19W 20W ***
40M 20W 18W ***
20M 19W 19W ***
15M 18W 16W *
10M 19W 17W *
*** If the 160 meter test is done after the 10 meter test, the Reading
starts at 61 watts and moves gradually down to the value shown above in
about 4 seconds. If the 80 meter test follows the 10 meter test the
initial value is 80 watts. This is not just an instantaneous
millisecond pulse. Similar results 10 or 15 meters to 40 or 20 meters.
I can avoid the excessive power startup if I tune the auto tuner after
band change. I would not want do that if I had resonant antennas (or no
auto tuner).
* There is a 4 second rise from 7 watts on the first Ptt after band
change moving up the bands from 160 to 10.
Aloha,
John KH7T
------------------------------------------------------------------------
Subject:
[TenTec] Orion II 2.033 AM Transmit Output
From:
"Grant Youngman" <nq5t@comcast.net>
Date:
Mon, 1 May 2006 09:18:27 -0500
To:
"'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
To:
"'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
I rechecked the carrier level output on several bands this morning on AM.
It should automatically set to approximately 25 watts (or about 1/4 of the
power at full output). This is what it is doing:
160M 30+ W (too high to achieve 100% modulation)
80M 10 W
40M 5 W
20M 2-3 W
15,10M 2 W
Some have reported output as high as 50 watts -- maybe that is a reference
to peak output with modulation? The carrier output level on 160M is too
high to be able to achieve 100% modulation given the output capability of
the Orion II.
Grant/NQ5T
------------------------------------------------------------------------
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