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My
first JT65 QSO on 1296 MHz ever.
Rex VK7MO has small dish and around 150W RF power. Using
septum feed a TVRO on balcony. Picture and more details here with QSL
from Rex. Signal was speaker copy and possible to work CW easy.
Good way for small stations how to work via Moon on 23cm too.
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Here you can see on the
Spectran, how is signal drifting due to Doppler. With last version of
JT65 is decoding signal -17dB and spectran much better visible.
Great job of Joe K1JT
Here is the .wav file
for possible downloading and try to decode in your PC or try to hear
speaker copy signal.
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VK7MO
description
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2.3
m TVRO mesh dish with square Septum to OK1DFC drawings and Super
VE4MA choke ring as per latest article from W1GHZ. Dish is aimed
manually with 3xJack screws either by lining up with moon visually
or with a protractor and carpenters roofing level if moon is
obscured by cloud. The reason for 3 jack screws is:
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For
elevation
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For
azimuth with variable fixing points to cover NA and EU windows
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For
height to get above balcony rails at low elevation.
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Towards
EU I am obstructed by my own house and also trees so I can only get
a good window when the moon is at Northerly declination 23 to 25
degrees and between 215 and 230 west above 12 degrees elevation at
my end. So Eu contacts are restricted to a few hours per
month. Dish lays flat and is moved back against house when not
in use so it is visible to neighbors. The station must be set up for
each sked. The shack is 20 meters away at back of house so I
must walk through house to direct antenna every few TX/RX periods.
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IC-910-H
which is GPS locked. The 30.2 MHz reference for IC-910-H is
provided by a HP 3325a synthesizer which is locked to a HP Z3801a
GPS frequency reference. Measured drift against a Rubidium reference
was 4 milli-Hz at 1296 MHz over 2 months.
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Pre-amp
is a Kuhne MKU 131 AH
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PA
is Kuhne MKU 13200 A, power to feed is 100 watts
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I
have worked HB9Q, K2UYH, VK4AFL, VA7MM, VE7BBG, W5LUA, WW2R, G4CCH,
OE9ERC, VE6TA, SM5LE, JA6AHB, OK1KIR, OH3MCK, OK1DFC on JT65c and
WA6PY and G4CCH on CW.
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My
smallest station is OH3MCK who was using 27 dBi horizontally
polarized Yagi or equivalent of 24 dBi to my circular polarization.
I have worked VK4AFL (3.7 meter dish) at 10 watts and he can copy me
at 5 watts. My interest is in QRP EME and I need to find the
extra few dB on RX. I think the secret to QRP EME on 1296 is
frequency stability as provided by my GPS locked system. I would
like to carry out my QRP experiments with other GPS locked stations.
The next step is to compensate for Doppler shift so I need some help
to find a program that will correct the tuning of my IC-910-H for
Doppler.
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