OK1KIR
Report from 2nd 10 GHz polarization test held on April 28, 2006 

TX station:
IQ4DF 7m dish, linear polarization, QRG: 10368.150 MHz, TWT 200W, 2006-04-28, 16:00 … 17:00 UTC
Records of received signal:
Two audio files recorded when rotating linear polarization feed in 10° steps.
The first file consists of 10 audio sequences starting at -90° up to 0°.
Second file consists of 8 audio sequences starting at +90° up to +30°.
The last section of the second file, is SSB signal of IQ4DF at the end of their transmision.
Sequences in both files are separated by zero signal breaks. 
Files are available on: http://www.qsl.net/ok1vao/10GHz_pol_test/20060428_IQ4DF/

The 0° position equals to vertical position towards local ground surface.
Antenna (dish) controlled by Az-El tracking with accuracy better than ± 0.1 deg.
Measured BW(-3dB) ≈ 0.5deg at 10.368 MHz.
Rig settings:
IF - TS870: USB, DSP BP: low=100 Hz, high=1400 Hz, AGC off, rf and nf unchanged through the whole test, audio output monitored in parallel by an audio meter. 
Frequency tuning slightly corrected each sequence to compensate Doppler with the aim to held signal audio frequency close to 1 kHz.

Rmk:
Corrections of antenna beam pointing when rotating the feed, necessary in the previous test, were eliminated by placing the whole gear box in the proper position (it was implemented in wrong position – reversed by 180°, hi) so no more correction were required.

System parameters (measured before and after the test):
Moon   cca 1.7 - 1.8 dB

Equipment used:
Dish 4.6m, f/D=0.43
Feed: long pyramidal horn (refl. <-20 dB) mechanically rotating by +/- 90° with remote step indication of each 10° position 
LNA: 3 stages, NE32584 (“D”) on the first stage, NF ≈ 1 dB not measured (was <0.8dB some years ago before two replacements of damaged input FET)
Home brew TRX 10368 and 10450/145 MHz based on DB6NT kits + 145/28 DEM transverter  
IF RX: Transceiver Kenwood TS870S 28 MHz 

OK1KIR EME team:
Tonda-OK1DAI, Vladimir-OK1DAK, Jan-OK1VAO 

2.5.2006