10368 MHz EME

NOTE: Design and construction of a 3 cm EME rig is ongoing. I will update this page as the work proceeds.

The antenna for 10368 MHz EME is my 5.5 m dish with a f/D of 0.366.

SM6FHZ 3cm RF-head         3cm RF-head during construction

SM6FHZ 3 cm RF-head interior       Interior of present 3cm RF-head during construction. Ready for receive.

SM6FHZ 3 cm EME dish     5.5 m dish with 3cm RF-head

SM6FHZ 10 GHz RF-head in dish    3cm RF-head in the dish

I am using the SM6FHZ 5 step septum feed horn (0.760 wl wave guide) for circular polarisation on 3 cm EME. Designed by SM6FHZ and built by SM6PGP.

SM6FHZ 3 cm feed SM6FHZ 5 step septum feed horn for 3 cm 

SM6FHZ 10 GHz EME rig and PSU     3cm transverter on top of the 6 cm transverter and the power supply

SM6FHZ 3 cm Rig    3cm transverter

Equipment on 3 cm EME:

Antenna: 5.5 m solid dish, 0.366 f/D (SM6FHZ EME dish) giving 0.37 deg half power beam-width

The 6 cm RF-head is situated at the focal point of the dish and contains:
Feed: 5 step septum in a circular WG and using a Kumar choke (SM6FHZ design and built by SM6PGP) 
PA: TGA 2312-FL GaN transistor amp by G3WDG, giving about 35 W at the feed driven by one Mimix1006.
LNA: Home made dual stage LNA with 1.5 dB NF and 24.5 dB gain driving a post-amplifier Avantek SA83-0282M 10.95-12.75 GHz 38 dB gain and 2.6 dB NF at 10368 MHz.
Transverter: SM6FHZ ancient 3 cm transverter with a G3JVL mixer in the shack giving 0.5 W to 16 m of 1/2" Heliax cable to the RF-head (~50 mW available at the RF-head)
Auto moon tracking with a OE5JFL controller.

Sun noise on TBD 2015 (flux = TBD): TBD dB and more than TBD dB of moon noise (2015-TBD, moon distance ~TBD km). Cold sky to ground is slightly more than 3.5 dB.

Measurements on 3 cm EME:

    3cm Moon noise on September xxth, 2015

    3cm Sun noise on September xxth, 2015

Example of spatial polarisation from SM6 to selected parts of the world across a full Moon pass:

Spatial polarization in SM6

The data was collected by using VK3UM EMEPlanner and checking the mutual polarisation hour for hour for each path. The spatial polarisation rotation is a slow and predictable process so one sample every hour would be sufficient in order to see what is happening.

One conclusion that could be drawn from the above table is that many stations would benefit from using circular to circular polarisation in a contest scenario, with many stations from different parts of the world QRV at the same time. The time available for QSO's would increase and a lot of uncertainties would vanish. 

SM6FHZ 10368 MHz EME initials list (2015-TBD), all worked from JO57XJ:

To be continued........


Updated September 13, 2015.              http://www.2ingandlin.se/SM6FHZ.htm