| VK3NX Australian Amateur Radio Station |
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Equipment on 3cm
- A homebrew transveter based on the DEMI board is used
for the 10 GHz transverter. The transverter is used as my
"terrestrial" transverter and incorporates a homebrew 3W
amp and the DEMI 8 W amplifier. There is provision for a
low level (+10dBm ) output on the rear panel which when
selected disengages the internal PA's. This low level RF is
used to drive the EME TWTA.
- The TWTA is an NEC which produces 100 W RF on
10368MHz and with the associated piece of LMR600 I am
getting about 75-80W at the feed of the 3.7m dish.
-The LO is a homebrew design utilising the circuit in the
"ARRL Microwave handbook" as the basis and is locked to
a GPS derived 10 MHz signal with a "VE1ALQ" PLL board.
-LNA is a DB6NT preamp. Measured NF is 0.7dB and the
gain is 26dB
- A W/G switch is used with a simple feed horn utilising a
single "VE4MA" style choke flange. 1 W/G to SMA
transition exists on the input to the preamp.
- IF frequency is 144 MHz.
- A homebrew transveter based on the DEMI board is used
for the 10 GHz transverter. The transverter is used as my
"terrestrial" transverter and incorporates a homebrew 3W
amp and the DEMI 8 W amplifier. There is provision for a
low level (+10dBm ) output on the rear panel which when
selected disengages the internal PA's. This low level RF is
used to drive the EME TWTA.
- The TWTA is an NEC which produces 100 W RF on
10368MHz and with the associated piece of LMR600 I am
getting about 75-80W at the feed of the 3.7m dish.
-The LO is a homebrew design utilising the circuit in the
"ARRL Microwave handbook" as the basis and is locked to
a GPS derived 10 MHz signal with a "VE1ALQ" PLL board.
-LNA is a DB6NT preamp. Measured NF is 0.7dB and the
gain is 26dB
- A W/G switch is used with a simple feed horn utilising a
single "VE4MA" style choke flange. 1 W/G to SMA
transition exists on the input to the preamp.
- IF frequency is 144 MHz.
| 3cm EME |
NEW FEED WITH SUPER VE4MA CHOKE FLANGE FITTED JAN 2015 Sun Noise = 14.8 dB (SFU = 148) Moon Noise = 1.65dB CS / Gnd = 4.2 |
Audio Clips of 3cm EME: |
| RW1AW |
| Recordings taken at JA1WQF... on 2.4m dish (Thanks Mitsu) |
VK3NX received at JA1WQF
| OK1KIR - VK3NX QSO |
| Using a Large bolt of 22mm diam, (0.77wL), shaped to a point over ~ 2wL, the WR75 Waveguide piece was heated and flared out to circular. A 3 screw tuner (utilising only 2 screws) was used to achieve a 25dB RL. A Super VE4MA choke flange was fitted and adjusted for best illumination. This feed produced about 0.25dB more moon noise compared with the original feed which utilised an "original" dimensioned VE4MA choke flange. |
My Echoes on 3cm
HB9Q SSB