[Moon] EME Status Update

Edward R Cole kl7uw at acsalaska.net
Thu Mar 12 17:43:10 CET 2015


Recent work on 2m-eme:

I removed my secondary TR relays (HP8765A) as unnecessary for 
isolation since the primary relays (NARDA) exhibit over 100-dB.  This 
eliminates a little loss ahead of the preamps and a potential failure 
point (relays powered-on in Rx).  I kept my RG-142 double-shielded 
coax jumpers between TR and preamp.

2m-eme is QRV with 4x XP20 + 1300w
----------------

Work on 23cm-eme is almost finished:

new LNA enclosure installed and Rx operational.  Rx/Tx isolation 
tested thru the TR relay with no RF sensed by my HP432A at -20 
dBm.  Horizon ground temp/50-ohm termination sees 1.5-dB difference 
and MAP65 sees about 24-dB audio baseline over 8-dB soundcard noise 
floor.  I will probably monitor the 1296 eme band with my SDR-IQ.

30w driver is installed and tested and have run the 150w amp at 120w 
(so far).  I will test more today to see where saturated output 
falls.  Couple minor ckts to hook up for monitoring in the shack (Ipa 
and PS monitor LED).

I have one wheel to reinstall on the dish to make it fully functional 
for azimuth movement.

I expect to have all completed by end of day.  Lunar declination is 
too low for eme at the moment.  After high sun noise next weekend 
(1900utc March 21) should be QRV 23cm with at least 120w (hoping for 
more).  Moon elev >10 degrees limitation due to trees.

23cm-eme: 4.9m dish (W2IMU feed) with G4DDK LNA + 120w+  CW/JT65c

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com



More information about the Moon mailing list