K7XQ 10 GHz ( 3 cm ) Microwave Page
4 foot tower mounted dish
Waveguide ( round ) is a 65 foot run of 3/4 inch copper pipe ( found at virtually any hardware store ) 3.2 db of total measured loss including right angle bends.
SMA launch at both ends of waveguide provide RF interface ( photo not too good )
It uses a standard flange mount SMA connector positioned at a fixed offset away from the end of the pipe cap end. The center conductor protrudes into the copper pipe as a RF launch ( @ 0.25 inches ). Standard threaded screws are placed at one or two locations near the launch to provide a SWR matching. Rotating the end launches provide further matching when everything is connected together.
20 watts of RF power are provided from a surplus Varian TWTA. These can be found at some swap meets and on e-bay.
Useful formulas
f/d: The distance between the back inner center of the dish to the point where the RF input/opening to the feedhorn is to be placed.
f/d = (diameter * diameter ) / 16 * depth of dish measurement in inches
The f/d ratio is usually between 0.3 and 0.5.
f/d 0.3 dishes are considered deep dishes. Feed placements are much closer to the dish.
f/d 0.5 dishes are considered shallow dishes. Feed placements are much farther away from the dish.
K7XQ 10 GHz Terrestrial Log ( 24 inch dish / 10 W )
| Callsign | Date | Time | Mode | Grid | Distance ( miles ) | Location | Name | Notes |
| KK6MK | 08-17-2008 | 0229 | SSB | CM97fs | 57.9 | Tracy,CA | Rex | |
| K6GZA | 08-17-2008 | 0253 | SSB | CM98wj | 76.9 | Mt.Vaca | Ron | 15 W 4' dish |
| WA6CDR | 08-17-2008 | 0454 | SSB | DM04ms | 201.1 | Mt. Frazier | Robin | 10 W 6' dish |
| N6LL | 08-17-2008 | 0506 | CW | DM04ms | 201.1 | Mt. Frazier | Paul | 250 mw 4' dish |
| KB8VAO | 08-18-2008 | 0326 | SSB | CM96in | 65.9 | I-5 | Steve | mobile omni slot ant |
Local beacon frequencies: ( click on beacon for pictures):
Mt. Frazier N6CA 10368.3101 MHz DM04MS
Mt. Palos Verdes N6CA 10368.3000 MHz DM03TS
Mt. San Miguel WB6IGP 10368.0700 MHz DM12MQ
Santiago KE6JUV 10368.3300 MHz DM13FR
Mt Allison AD6FP 10369.1500 MHz 37-29.905 N, 121-52.206 W
Mt Vaca W6ASL 10368.3250 MHz 38-24-51 N, 122-06-50 W
Mt St Helena KF6KVG 24191.9900 MHz 38-39-22 N, 122-37-0.9 W
Mt Allison W6QI 24192.0100 MHz 37-29.905 N, 121-52.206 W
SP7JSG 3 cm EME Page ( with sound files )
G4NNS 3 cm EME Page ( with sound files )
F5JWF 3 cm EME Page ( with sound files )
This page was prepared on 08-24-2008
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as of
August 24th 2008