- Hy-Gain TH-7DX 3-Band vertical beam -
The TH7DX first 'flight' @ my QTH, OKTOBER-24 2003
It looks like the antenna is working, after nearly 30-years of usage. I disassembled the antenna, with the traps and everything. I then re-assembled it according to the original manual.
The initial test-run only tells me that the SWR is according to specifications, a little high on 20meter, but i think this is due to ground reflection, the antenna is now only about 12 meters above ground and only 6 meters away from a metal roof...
I will trye to get better location for the antenna, and also some real compare usage on the bands, so fare it gives higher S-readings on some signals comming in with low angle (DX) from short-path beaming north/west for USA/Canada, This is al i know at present time.
The TH7DX on home-made crank-up tower 13meter above ground
- Documentation -
FACTORY SPECIFICATIONS
========================================
Frequency coverage..10/15/20 Meter Amateur bands
Power Handling......Maximum legal power (USA)
Impedance...........50 ohm
Gain................8 / 8.7 / 9.6 dB
Connector...........SO239
Dimensions..........7.32 meter (boom)
9.45 meter (reflector)
Weight..............34Kg
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©1999/2000/2001/2002 SM2YER Goran