I read somewhere that one test for a receiving antenna is to compare the
received noise floor against no antenna, during the day with little
atmospheric noise. There should be a *slight* lift in the noise when the
receive antenna is connected. This is as little as 2-3 dB at my QTH, a
rural area.
My Beverages are 270 metres long, made of galvanised steel fencing wire,
on runs of RG-6 out to about 300 - 400 m. Output is typically just above
receiver noise floor during the day, maybe -125 dBm. At night, I see 20
dB or so more signal + noise on my dipole or vertical than any of the
Beverages. I can hear better on my Beverages than on my beams on 40 and
30 m.
Previously, I ran a EWE array, with even lower output, but it was still
very useful. Receivers have far more gain than we need on the lower
frequencies.
I have had a little bit of experience with short Beverages, on
DXpedition. Even at the length of yours, they were quite useful. The
only problems we've had with short DXpedition Beverages, is when cattle
knocked the poles over, or pulled the wire out at the end!
73,
Luke VK3HJ
On 1/07/2020 4:56 am, Mark Lunday wrote:
"Beverages just want to work" is what I have heard.
Not having much luck with that here. I suspect operator/installation error.
I did a lot of reading and I must be doing something wrong.
* 250 feet of insulated wire strung out in 030 degrees direction toward
EU, pretty straight, varying in height from 4 to 6 feet, running through thick
brush with no metal objects or artificial elements along the run.
* 9:1 transformer at feed point with ground rod
* 300 feet of coax, mix of
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|