January 27th 04, 09:50 PM
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will do
Jeff
"RHF" wrote in message
m...
JEFF-UK,
WHAT TO DO: Select from three to five strong International
Broadcast Stations on Each Band: 120M, 90M, 75M, 60M, 49M,
41M, 31M, 25M, 22M, 19M, 16M, 13M, and 11M.
* Record your S-Meter readings for these Stations and
Time of Day/Night.
* De-Tune by 5-15 kHz to a 'dead-spot' on the band and
also record your Background Noise Level for the Band near
each of these Stations.
iane ~ RHF
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= = = "JEFF UK"
= = = wrote in message ...
No. I just know 20 mtrs is very noisy here.
Now its much better on a signal to noise ratio.
Every thing appears to be the same signal strengh on know frequencies.
Cheers
Jeff
"RHF" wrote in message
m...
JEFF-UK,
QUESTION - Prior to 'making' your Changes did you do any Reception
Testing and Record your Results ?
FWIW - Our Memories are "Poor-Recorders-of-the-Facts: When it
comes to all the 'factors' that make-up the Ojective Evidence
and Subjective Judgements like a Radio Broadcaster's Signal
Strength and the Background Noise Level {Signal-to-Noise Ratio}
of a Shortwave Band.
* Now multiply this by five to ten Broadcasters per SW Band.
* Then multiply this by five to ten SW Bands.
You now have 50 to 200 Observations to Memorize or Record.
I 'favor' the "Write-It-Down" Method.
Read Message # 556
Your ANTENNAS Journal-Ledger and Understanding the Shortwave Bands
http://groups.yahoo.com/group/SWL-AM...na/message/556
Read Message # 88
Hooking-Up a "Balun" [Matching Transformer] to a Random Wire Antenna
http://groups.yahoo.com/group/SWL-AM...nna/message/88
More Balun (Matching Transfromer Reading:
* MLB Theory
http://groups.yahoo.com/group/SWL-AM...na/message/340
* Magnetic Longwire Balun (MLB) - Help !
http://groups.yahoo.com/group/SWL-AM...na/message/173
* Magnetic Longwire Balun (MLB) - Build Your Own "DIY"
http://groups.yahoo.com/group/SWL-AM...na/message/177
* Balun / Matching Transformer Reading List ( Long 43 Links )
http://groups.yahoo.com/group/SWL-AM...na/message/337
iane ~ RHF
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Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/SWL-AM...na/message/502
I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond !
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= = = "JEFF UK"
= = = wrote in message ...
Hi.
Further to my last post............
This weekend i messed about with my long wire receiving ( only )
antenna.
( Length 20Mtrs, coax fed , earthed 10 mtrs from house).
Yesterday i built a 9:1 balun / transformer.
Placed it at my earth rod out side.
I am not even sure if this is the right one for a long wire ?
Anyway.. reception on 20 mtrs now has much less noise now.
The signal to noise ratio has vastly improved.
Reception on other bands remains about the same as before i added
the balun.
(I used my Wellbrook loop antenna to compare signals.)
My question now is...
How do improve reception/noise on other bands ?
Do i need a different balun or change the length of my wire ?
What ever i have done seems to of peaked on 20mts ( 14Mhz).
It would be great to get rid of the noise on 80mtrs for example.
Any ideas or diagrams appreciated.
Interesting stuff this !
Regards
Jeff
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