LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #2   Report Post  
Old January 19th 07, 03:51 AM posted to rec.radio.shortwave
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 4,494
Default diversity reception notes

In article . com,
wrote:

I must be doing something wrong.

Frequency 6.486MHz (BTW arabic male)

I first tried 2 active dipoles seperated by 100' on a north to south
line. Next I tried a 50' wire 6' off the ground with a WinRadio
WR-LWA-0130 "long wire adpator, with either of the active dipoles,
then I ran another 50' at right angles for the first, also with a
WR-LWA-0130 and tried them all with my Mini Circuits ZFSC-2-1, that
while rated for 5~1000MHz operation has been tested and it works fine
down to well below 100KHz.

The nulls we less frequent but much deeper when they came.

I then used a 2nd R2000 and fed each receiver with different antennas
and just let the audio "mix" from the respective speaker outputs. The
active dipoles gave the best overall effect. There was a very
pronounced comb filter effect kind of like The Small Faces "Itchycoo
Park" from 1967, or Gobi Grant's "The Westward Wind".

Not too bad I think I will investigate some more this weekend.

At this point a couple of active dipoles into a broadband "phaser"
allow me to peak the signal and that works better the diveristy. Now
what would happen if I had 2 sets of active dipoles feeding seperate
phasers feeding seperate receivers?

I can get at the AGC in my R2000 fairly easily and it should be
fairly simple to build a comparator to pass the strongest signal to
the audio chain.

Just what I need another radio project.


For diversity reception you "switch" to the best signal instead of
mixing them together.

The best approach is two antennas with plus 1 wavelength between them
into two separate receivers and switch the audio between them based on a
decision circuit looking at both radios AGC voltage.

--
Telamon
Ventura, California
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The "Green" Antenna for AM/MW Radio Reception plus Shortwave Too ! RHF Shortwave 0 January 10th 07 01:21 PM
AM (Medium Wave) Radio Reception - Tips and Links RHF Shortwave 0 April 21st 06 06:01 AM
Automotive Diversity Reception problems- 98 Corvette Eric Antenna 1 January 28th 04 10:19 PM
Poor quality low + High TV channels? How much dB in Preamp? lbbs Antenna 16 December 13th 03 03:01 PM
Poor quality low + High TV channels? How much dB in Preamp? lbbs Shortwave 16 December 13th 03 03:01 PM


All times are GMT +1. The time now is 12:55 PM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017