Sonet the afternoon experimenting with
some new ideas for a feedline. We tried
shielded and unshielded (lamp cord).
The unshielded was bad. Very bad.
The shielded was the best, from a low
ingress, or no signals from my radio
pc getting back into the antenna.
Got ot: members.aol.com/WA1ION/nrants.pdf
to see the basic setup. I halved R1 and put
5 Ohms in series with each side. The 270 Ohm
does make a clear difference in this application.
I grounded the shiled at the antenna only.
The shield made no connection at the 1:1
transformer end. Both of the inner balanced pair
were connected to the 1:1 and brought into the radio
room as shown. The 1:1 is mounted in an altoids tin
that is grounded to the bulkhead outside my radio room.
No cable is grounded at thet end.
There was no trace of birdies from my PC, infact there
was a minimum, much less then before, of impusle static
when I turned lights on and off.
The TV/VCR/DVD produced no birdies. Themicrowave did jam
everything.
This cble was so old that the printing was so faded that
we couldn't read the cable number. I will try to find
a comparable smaple and report the number here/
At this point I have to say that a shielded balanced
feedline is much better then anything else Ihave tried.
Microphone cable was dead. With it I got NO signal at
any freqeuncy.
Terry
The standard members.aol.com/WA1ION/nrants.pdf connection
is a great feed system and makes and ideal starting point
for any serious antenna experimentation.
Terry
---------------------------
Email no longer checked due to terrific spam,
and some serious hate mail. Someone in this
NG hates the idea of using a matching transformer
ona recieving antenna. Their loss.