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In Reply to: RE: Instead of how many tuners? How many of you have a good antenna? posted by Timbo in Oz on February 24, 2016 at 01:58:10
OK Timbo-San, antenna challenge accepted this afternoon.
Decided to try my apartment dwellers best. 6 footer on the
Library table and I went from 61 to 64 on my RBRX1 signal
readout. Max is 80. Multipath reads 11. The 61 score is from
a circular closet mounted antenna. Both sound pretty good
at that level.
Not to be denied I took out the dreaded Signal Sleuth.
I have rejected it many times before. Today I installed
it half way to the receiver, in a different room, different
Power outlet, and with some mild conditioner. A bit of
Boost, and up to 80 with ease. 4 hours of listening to
WFMT, and guess what, my ears are not bleeding.
Perhaps the Sleuth is not so evil if applied to an already
decent signal.
Makes me think that working out a very clean power supply
for the sleuth might be a good idea. Perhaps even battery.
Working with the fm signal is perhaps as delicate as the
digital realm. The guys over on Computer Asylum seem to
get a lotta bang for their power supply efforts.
Best, Mats
Follow Ups:
I think I see a balun and the antenna itself is 300 Ω. If the unit at the other end of the cable has both 300 Ω and 75 Ω antenna inputs, it may be worth your while to hunt down some shielded 300 Ω twin lead. Some losses are incurred in the impedance matching balun.
Eli D.
Thanks Eli-
RBRX 1 only has a 75 Ohm input.
My Antennas Direct FM-360 is also 75 Ohm.
I'm afraid dwelling esthetics dictates it's implementation.
BTW, how do you know when you have driven the tuner
"to limit"?
I also noticed that when I amplified the signal the Multipath
increased slightly, whereas the USN reading diminished.
I don't know the significance.
Best, Mats
In a post from 2008 sgmlaw points out the logic of placing
amplification as close to the front end source as possible,
in order to avoid distribution (and other) losses. Connecting
the Sleuth with a short cable near the antenna allowed
attenuation of the amplification with by a not insignificant amount.
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