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From: | |
Reply To: | Mike Duke, K5XU |
Date: | Sun, 28 Mar 2010 21:16:08 -0500 |
Content-Type: | text/plain |
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The big thing that having the tuner set to work in receiver mode does
is to serve as an additional noise filter. It does so by narrowing the
amount of spectrum which includes both signal and noise that hit the
front end of your receiver or transceiver.
If you really want to hear what I'm talking about, connect a manual
tuner and ten or fifteen feet of antenna wire to one of the hand held
DC to Daylight receivers such as those in the THF6, Icom T90, and
other vhf hand held rigs. You adjust it by tuning for maximum received
signal as indicated by the audio signal processor that is between your
ears. You will be surprised with the result.
My THF6 is pretty worthless on shortwave without such a tuner
arrangement.
So, if you are using the internal tuner of your hf rig, set that tuner
to work on receive too. Then, if you want to tune way out of the
normal band width of your antenna, simply turn the tuner off until you
are ready to transmit or listen within the ham bands again. The
difference won't be as dramatic as for the hand held units which have
no front end filtering at all, but you will still notice some
improvement in signal Vs noise.
Most external manual tuners live in the receive mode at all times.
Some, probably all, of the external automatic tuners can be set to not
work in receive mode if you find that you don't really notice a
difference.
----- Original Message -----
From: "Howard Kaufman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, March 28, 2010 6:25 PM
Subject: ts480 test
I don't trust my observation, so I'd like somebody else to test it.
After a
day of experimentation, I think that using my ts480 with an external
tuner,
provides a better signal to noise ratio after tuning the antenna, than
does
bypassing the external tuner and using the internal tuner. I don't
use the
internal tuner on receive.
I'd like an observation and an explanation. Seems surprising to me.
H T Kaufman MSW LCSW
Adaptive Technology Instructor
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