Not all transceivers are bad for broadband noise. The ts-940 was the first
one I knew that was really bad, there have been others since then. my
ft-1000mp's that I run on 6 bands for m/m are good, when all the external
stuff is cleaned up you can be 10-20khz from the exact harmonic and not know
the other band is transmitting.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Kenneth G. Gordon
Sent: Monday, September 25, 2017 18:43
To: rfI@contesting.com
Subject: Re: [RFI] SO2R and 2nd harmonic
Excuse me, but I firmly believe that there is one very important factor
involved here which, at least so far, no one has mentioned.
And that is the horrendous amount of broad-band noise almost all modern
transceivers output. The only modern transceiver I know of in which this
issue has been addressed directly by the designers and dealt with properly
is the Elecraft K-2 and its cousins.
A recent study on this issue by, I believe, a German ham, proved
conclusively that ALL other modern transceivers output a terrible amount of
broadband noise, and any "good"
linear amp will make this problem far worse.
I will attempt to find that study and post a link to it here as soon as I
can.
I believe he showed that this noise output significantly raises the noise
floor, even far from the location of the transmitter itself.
Perhaps this is an important factor in this so-called "RF flooding" issue.
At any rate, I believe it should be investigated.
Ken W7EKB
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|