Hi Al,
Yes, of course. I still have one; the Argonaut 515.
Of course the bands are nowhere near as bad as they were 30 years ago.
I had the original Omni A and at that time, it was better than other radios,
especially the JA radios.
The Drake receivers with Sherwood filters were better.
One thing we would do is tune the preselector lower than its peaked position
to drown out the stations higher up inside our band. This helped.
But it was not as effective as my pot-core preselector.
73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)
73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Paul
Christensen
Sent: Tuesday, September 13, 2016 6:23 PM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Scads of used Icom IC-7300
>"Here in Europe on large antennas at night on the low bands, especially
40m, PIN diodes can partially forward bias and create IMD products. All the
strong arguments you hear from engineers in favor of PIN diodes are coming
from the states, not from the engineers in Europe. A reed relay is a better
option."
I believe the concern relates to the type of switching diode and bias levels
used in a *Receiver's* BPF, not a PIN T/R system. Ulrich Rhode made this a
popular topic in the early 1990s with his QST article titled: "Key
Components of Modern Receiver Design: A Second Look." See his discussion
concerning PIN diode biasing with comparisons to other forms of band
switching diodes.
QST subscribers can read it here:
http://p1k.arrl.org/pubs_archive/90957
Paul, W9AC
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