Roller inductors usually start arcing in ham use where they are usually
fixed tuned for long periods in other service.
The flat bar stock rollers with contacts on 2 sides are better than wire and
round ones.
Carl
KM1H
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "MU 4CX250B" <4cx250b@miamioh.edu>; "Al Kozakiewicz"
<akozak@hourglass.com>
Cc: <amps@contesting.com>
Sent: Sunday, January 19, 2014 11:46 AM
Subject: Re: [Amps] Building an Amp 101
Instead of all those relays why not a roller inductor and motor.
But still complicated
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of MU 4CX250B
[4cx250b@miamioh.edu]
Sent: Sunday, January 19, 2014 9:32 AM
To: Al Kozakiewicz
Cc: amps@contesting.com
Subject: Re: [Amps] Building an Amp 101
Relays are certainly a possibility, Al, but for a nine band amplifier
things get a bit complicated. My latest project ( 90% completed) is a
duo – band 80m/160m amplifier with a pi– L tank circuit, and for that
I am using two DPDT vacuum relays, each of which cost over $100.
Scaling that up to a nine band amplifier doesn't seem very practical
or cost-effective.
73,
Jim w8zr
Sent from my iPhone
On Jan 18, 2014, at 8:52 AM, Al Kozakiewicz <akozak@hourglass.com> wrote:
Why not use relays appropriate for the switching duty? Then the
bandswitch can be just about anything or even remotely controlled. Plus
you can locate the switch where it's convenient to operate instead of
being constrained by the necessity to place it close to the RF components.
Al
AB2ZY
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