Carl,
Did you notice any effect on 10MHz. When I put an Ameritron choke in my
78, which I agree fits just fine, it was okay but went bang on 10Mhz.
Had I the time then I would have investigated moving it to resonate
somewhere else but in stock form mounted in the 78 I measured resonance
at 10.5MHz, too close to 10.1MHz to work I think.
As a more general question, where would be good to place a single choke
for 160-10 9 band coverage, around 12 MHz?
Martin, HS0ZED
On 10/10/2019 08:04, Carl wrote:
Ive had no problems from squeezing the Ameritron choke into Alpha
76/78's etc which is about as tight as you can get.
Carl
----- Original Message ----- From: "Jim Thomson" <jim.thom@telus.net>
To: "Roger - W7TZ" <ai7rogerroger@gmail.com>; <amps@contesting.com>
Sent: Tuesday, October 08, 2019 5:08 PM
Subject: Re: [Amps] Tips For Winding a Plate Choke
## They can be mounted either vertically or horizontally, both
mounting schemes work.
Typ vert mounting is used. Either way B+ has to be fed to
the base of the plate choke.
Also, bypass caps have to be installed at base of plate
choke. Also, you dont want to mount
a plate choke parallel to a sidewall, nor the chassis. The
stray C will screw up the choke,
and shift its series resonances... down in freq.... which
could easily cause catastrophic results.
If you do mount parallel to sidewall or chassis, choke should
be at least 3 x its diameter away
from surrounding metal. Vert mounting solves these issues.
Jim VE7RF
From: Roger - W7TZ
Sent: Monday, October 7, 2019 9:14 AM
To: amps@contesting.com
Cc: Jim Thomson ; MU 4CX250B
Subject: Re: [Amps] Tips For Winding a Plate Choke
Out of curiosity, is there a particular reason that HV chokes are
typically mounted vertically and not horizontally?
73, Roger
W7TZ
CN83ia
Grid Busters
w7tz.webs.com
On Mon, Oct 7, 2019 at 8:57 AM MU 4CX250B <4cx250b@miamioh.edu> wrote:
Oops, I meant 1rps, not 1rpm!
Jim w8zr
Sent from my iPhone
> On Oct 7, 2019, at 9:50 AM, Jim Thomson <jim.thom@telus.net> wrote:
>
>
> ## 1 rpm is too slow....it will take forever to wind.
30-60 rpm works good.
> A slowed down drill press will also work
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