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Re: [Amps] Tips For Winding a Plate Choke

To: <amps@contesting.com>, "Martin Sole" <hs0zed@gmail.com>
Subject: Re: [Amps] Tips For Winding a Plate Choke
From: "Carl" <km1h@jeremy.qozzy.com>
Date: Thu, 10 Oct 2019 12:17:12 -0400
List-post: <mailto:amps@contesting.com>
Try unwinding a turn and leaving it float and see if the resonance moves up. Try another turn. Reconnect as original if no improvement.

Carl


----- Original Message ----- From: "Martin Sole" <hs0zed@gmail.com>
To: <amps@contesting.com>
Sent: Wednesday, October 09, 2019 9:35 PM
Subject: Re: [Amps] Tips For Winding a Plate Choke


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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