[Amps] Tips For Winding a Plate Choke

[Martin Sole]

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 at telus.net>
> To: "Roger - W7TZ" <ai7rogerroger at gmail.com>; <amps at 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 at 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 at 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 at 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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