[Amps] Tips For Winding a Plate Choke

[Jim]

We can't run more than 100 watts on 10 MHz in the USA. So no need to 
have it work there.


Thanks
73
Jim W7RY

On 10/9/2019 8:35 PM, Martin Sole wrote:
> 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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>>
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