[Amps] Tips For Winding a Plate Choke

[Artek Manuals]

I believe you will find the US regulation is 200W PEP on 30M , according 
to the ARRL band plan cheat sheet I have, no difference in the context 
of this discussion however

Dave
NR1DX

On 10/10/2019 8:27 AM, Jim wrote:
> 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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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com


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