[Amps] Tips For Winding a Plate Choke

[Carl]

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 at gmail.com>
To: <amps at 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 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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