[Amps] Tips For Winding a Plate Choke

[Carl]

I should have said remove wire from bottom of choke.

Carl



----- Original Message ----- 
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at contesting.com>
Sent: Thursday, October 10, 2019 4:01 PM
Subject: [Amps] Tips For Winding a Plate Choke


> Date: Thu, 10 Oct 2019 08:35:48 +0700
> From: Martin Sole <hs0zed at gmail.com>
> To: amps at contesting.com
> 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
>
> ##  The  RF  parts /  Ameritron  choke  resonates  at  12.5  mhz.....and 
> 27  mhz.
>
> ##  There  is  no  way  to wind  a   single  choke..with  200+ uh.... 
> that will only
> have one resonance.   They  will  always  have  two  resonance points.
>
> ##  50  uh is  fine  for  80-10m  amps.   On  paper,  100  uh  should 
> work
> on  160-10m.   But  your typ  90   choke  will  resonate just  above  15M.
> A  100  uh  choke will  resonate just  below  15M.  Its  tough  to  park
> resonance points  between  ham  bands.
>
> ##  I  think  its  only  the  usa  that  has a 200 watt  limit on 10 mhz 
> band.
> 750  watts  out....  measured at the  ant...here  in  Canada.
>
> ##  IF  u  removed  turns  from  the  very  top  of  the  rf  parts / 
> ameritron  choke,
> it  would probably shift the  27  mhz  resonance up  higher....like  10m 
> band.  It may or
> may not shift  the lower  resonance  point  upwards.
>
> Jim  VE7RF
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