You dont want any coils mounted that way. If size is a concern use powdered
iron toroids of sufficient size, with HV tape insulation and Teflon
insulated wire. If its good enough for Alpha its good enough for you.
Carl
KM1H
----- Original Message -----
From: "David J Windisch" <davidjw@cinci.rr.com>
To: <amps@contesting.com>
Sent: Thursday, December 31, 2009 10:56 AM
Subject: [Amps] B&W 852 tank inductor question
> Happy New Year, everybody.
>
> I have one of these B&W 852 tank inductors, 3-1000Z, 250pF tuning
> capacitor, 2nF air loading cap, and everything else needed for 80-10M,
> *stuffed* into a nice enclosure.
>
> Now I'd like to include 160M, as well as fix the
> not-quite-enough-inductance problem on 80M described in the AMPS archives.
>
> It appears that, on 80M, another 1-2uH needs to be added to the 852.
>
> Another 8uH on top of that for 160M, for a total tank L of about 16-17uH,
> will take care of 160M.
>
> I can fit an extra contact onto the 852 to switch in the added inductance
> (with 80M tap) for 160M, and fit another switch section onto the 852
> shaft, to take care of padding capacitors for tuning and loading on 160M.
>
> In order to stay within physical bounds, and before I start tearing things
> up, could the added inductor be concentric with, and inside, the 80M turns
> on the 852 (I have some big Airdux wound with #10 wire which fits), or
> would it be better wound outside, which would still fit within the
> enclosure?
>
> Tia & brgds,
> Dave Windisch, W8FGX
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|