[AMRadio] FT102 and HDVL for 160


Jim Wilhite w5jo at brightok.net
Tue Oct 4 17:48:54 EDT 2005


I contacted them about some equipment I have about 6 months ago.  They have 
nothing except what they currently sell, unfortunately.

73  Jim
W5JO
----- Original Message ----- 
From: "Mike Sawyer" <w3slk at uplink.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, October 04, 2005 3:57 PM
Subject: Re: [AMRadio] FT102 and HDVL for 160


> Geoff,
>    Its a shot in the dark but why not try to contact B&W? They are still 
> in
> business. It may be possible that they may have the data available. I know
> that they do exist since I saw them advertised in old ARRgghL handbooks 
> from
> the 50's. What do you have to lose?
> Mod-U-Lator,
> Mike(y)
> W3SLK
> ----- Original Message ----- 
> From: "W5OMR/Geoff" <w5omr at satx.rr.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Tuesday, October 04, 2005 1:04 PM
> Subject: Re: [AMRadio] FT102 and HDVL for 160
>
>
> VJB wrote:
>
>
>> On the HDVL for 160, yeah Geoff, I wouldn't have
>> thought they existed, either. Is it printed on thejackbar?
>
>
> indeed it is!  On both the HDVL Tank coil (big, wide-spaced 4-pin HDVL
> type) says "160HDVL" on it.  The Grid coil says "160BVL" on it.
>
> I felt like Santa Clause and the Blue M&M during the Holiday Season when
> I saw 'em at a Hamfest;   "They DO exist!"
> ;-)
>
>>Often the stuff they used as a spacer
>>between the turns has failed, chemically. Combination
>>of the heat in an RF tank, and unstable polymers used
>>in plastic of the era.
>>
>>
>
> Got a few of those, but the coils that pretty much are self-supporting
> (40m and up) don't have that problem.  The 75m coils, well.. as
> Otis/K5SWK would say "that's a horse of a different corrall".  I've
> tried using a hot glue gun with limited success, but as one might
> expect, the glue got loose enough to let a turn or two go on the ends,
> but never got pliable enough to drip all over the final... even with the
> heat of a pair of 250TH's in close proximity.
>
>>I'd experiment with alternatives before committing a
>>nicely-wound coil to a given material. Some E-Pox-E
>>(brand name) seems to conduct at RF, or for some
>>reason heats up more than it ought to, which itself
>>can lead to problems.
>>
>>
>
> What's the name of the epoxy that dries as clear as glass?  I imagine if
> it was applied properly, it could be made to look a lot like the bars
> that are use in B&W Coil-stock.
>
>>I've had two brands of HDVL, Johnson and B&W, and
>>neither of their 80 and 40 meter examples did very
>>well 50 years after they were made.
>>
>>
>
> As previously stated, the 40m coil is pretty much self-supporting.  75m
> is a different story, and the 160m coil...  currently resembles a 'limp
> slinky'.
>
>>To repair, I drilled two rectangular pieces of
>>plexiglas to a slightly larger hole than the guage of
>>wire, and then used high-temperature glue at the
>>bottom and top edges, sandwiching the wire turns at
>>the correct spacing and holding them in place. The
>>plexiglas is cut to the length of the coil form (two
>>halves) on either side of the swinging link.
>>
>>Hope helpful.
>>
>>
>
> I'm always appreciative of -any- help ;-)
>
> The spacing on the 160m coil -appears- to be somewhat close to that of a
> 250 ~ 350pf air-variable cap.  I could take one of those apart, use the
> rotor plates to 'comb' the 160m coil into place, then secure the coil
> with a couple of thin peices of wood or teflon with felt to hold the
> coil in place, while the clear-drying epoxy (that looks like air-dux
> rails) sets up and hardens.  I just hope that the spacing is close enough.
>
> The wire was, at one time, enamel coated but most of that is now gone,
> too.  Was thinking of taking the coil, after it's been repaired, and
> then dipping it in liquid rubber (like what they make for hand-tool
> grips) as long as the rubber is non-conductive.
>
> I wonder if plain ol' Testors Model glue would do the job, in place of
> the epoxy?  The coil spacing is kinda tight, on 160m...
>
> just thinking out loud, Paul.
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
>
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