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Message-ID: <015e01cc7400$1d8e5170$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <004401cc7392$0afa5860$4001a8c0@lark> <1B4EF9026CBA4099ABA3DDC07BC87FFE@tc402d33c25094>
Date: Fri, 16 Sep 2011 00:35:10 +0100
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Subject: LF: Re: Re: Litz wire available
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Hi Julian glad to see you are still lurking :-))

I think the PO/BT technique was a solder pot ...but we are not running 1MW
:-)) In passing I did manage to liberate one of the SRBF formered toroids
used on the power sensors, the hole for the Litz was about 2 inches
diameter.....I also managed a photo of one in situ in the feed to the
variometer in the "loft". Some "SWR meter" !!

Alan



----- Original Message ----- 
From: "Julian Hardstone" <julian@rosestone.me.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, September 16, 2011 12:10 AM
Subject: LF: Re: Litz wire available


> Alan - I see from your own page "A History of Rugby Radio" that the Litz
wire used in the 16kHz
> loading coils was 6561 strand (81^3), and I recall hearing the erstwhile
Chief Engineer (who's name
> I forget) giving a talk on the station and speaking of the difficulty of
terminating this Litz: a
> dry joint on any strand would result in fire. ISTR That the only available
test for the 13122 joints
> was visual inspection. Take care with that Litz!
>
> For succesful soldering to Polyurethane-insulated wire I recommend using
an iron at about 400°C with
> plenty of flux and in good ventilation
>
> For an uncompleted rx loop aerial project I once made some Litz. I had a
large quantity of 0.5mm
> enamelled copper so I laid strands down the garden and twisted them with a
cordless drill, ending up
> with 3 × 3 strands. The procedure is straightforward if you can find
somewhere long enough, and
> private to work undisturbed, but no need if you can buy Litz
>
>  - Julian G3TFR
>
> ----- Original Message ----- 
> From: "Alan Melia" <alan.melia@btinternet.com>
> To: "RSGB LF Gp" <rsgb_lf_group@blacksheep.org>
> Sent: Thursday, September 15, 2011 11:27 AM
> Subject: LF: Litz wire available
>
>
> > Hi all, I attended a microwave event at the Crawley Club at the weekend
and
> > met Derek Atter again, G3GRO, who was an early pioneer of LF in the UK.
> > Despite now being wheelchair bound Derek still takes and active interest
in
> > all things radio.
> >
> > He advises me that the Crawley Club still has a substantial amount of
Litz
> > wire available. This is quite thick ....Derek says about 800 strand
which I
> > think will mean 729 strand as proper Litz is always a power-of-three.
There
> > are two types avaiable, PTFE jacketed  and DCC (double cotton covered
for
> > the youngsters :-))  )  I recollect this is about 3 to 4 mm outer
diameter
> > and was used on the PA and antenna tuning coils at the Decca Navigator
> > sites. I understand this is available in return for a donation to Club
> > funds, and a carriage charge. So now is your chance to increase the "Q"
of
> > your loading coils!!
> >
> > Please correspond directly with Derek on derek.atter@gmail.com
> >
> > Best Wishes
> > Alan G3NYK
> >
> >
>
>