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" <[email protected]>
To: "RSGB LF Gp" <[email protected]>
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 [email protected]
Best Wishes
Alan G3NYK
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