[TowerTalk] Phasing transformer answers

[Gene Fuller]

I'm  not sure of the exact relationship, someone in the group probably is, 
but I think  the impedance of the wire/cable used for the windings on the 
torriod is of some significance.  Possibly something like the square root of 
the product of the input and output impedances..??
Gene / W2LU

----- Original Message ----- 
From: "Clint Talmadge W5CPT" <w5cpt at bellsouth.net>
To: "'Glen'" <k4kv at mds-ham.com>
Cc: <towertalk at contesting.com>
Sent: Monday, August 22, 2011 3:34 PM
Subject: Re: [TowerTalk] Phasing transformer answers


>I considered the insulation, but for 30M the most I can run is 200W, so I
> don't think it is going to be a factor.  I am going to get a roll of 14GA
> Romex (which is solid wire)  and use the insulated wires stripped out of 
> the
> outer jacket.  I will play with both a flat wind and a twisted wind and 
> see
> which I can get the neatest.  I will take pictures and post them so I can
> show others what it takes.
>
>
> Clint Talmadge - W5CPT
>
>
> -----Original Message-----
> From: Glen [mailto:k4kv at mds-ham.com]
> Sent: Monday, August 22, 2011 11:07 AM
> To: Clint Talmadge W5CPT
> Subject: RE: [TowerTalk] Phasing transformer answers
>
> It does not matter if you use solid or stranded.  What matters is the
> current and voltage depending on the power you are putting into the
> transformer.  W2FMI Jerry Sevick recommends sleeving #14 wire with Teflon
> tubing before winding the transformer.  That is how I make mine now.
>
> 73's
>
> Glen K4KV
>
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com]On Behalf Of Clint Talmadge W5CPT
> Sent: Monday, August 22, 2011 9:33 AM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Phasing transformer answers
>
>
> Bill - KR8L - came up with the answers, as well as the original 
> calculations
> for the windings.
>
> Bill said:
>
> "Well ... I can't imagine that solid or stranded would make a difference 
> in
> this application, but that's just a guess.  Thinking back to the many
> toroidal inductors and transformers that I have done for kits, it seems 
> like
> they are usually made with solid, enameled wire.  So, I would say that 
> solid
> is a safe way to go for sure, but I would bet that stranded would work 
> also.
>
> Looking through the reference * that I sent earlier, I found these words 
> on
> page 3-4: "The windings on transmission-line transformers consist of
> parallel wires or twisted wires....  Some controversy exists about whether
> the parallel-wire winding is better or worse than the twisted-wire winding
> in terms of impedance and efficiency, but both methods seem to provide
> satisfactory results.  Typically, the twisted-wire windings are configured
> to have between 8 and 10 turns per linear inch.""
>
> * - A chapter on transformers from an old out of print book -
>
>
> Clint Talmadge - W5CPT
>
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Clint Talmadge 
> W5CPT
> Sent: Sunday, August 21, 2011 8:22 AM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Phasing transformer questions.
>
> I am phasing two verticals together for 30M and using the Trifilar wound
> toroidal transformer found in Joe Carr's "Practical Antenna Handbook" to 
> do
> so.  A friend, (more knowledgeable than I,) calculated 19 turns on a 
> T300-2
> core.  I recently found the core and now other questions have arisen.
>
> Does the winding have to be solid wire, or can I use stranded wire, or 
> does
> it matter?  And should the windings be flat wound, such as ribbon cable, 
> or
> twisted together? I have seen both methods.
>
> Any other information which I really need to know would also be 
> appreciated.
>
> Clint - W5CPT
>
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