[ARC5] Question on IF transformers...

[Dennis Monticelli]

Ken,

I share your appreciation for the original design and those that created it.

If you only have one type of transformer then just use it.  It's not going
to hurt anything.

Dennis AE6C
On Sat, Oct 18, 2014 at 2:00 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 18 Oct 2014 at 11:16, Dennis Monticelli wrote:
>
> > Ken,
> >
> > Hard to tell without getting into the designer's head.
>
> Yes. I had thought the same...
>
> > The tap is a "free variable" for the designer.  It costs nothing to take
> > advantage of it...or not.  The designer can use it to achieve max power
> > transfer if his IF gain is on the low side or he can throw away gain if
> he wants
> > to promote IF strip stability in the face of component/tube variations
> or if he
> > wants to achieve unloaded Q for max selectivity.  Exact positioning of
> the taps
> > is often one of the last choices made in the overall design optimization
> and it
> > was probably not a critical decision with some of the stages in some of
> the
> > receivers.  In other words, we may be overthinking this a bit.
>
> I suspect you're correct, Dennis.
>
> The reason I asked is that in my pile of parts, I have quite a number of IF
> transformers for 239 Kc, but all are IF transformer #3, and I have only one
> "complete set".
>
> I have at least 3 and possibly 4 semi-restorable BC band ARC-5s, but only
> the one set of all three of the correct transformers.
>
> I have another two chassis which will require quite a bit of JB Weld to
> plug all
> the "idiot holes", but may also be "restorable" to working condition.
>
> What I am looking forward to is to try to set up a working ARR2 type of
> "find
> your way back to the carrier" setup as someone else did.
>
> I think that entire system was very unique and a real technological
> wonder, a
> master-piece of design and original thinking.
>
> Ken W7EKB
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>