[Collins] Winter Projects

[K3PID]

Thanks for the info Jerry.  I just picked up an 11th edition handbook with
some good info in it. Actually I plan to model an exciter after the 32V
using the 70E-8A as the starting point.

73
K3PID Ron H.




----- Original Message ----- 
From: "Gerald" <geraldj at ispwest.com>
To: <collins at mailman.qth.net>
Sent: Thursday, July 14, 2005 5:12 PM
Subject: Re: [Collins] Winter Projects


> On Thu, 2005-07-14 at 16:49 -0500, K3PID wrote:
> > Well I'm lining up the work for a long cold winter and I am planning on
a
> > lot of help from the group! First I have my T-368 that  need to do just
a
> > little work on ( new speech amp), second is the rebuild of the Chicago
> > Electronics 20A that I just purchased and it need work, and third is the
> > design and construction of the 160 - 10 meter VFO utilizing the Collins
> > 70E-8A.
> >
> > That ought to take me into spring don't you think?
> >
> > 73
> > K3PID
> > Ron H.
> > .
> >
> That's Central Electronics I believe. Located at Chicago. Had one of
> those once. The 70E-8A is not an appropriate VFO for the CE 20A. The
> 70E-8A is designed for CW and AM from 160 through 10 by multiplication,
> not by heterodyning. The 20A was designed to use a modified 5.3 to 7 MHz
> command set as VFO, retuned to cover 5 to 5.3 MHz. Some bands used
> harmonics of that tuning range. With the coil heat shrunk to the form
> and the capacitor made of zero temperature coefficient Invar, the
> command transmitter stability can be as fine as the Collins PTO. The
> 70E-8A is an appropriate VFO for the T-368.
>
> There are circuits using the 70E-8A in Radio Handbooks from Editors and
> Engineers 11th and 12th editions.
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>