[Heathkit] Heathkit Digest, Vol 87, Issue 5 - Re-engineering an SB610

[Ross Stenberg]

BLASPHEMY!
All in good humor of course. It is good to be a Ham.

On 4/7/2011 12:41 PM, G3OOU at aol.com wrote:
> Hi Dave
>
> I am in the process of re-engineering an SB-101 at the moment and the
> SB-601 and 620 are in the pipeline to do. The 610 was not a bad design but I
> have never been impressed with the 620 as it was too limited and not very
> stable.
>
> For a good starting point you could look at the X and Y amplifiers and
> timebase from the SB-614.
>
> I plan to do the same as you and convert to solid state which also makes
> more room available and less heat. However, I intend to use a Y bandwidth
> only  up to about 150KHz and put RF directly onto the vertical deflection
> electrodes  for trapezium and AM testing. As my new SB-101 will properly cater
> for FM and AM  as well as the other usual modes I am going to add a simple
> receiver to the 610  to convert from 3.395MHz to 100KHz and include an AM
> detector, FM pulse  counting discriminator and a 100KHz feed to the Y amp so that
> I can look at  incoming signals in more detail and measure their deviation
> on FM as well as my  own outgoing signal on all modes. I have arranged for
> an interface on the SB-101  to feed Rx and Tx audio, Rx and Tx IF and the PTT
> line to the revised 610.
>
> I would be interested in swapping notes in due course.
>
> 73
>
> Bob
>
> Bob F Burns
> C Eng,  FIET, MSE
> Amateur Radio Callsign: G3OOU
> Registered RSGB  Instructor
> G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:  TQ25
> Secretary of Crystal Palace Radio&  Electronics Club: _www.g3oou.co.uk_
> (http://www.g3oou.co.uk/)
> Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou)
>