[HBR] HR-67

[Helmut Usbeck]

>
> v
>
> The HB-67 did not appear in QST. It was first described in the 1967 ARRL
> Handbook, and was designed by W1DX (Byron Goodman). A later version appears
> in the 1969 Handbook, but by 1971 the receivers are all sandstate.

OK! That explains why I can't find it. Don't have those handbooks.
>
> The HB-67 is an 80 meter receiver having a 455 kHz IF, a crystal controlled
> converter for the 40,20,15, and 10 meter bands, and a solid state power
> supply all on one chassis. The coverter is switched out of the circuit on
> 80 meters. Selectivity is fixed at 2.1 kHz by the use of an SSB mechanical
> filter. Audio-derived AGC is provided, and the 80 meter section uses a
> single-ended 7360 mixer.

>From your description it does't sound like my cup of tea.
>
> >  -

>
> There are other beam-deflection tubes that are more common and cheaper than
> the 7360. The 6JH8 and 6ME8 are often-overlooked examples.
>
> The Pullen mixer design is credited with high performance yet is simple and
> sure-fire. The recommended mod for the 75A-4 first mixer is a 6ES8 Pullen
> mixer over the 7360.

That's basically the 6J6 dual triode mixer I mentioned.
>
> >  -No RF stage
>
> This can cause problems with IF feedthrough, images and spurs, but is a
> good idea if you can get adequate RF selectivity ahead of the first mixer.
> I have often thought that a double-tuned input circuit using really BIG
> Miniductor or other high Q coils might be the answer.

A couple of tuned circuits is the answer.  Many people think they HAVE to 
have an RF tube in there.  Not so until one hits 15 Mhz or so.  I have 3 
receivers that don't have an RF stage.  Don't miss it on 40 mtrs.  Choosing 
an IF freq.  is important.  Running only one mixer oscillator makes things 
alot easier to clean up.
>
> >  -Modular construction
>
> A good idea but drastically increases construction time.

Time I've got.  I'm really looking to make this receiver more flexible for 
future mods.  One receiver I have, I built with the front end modular.  I 
have 5 different modules built in 2.5 x 5.0 inch miniboxes.  The "standard" 
6xxx RF with a 6BE6 mixer is really the worst setup I have.  Cheap and it 
somewhat worked, for the manufactorers.  The dual triode is about the best 
(no RF stage).  The 7360 module I have is setup as a real balanced mixer and 
is a bear to keep balanced.  Using this tube single ended which most 
designers do seems to be defeating the purpose of using it. 

Thanks for the input.  CU on the list.

Regards,
Helm.  WB2ADT
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