[HBR] Link to pix of HBR16 and HB SSB transmitter LINK

[john]

Thanks Walt,

First I need to find someplace capable (Kinkos?) of scanning/copying a 
18x24" document. Fortunately the schematic was tucked into the rig and is 
in quite good shape...all done with one of those little plastic stencils 
and a drafting pencil.

Fun station! I look forward to putting it on the air after a 
checkout.  Will look forward to your comments on the schematic.

John K5MO



At 03:48 PM 6/23/2006, waltah at ntelos.net wrote:
>John wrote:
> > I've upped some pictures of the "New" HBR16 and Homebrew SSB transmitter
> > I've recently acquired. I wonder if anyone recognizes the
> > transmitter?  I've uploaded some pictures as requested by several.\
> >
> > http://www.k5mo.com/Temporary/HBGear.htm
>
>How COOL!
>
>The 75-20M combination was most often done by 'band imaging'
>with a 9 Mcs IF.   I see the 455 kcs IFT in one of your pictures so
>this could be one that generates the SSB at that frequency,
>hetrodynes it up to 9 mcs (filtering could be done at either
>frequency but most likely at 455) and then mixes with a 5-5.350
>Mcs VFO.   That suggests an earlier -- say 1960 +/- -- design.
>Tidier ideas -- fewer conversions -- were more common later.
>
>Upconverting from 455 kcs to those two bands to 75-20 will
>generate some spurs.   8 x 455 = 3640, 9 x 455 = 4095.   And
>others, too, depending on details of the conversion scheme.
>
>I can't think of a way to make that conversion work without having
>to generate both sidebands.   The nicer band imaging designs give
>you LSB on 75 and USB on 20 without having to do that.   For
>example, generate USB at ~5 Mcs and either add that to or
>subtract it from a ~9 Mcs VFO.   Stability is a challenge with that
>one, but it can be done, and it's trivial for VXO-type designs.
>
>(Anyone here ever build the 'Imp'?   Three tube VXO SSB
>transmitter found in one or two of the SSB For the Radio Amateur
>books?   Someday I'm going to do that with 150 mA tubes, say
>with a 70L7 rectifier/PA or a pair of 35GL6's, and two 17H3's or
>35W4's in a doubler.
>
>(Definitely regressing in my old age.   I use fewer and fewer solid
>state diodes, more and more glass ...)
>
>I'm just nitpicking about the TX design.   This was done at a time
>when ham SSB gear didn't come in a four-color box with a plastic
>handle on the top from Japan and it represents some serious ham
>skills.   Congratulations!
>
>One you get the circuit diagram up we should be able to figure it
>out.
>
>Walt
>KJ4KV
>
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>
>
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