[DSP-10] 1296 RSU Rx Works!

[David Garnier]

Hi Courtney,

Congratulations for pursuing further development work with the DSP-10,
I'm a bit curious about the details on your 1296 transverter and HT. Your
past DSP-10 questions and work have not gone unnoticed. BTW, thanks
for continuing to share your fire in your belly for this project.

I have recently retired at age 60 due to family health & work issues. I am
proud to say I have started to clean all the junk off the floor and on the
benches and resurrect my radio room. A lot of hard choices are being made
here, like pitching an almost complete collection of Ham Radio magazines.
Additionally, I took a lightning strike 2 years ago, still discovering 
fried stuff,
maybe my Booton 92B; really bad. After my cleaning is done, the DSP-10
is next, “kill all the birdies” and finally package the beast.

I worked 29+ years at a major medical electronics company in Midwest
Which manufactures CT, PET/CT and MRI equipment. I was a lab rat for
my first 25 years and ended my career up working as EMC Test Technician
in our A2AL accredited EMC test lab. Having say all that, the pressures of
the business pretty much killed my desire for ham radio activities.
But not any more!

Dave Garnier - wb9own



Courtney Duncan wrote:
> I'm talking to myself on FM!  Frequency is within a KHz, audio sounds  
> good.  Signal level about right for not using an antenna on the HT, ~  
> -83 dBm.
>
> In configuring the DSP-10, it wanted to know "transverter gain,"  
> presumably so the received power readings will be about right.
>
> For the front end the schematic says INA-10386.  The data sheet for  
> that says 26 dB gain typical.  The parts sheet just calls this MMIC  
> "SGA" and the part itself says 35Z.  Google isn't finding much for  
> "SGA 35Z," at least not much that's close enough.  But, I can imagine  
> 26 dB is about what it does.  Does someone know of a cross reference,  
> or what the shipped part actually is/does?
>
> The mixer datasheet says 6.6 dB typical conversion loss.  Let's say 7
>
>  From Figure 3. of the paper, the 1296 hairpin filter insertion loss  
> looks like 7 dB.
>
> So that makes about 26 - 7 - 7 = 12 dB transverter gain, right?   
> (Making the signal level ~ -95 dBm.)
>
> Next:  finish populating the transmitter and see if I can hear myself  
> on the FM HT.  (Whenever I open one type of part I install them all so  
> I don't lose these little pepper flake sized things.  This means  
> installing only A3 and a little hookup stuff at this point.)
>
> Courtney, n5bf/6
>
>
> "It's science. They don't know anything; they just make a lot of  
> educated guesses."  -- Viannah Duncan
>
> Courtney Duncan, n5bf/6
> cbduncan at earthlink dot net
> 144.200, 7.040.
> n5bf at amsat dot org
>
>
>
>
>
>
>
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