Hi Glen,
I use my SM1000 in the speaker/microphone configuration here in the shack.
That being said, I can plug in the external ptt/mic preamp box I use
with my HPSDR transceiver as well. My Shure SM48 microphone sounds a
LOT better that the internal electret insert.
I did find the default transmit audio a little hollow. While I haven't
yet, I did plan to remove the insert from the PCB and mount it directly
to the lid in a small rubber housing.
I'll be following the development of the SM3000 with great interest!
Michael.
VK5LN/VK5ZEA
On 21/07/2020 7:57 am, Glen English wrote:
I need some comments to drive decisions on part choices for the SM30000
My focus is on accessability- being affordable.
Having said that a few dollars saved is poor savings if the new box
cannot meet our forseeable objectives.
The original project leaders are not providing any opinions, maybe
they are burned out. Volunteers get that way.
The original SM1000 had a BOM (bill of materials) of about US$44
(quantity 100) + enclosure and packing. Setup costs for small PCB
runs and small metal work runs are very high compared to the cost of
the job. The Sm1000 used commodity components, nothing special so it
was able to be made in a simple factory.
The SM3000 is not going to be such a simple beast.
My estimate right now is the digital PCB would be approx USD52 or USD60
The analog interface mezzanine PCB (to provide SM1000 functionality)
would be another USD20 (mostly connectors and large passives)
The digital radio mezzanine PCB (HF + 28 MHz IF 1mW radio (capable of
direct aliasing to 200 MHz) 16 bit DAC , low noise clocks, will be
around USD100 if it is high performance.
My questions- Was the Sm1000 a good idea- how many people used them as
intended ?
did anyone use it with the internal speaker-mic, or should that be a
standard headset 3.5mm jack for connection to whatever ?
Total size of the digital PCB is probably around maybe 50mm x 80mm I
guess. If it goes into an existing SM1000 box, the audio board would
become the baseboard, and support all the connectors and the digital
PCB would be the piggyback. IE whole digital radio in the SM1000
existing case (but not much use withotu connectors ) !
-glen
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