A few remaning questions

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Diskussions- und Newsboard des DARC-Ortsverbandes I40 | allgemeine Kategorie | OVI40 SDR Projekt (English AND German discussions around OVI40 SDR project) (Moderators: DF8OE, DL1PQ) | Topic: A few remaning questions

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sm0nor
schon länger dabei

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Ich liebe dieses Forum!

A few remaning questions
« on: 28. February 2018, 20:20:47 »

Hi All!
I'm very close to hitting the goal but I have a few details I'm wondering about:
1, There is a D4 marked on the board but nowhere else. What is the purpose of this diode?
2, There is no C110 in the BOM. Correct?
3, T3 was missing in the bags so I'm skipping this for the time being. Under what condition do I need the optional mic bias?
/Ulf

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peter_77
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THE mcHF and UHSDR forum !

Re:A few remaning questions
« Reply #1 on: 01. March 2018, 07:49:46 »

Regarding issue 1. take a look at the schematics.
https://www.amateurfunk-sulingen.de/data/uploads/ovi40-sdr/uhsdr_ovi40_ui_v17_sheet.pdf
Right hand side where the mini USB connector is.
D4 is optional and it provides 5V to the mini USB plug.
Usually its not needed and can also cause problems cause the mini USB is a USB client where 5V is provided from the host (PC). This may conflict with the 5V from the connecting host.
Micbias in issue 3. you need in case you connect an electret condensor microphone. They will not work without a bias voltage of course.
Most of the cheap China Baofeng or Kenwood style microphones often used here are electret condensor mikes today.
See infos from DL1CR regarding this here https://www.amateurfunk-sulingen.de/forum/index.php?board=15;action=display;threadid=330;start=15

« Last Edit: 01. March 2018, 07:59:04 by peter_77 »

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