Serit dying

Discussion about the MiniTiouner board and the MiniTiouner Digital ATV Receive Software. See also http://www.vivadatv.org/index.php
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M5TXJ
Posts: 185
Joined: Wed Jul 05, 2017 8:34 pm

Re: Serit dying

Post by M5TXJ » Mon Sep 09, 2019 11:52 am

Hi Noel,
Of course you can, we're all in this to help each other aren't we. You could also add that to repair the other F socket feed, the dc input pin to the NIM is the one directly below the one used in the photo.
73 Dave.

g8gtz
Posts: 1155
Joined: Wed Apr 07, 2010 6:26 pm

Re: Serit dying

Post by g8gtz » Mon Sep 09, 2019 12:57 pm

Done.

73
Noel

radiogareth
Posts: 314
Joined: Wed Jan 06, 2016 9:46 am

Re: Serit dying

Post by radiogareth » Mon Sep 09, 2019 2:34 pm

WIth my many and various 'connection things' since I built my MT I now have no volts on either pin A or B. My limited knowledge suggests that I can use a nominal 100uH inductor (most come out a lot lower, Chinese QC hard at work!) if I can't find (a) any ferrite beads (b) a 10uH unit.
I've some 1uH 800 ma SMD pellets but I calculate their reactance at 144MHz is only 1K. Be a LOT easier to solder in a through-hole unit.
Gareth

HB9OBD
Posts: 2
Joined: Mon Sep 09, 2019 9:17 am

Re: Serit dying

Post by HB9OBD » Mon Sep 09, 2019 11:05 pm

Thank you Dave,

I've chosen this one:

Digikey code 495-5609-1-ND

73 Luca

dh2va
Posts: 21
Joined: Tue Oct 09, 2018 10:00 am

Re: Serit dying

Post by dh2va » Tue Sep 10, 2019 3:59 pm

The 10 uH choke might be improving 146 MHz performance but I would expect it to be much worse at 2400 MHz. These kind of wired parts have a series resonance frequency much lower than 1 GHz so they appear as low impedance so I guess you have reduced sensitivity at the high end of the Serit's RX range.

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M5TXJ
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Re: Serit dying

Post by M5TXJ » Tue Sep 10, 2019 4:06 pm

Hi ??? DH2VA

In direct comparison with the other input to the NIM there is no difference in performance according to the signal reports given by Minitioune on QO-100, I don't have 2.4GHz gear to try it there.

73 Dave.

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