serit tuners ?

Discussion about the MiniTiouner board and the MiniTiouner Digital ATV Receive Software. See also http://www.vivadatv.org/index.php
F6DZP
Posts: 203
Joined: Fri May 27, 2011 9:59 am

Re: serit tuners ?

Post by F6DZP » Mon Mar 25, 2019 8:52 pm

With all my MiniTiouner, I use a 40 pin PCB header, never solder all the NIM pins.

Jean-Pierre F6DZP

YL3AKC
Posts: 16
Joined: Wed Aug 08, 2018 8:42 am

Re: serit tuners ?

Post by YL3AKC » Tue Mar 26, 2019 1:48 pm

BATC sell Serit tuners with vertical mount. Where to get Serit with horizontal mount? I want to rebuild PCB and and want to get horizontal version. Something similar like DATVexpress version.

PS: when I purchased MiniTiouner from BATC, 1st thing what I done, was search for 1.25mm pitch soket for Serit. I like when it is possible to remove Serit from mainboard.

G8GKQ
Site Admin
Posts: 1266
Joined: Sun Mar 22, 2009 1:21 pm

Re: serit tuners ?

Post by G8GKQ » Tue Mar 26, 2019 6:41 pm

Like the vertical mount tuners, I believe that the horizontal mount tuners are only available in batches of 100 from the manufacturer.

Dave, G8GKQ

g8bxh
Posts: 13
Joined: Mon Oct 15, 2018 8:40 pm

Re: serit tuners ?

Post by g8bxh » Mon Apr 08, 2019 1:33 pm

I have a minitiouner batc v2. Strange fault with the lnb dc feed through. Thought I had a faulty lnb as the .3a fuse went on applying 18v for lnb (straight to pin on pcb, no link). After some fault finding it turns out the serit tuner is drawing current (one socket only) in a very unpredictable way. Usually about 4mA on first applying volts but slowly raising till the psu limits (1A). Nothing connected to coax skts and tuner otherwise working fine. This is only on the A skt, B works fine. My guess is one of the internal decoupling caps has gone a bit odd as there dosent seem much else other than the pcb itself in the path. Any one else had this prob?
73s
John

g8bxh
Posts: 13
Joined: Mon Oct 15, 2018 8:40 pm

Re: serit tuners ?

Post by g8bxh » Tue Apr 16, 2019 8:44 pm

Replying to myself,
turns out it was the ceramic decoupling cap on pcb had become a voltage dependant resistor... at least a cheap fix.

m0xtd
Posts: 25
Joined: Sat Dec 12, 2015 7:55 pm

Re: serit tuners ?

Post by m0xtd » Thu May 16, 2019 4:44 pm

Got exactly the same issue. Can you share the details on the fix please?

73s

Ciaran
M0XTD

g8gtz
Posts: 1152
Joined: Wed Apr 07, 2010 6:26 pm

Re: serit tuners ?

Post by g8gtz » Thu May 16, 2019 5:51 pm

I just created an item on the wiki detailing the problem and fix:

https://wiki.batc.org.uk/Serit_tuner#Re ... _DC_output

73's

Noel

m0xtd
Posts: 25
Joined: Sat Dec 12, 2015 7:55 pm

Re: serit tuners ?

Post by m0xtd » Thu May 16, 2019 7:31 pm

Thanks Noel.

That really helpful. Does the value matter?

73s

Ciaran
M0XTD

M5SJM
Posts: 3
Joined: Tue Feb 12, 2019 10:52 am

Re: serit tuners ?

Post by M5SJM » Tue May 21, 2019 2:32 pm

Does anyone have a link to a suitable replacement for this RFC?

Stephen
M5SJM

sean2e0saf
Posts: 77
Joined: Thu Nov 21, 2013 5:29 pm

Re: serit tuners ?

Post by sean2e0saf » Thu Sep 05, 2019 12:45 am

F6DZP wrote:
Wed Mar 06, 2019 6:54 pm
No, it is not a problem if you observe the LNA gain. The best is to have 13dB gain.
This LNA has an AGC so if the signal is too much high, its gain goes down and at the end it acts as an attenuator.
If you see that your LNA gain is less than 3dB or negative (=attenuator), you know that your input signal is too high.

So, Just to observe the LNA gain to know what could be bad on this side.

(Near the LNA gain, I have added an emoticon :( in the version 0.9 to give more advertising about the Input signal when it is too high)

This LNA chip is used by ST Micro in their Professional Demo PCB.

Jean-Pierre F6DZP
jean-pierre

how do i change the lna gain.. i see 0.9db at the moment sad face
23cms AATV from io83qn ( wn68ns )
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parabeam 70cms/18ele

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