Mars for Serial 1C470057
Does anyone have one of those rigs? I cant get it to works on 60m and 27Mhz. Have tried the options found searching and nothing. It was purchased in Japan.
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HI8RMQ
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#591
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Re: new, hello
I have tried 111010, nothing.
I have a japanese model, I'd like to use 11m band. Gives me error. Any help?
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HI8RMQ
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#590
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Re: If low at O/P then trace back D2016 switching?
That does not make sense, unless the UHF is banded 410 to 439 and 440 to 470
Sent: 23 July 2022 14:55
To: Andrew Lenton
Cc: [email protected]
Subject: Re: [YaesuFT847] If low at O/P then trace
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Andrew Lenton
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#589
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Re: If low at O/P then trace back D2016 switching?
GO on pin 3 or the collector of Q2014, there should be a healthy signal there on RX as it is working! And on TX the seam level but a different frequency
73
Andrew
Sent: 24 July 2022
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Andrew Lenton
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#588
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Re: If low at O/P then trace back D2016 switching?
Dear Max,
Take a look below:
The UHF path to the LO output is slightly different to VHF so from D2018 it is the same, Q2022 is unique for UHF
Bottom line:
there is switched power on
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Andrew Lenton
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#587
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Re: If low at O/P then trace back D2016 switching?
I do not believe in two faults, the VCO assuming it is a VCO, might me fixed frequency and the if moves to change frequency.
Check 8 V on both VCO, tx rx, the check the o/p, tx and rx share a path,
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Andrew Lenton
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#586
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Re: If low at O/P then trace back D2016 switching?
Am I making the correct measurements?
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Max Donoghue <ve3tmt@...>
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#585
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Re: If low at O/P then trace back D2016 switching?
Seems odd the voltages are good on the VF0 control voltage pin!
There is not much to go wrong on a VCO I will see if I can find one!
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Andrew Lenton
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#584
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Re: If low at O/P then trace back D2016 switching?
I'll button it up for now so I can get back to using it and look for a PLL board to replace. Would probably be the easiest remedy.
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Max Donoghue <ve3tmt@...>
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#583
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Edited
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Re: If low at O/P then trace back D2016 switching?
Sorry did not spot the attachments check directly on the the UHF TX VCO
Does UHF RX work, judging by your measurements, I would say no.
VHF frequency of 190 Mhz was unsepected, so the LO is high
Looks
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Andrew Lenton
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#582
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Re: If low at O/P then trace back D2016 switching?
No content
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By
Andrew Lenton
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#581
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Re: If low at O/P then trace back D2016 switching?
On Sat, Jul 23, 2022 at 6:03 AM Andrew Lenton <a@...> wrote:
Hi the SAT button on and off a few times!
>
* Hitting the SAT button lights up all the buttons for sat operation. Do
hear
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Max Donoghue <ve3tmt@...>
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#580
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Re: If low at O/P then trace back D2016 switching?
Hi the SAT button on and off a few times!
Check Q2017 is switching as this will kill off the UHF RX and TX LO this should be working as RX is working can you confirm this, tx on a hand held or
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Andrew Lenton
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#579
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Re: UHF TX issue
Indeed we are, I will track the fault down over the weekend by studying the circuits
73
Andrew
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Andrew Lenton
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#578
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Re: For Sale
Here are a couple of pictures for you all.
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Russ N4MAV <n4mav1@...>
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#577
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Re: UHF TX issue
For those who were following this thread...
I received my Tiny SA signal analyzer yesterday and started checking signals.
https://www.tinysa.org/wiki/
The TX local oscillator signal is present on
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Max Donoghue <ve3tmt@...>
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#576
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UHF TX issue
Hi Max,
OK you need to check J3006 TX I.F., and J3007 TX LO, they are common to VHF
and UHF, The LO is the bit that changes frequency, check it does and the
level is the same on VHF and UHF, if
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Andrew Lenton
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#575
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Re: Schematics?
J3008 - TX IF ~ 600mV
Checked D3035 and D3036? both 0.762V one way, nothing the other
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Max Donoghue <ve3tmt@...>
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#574
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Re: Schematics?
Voltage readings:
J3015 pin 7 (UT8)? 7.83V
J3016 pin 3 (UT8)?? 7.83V
J3011 pin 1 (UHF T8)?? 7.83V
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Max Donoghue <ve3tmt@...>
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#573
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For Sale
Hi Everyone,
I received the below in my email today.? I hope somene can help the gentilman. :)? I'll give the group first dibs on this, then it'll be going up for grabs on QRZ.com.? Do NOT
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Russ N4MAV <n4mav1@...>
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#572
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