Re: Intermittent Loss of Pre-Driver signal
Hi Steve
All good. Enjoy
73
Neil
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Neil Lintott
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#42772
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Re: Intermittent Loss of Pre-Driver signal
Hi Neil
I now need to focus on some other things here for a week or two.? ?But I am satisfied that the fan modification is keeping things cooler than before.? ?And it's important to note that the
By
Steve G4ALG
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#42771
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Re: Intermittent Loss of Pre-Driver signal
Hi
Now that I have had time to look at the data sheets for the 2 devices.
The physical size would make it difficult to fit onto the space. The replacement is designed to mount on a large heatsink,
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Neil Lintott
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#42770
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Re: Adjusting
I'm interested in this as well.
Bob W4JFA
[email protected]> wrote:
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Bob
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#42769
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Re: Adjusting
Wow!? Pentti -- Your news is both surprising and exciting.? ?I look forward to hearing more news from you.? 73, Steve.
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Steve G4ALG
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#42768
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Re: Adjusting
Hi Steve.
The problem is that the coil is so small and really broken and its wires are partially cut, so you can't see the turns and how they are on top of each other. However, I was happy to find a
By
OH5KOA
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#42767
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Re: Intermittent Loss of Pre-Driver signal
Hi all, Now I'm not sure if this would work. Maybe someone with more
knowledge about FET's can comment.
Attached is the data sheet of the factory FET
Also attached is what I found that may be a
By
Bob
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#42766
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Re: Intermittent Loss of Pre-Driver signal
Hi Neil
I'm very pleased with the initial results having done the parallel resistor part of the fan modification by Richard PA7FA.? ? The fan comes on a lot more now, but will stop reliably once
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Steve G4ALG
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#42765
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Re: Intermittent Loss of Pre-Driver signal
?Hi Steve
Re Fan Mod. Yes I agree, I do have a little noise with it running all the time, mine runs from early morning to mid evening most days( since retirement 8 months ago) and it used to get
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Neil Lintott
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#42764
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Re: Intermittent Loss of Pre-Driver signal
Thank you, Neil ZL3ADC , Dave ZS1DFR, and Bob W4JFA
*Neil:* For now, I will hold off applying a heatsink to Q102 while I consider internal fan modifications.? I didn't feel that I needed to run the
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Steve G4ALG
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#42763
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Re: Intermittent Loss of Pre-Driver signal
Steve, Congrats! I have three questions, was the new FET the exact same
part number?
And, how old is this radio? Was the radio used mobile?
I'm not sure about your wx but here in North Carolina
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Bob
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#42762
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Re: Intermittent Loss of Pre-Driver signal
Congratulations on your tenacity, Steve!
Kind regards,
Dave
zs1dfr@...
"To a father growing old, nothing is dearer than a daughter"
* Euripides 480 - 406 BCE*
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ZS1DFR
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#42761
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Re: Intermittent Loss of Pre-Driver signal
Hi Steve.
Excellent outcome!
I think you need to fashion that heat sinking arrangement to give you some peace of mind for the future.
The fact that fault occurred with pressure on board would
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Neil Lintott
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#42760
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Re: Intermittent Loss of Pre-Driver signal
Thank you, Kurt KD6LZV.? That's very kind of you.
And I have some good news!? ?I've now installed the new FET, and the rig is working again!? ? My SMD efforts looks OK from a distance, but not
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Steve G4ALG
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#42759
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Re: Intermittent Loss of Pre-Driver signal
Steve, et. al,
Thank you for this detailed, clear, and illustrated description of this project.
It takes effort to do this !
I appreciate it.
Kurt
KD6LZV
By
Kurt Sweeny
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#42758
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Re: Intermittent Loss of Pre-Driver signal
*Update: New FET received & old FET removed*
The new FET arrived today, ahead of the de-solder wick.? Upon inspection, I was pleased to see that the FET 'tab' and 'source' connections are made from
By
Steve G4ALG
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#42757
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Edited
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Re: Intermittent Loss of Pre-Driver signal
Hi Neil ZL3ADC , Mark K5LXP, Geoff, Mike ZL1BTB
*Additional Notes*
I've looked for a crack in the case of the FET, but the case appears to be sound.? All the PTHs associated with the FET test OK,
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Steve G4ALG
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#42756
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Re: Intermittent Loss of Pre-Driver signal
Hi Steve
The Freeze spray I had used a straw in noozle so you could direct a small amount onto the board.
Have you been able to indemnify any component as yet?
73
Neil
By
Neil Lintott
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#42755
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Re: Intermittent Loss of Pre-Driver signal
its not a faulty plated thru hole? ?solder a piece of wire through to connect each side ??cheers? Mike zl1btb
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mapinfold
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#42754
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Re: Adjusting
I wish I could help you.? ?I had hoped that someone would have good news for you by now.? ? I assume that L701 is now broken, and that the faulty inductor means that the IC-7000 is now
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Steve G4ALG
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#42753
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