FT817ND Front Panel PCB replacement - Blinking display
I have just replaced the front panel PCB on a friends FT817ND (Lot82).
I had called Yaesu UK and the told me that the board was compatible (CS1909409).
It was a straightforward replacement except for
By
David
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#115615
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Re: FT-817 almost powers up
Update - With the main PCB completely removed from the radio chassis and a jumper installed across Q1082, I was able to see good 9v, 6v, and 5v lines. ?From there, I installed the front panel unit
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Ben Mook
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#115614
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Re: WHATSON 3A Power Supply
Providing the Watson 13V at 3A, and 5A peak, power supply is a linear one with a black case and two screw trerminals on the front panel, then it SHOULD be the same as I have to run my FT-817 or other
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Peter LB0K
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#115613
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Re: FT-817 almost powers up
I know this is kinda a long shot here, but Bill W1PA, were you able to solve the problem with your radio?? I have one here with the exact same problem as yours.
Plugging in the power results in a
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Ben Mook
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#115612
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Re: FT-817 +DSP +new finals FOR SALE
Pictures, please. Very interested.
--
Robin Kidd
W4IEN
w4ien@...
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Robin Kidd
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#115611
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FT-817 +DSP +new finals FOR SALE
Nice clean FT-817 (non D) FOR SALE
Includes:
* Ft-817. (Non D)
* New Final Amplifier board with new factory installed final transistors
* bhi NEDSP106 DSP super clean noise reduction
* Narrow CW
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John, WA6YSY
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#115610
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Edited
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Re: FT 817 repaired
I only adjust the finals. Will check driver bias also.
As metioned before: it is FT817 frame with complete new FT818 interioer.
There might be a lot to adjust also...
cheers Ray
Am 21.11.2024 um 02:46
By
Raimund Reh
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#115609
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Re: FT 817 repaired
John, are you adjusting bias for driver and finals, or just the finals? If it's just the finals, you'd normally set the second pot for twice the current, or 84mA.? I realize it's a small difference,
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Dave Mueller AA3EE
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#115608
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Re: FT 817 repaired
hi Ken
after replacing every board in my old FT-817 by brand new ft-818 boards (see in this group)
I could set current to the FINAL UNIT as mentioned.
BUT no power out at all. Carrier is ok...
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Raimund Reh
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#115607
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Re: Power output instable
Gavin, thanks for posting this on your experience with the battery pack
issue and destruction of the finals, I have never used a battery pack in my
2001 ft817 and it still has the original finals
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VE1RNM
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#115606
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Re: MRW-HF100 antenna set
Per the OP (!) the MRW-HF100s are base loaded whips not dissimilar to the majority of garden variety CB radio whip (and I have to slot Elecraft's spendy examples in the same category.) In resonating
By
Steve
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#115605
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Re: Power output instable
A lot thanks, Al.
It solved for me: I switched a dozen of times between 6m (rear antenna) and 2m (front antenna) and it solved. I hope forever, but I'm not confident; however I know what I have to
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Pietro Molina
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#115604
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Re: MRW-HF100 antenna set
Yes, though if you are in a very wet location one earth spike might do.
Only radials that are in air, above the ground, can be resonant.
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Mike EI9FEB
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#115603
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Re: MRW-HF100 antenna set
Assuming mast or skyscraper grade lightning conductor. Most of us don't have that, so one or several earths is moot.
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Mike EI9FEB
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#115602
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Re: MRW-HF100 antenna set
Antenna ground or counterpoise isn't the same than house ground/earth neither serves the same purpose.
A counterpoise (grounded or not) is used to avoid returning RF towards the rig via balancing
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Luis Miguel Casta?eda
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#115601
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Re: MRW-HF100 antenna set
I have to jump in here...The US is single phase power to the house.? The transformer that makes the transition from high voltage to 220 volts is only connected to one phase if three phase power is
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Al WB9UVJ
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#115600
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Re: MRW-HF100 antenna set
I was chief engineer at a TV station in USA.
Everything was bonded to a single point ground.
Inside the building we used 6" flat copper strap.
We took many strikes to the 2000' tower, but never had an
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Glenn Little
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#115599
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Re: MRW-HF100 antenna set
Here's what I have come to know about lightning. The trick with
lightning is less about ground and more about making sure that the
lightning's energy is routed past (not through) you and
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Greg D
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#115598
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Re: MRW-HF100 antenna set
A single "ground" makes little or no difference. You need all aerials and power cables, Cable TV, phone cables disconnected. A strike even 100m from the utility cables (even buried electricity, phone,
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Mike EI9FEB
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#115597
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Re: MRW-HF100 antenna set
Glenn,
Quite simple, disconnect your radio and other equipment completely during thunderstorms.
I learned my lesson many years ago when I got hit by lightning which took out my TS-430s, computer,
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Dave Burroughs
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#115596
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