Re: Zebra Stripes fixed in my 857D
No improvement. I'm going to try one more technique using a soldering iron. meanwhile, the replacement I ordered from Radioworld in the UK is "dispatched" to quote them! This was a very good deal as i stated before due to current exchange rates. I fear these displays will become scarce soon. Sending the display back to Yaesu for repair would likely have cost double what I paid factoring in including shipping each way to Yaesu. The link to the replacement is in my previous post - I'll let all know how that turns out.
73, Howard
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TNX for the ideas so far.
Even in the lowest setting there must be some TX output to be measured by a power meter. That's not the cause. I already went through all menu settings.
Meanwhile I found out there must be some mW output which my power meter does not display. With another RX I can detect a carrier and hear the modulation.
May there be a problem with the ALC? The meter doesn't show any ALC on AM but on FM.?
I think on AM there also should be almost some ALC be displayed. Could anyone please verify this?
73,
Michael
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Re: problem with pkt mode in 9600 baud
I have one variant similar to signalink. Is a Cat/data interface Sm4xiu.?
Yes, is a possiblity that the isolation transformers, can be a source of problems. But now I jumpered it. I have made new tests, and I obtained connections ok, at speed of 7200 bauds in the UZ7HO highspeed sound modem ( with the rig in 9600 mode ). But no at 9600.?
I have good rx, but no TX.
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Caution: the 857 rig have two rx outputs in pkt mode: One pin? for rx in 1200 and other pin rx pin 9600, in data connector. And only one pin for tx in 9600 and 1200. Yes I put a swtich for switching audio 9k6 to 1k2.
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I suspect that the problem is that my usb sound cards (? I? am trying two models ) have a line level output sufficient for 1k2, but? with very low level of signal for 9k6. In fact one of the two have a little more high level than the other.
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I see in the rig with mod indicator at the display, the better sound card, only comes to 1/4 of the modulation scale of the meter.?
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Looking the cat port radio specs. I see the tx input of the rig, have a signal of 1Vpp 10k Zin. I suspect that in general the usb sound cards line level don't have this level of signal. I will measure later, with a oscilloscope the level of signals.
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If this suspect is correct I will contruct a little preamplifer for example with operational amplifer ( non inverter amplifier with single power supply with variable gain).?
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73's? ? ?
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Max power on AM for FT-857D is 25W.?
Mark VK2MOH On 1 May 2020, at 08:46, Hanford Wright <joh69@...> wrote:
? Michael It is menu #75 forgot that sorry Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos.
On Apr 30, 2020, at 18:15, Michael <michael.wohlfarth@...> wrote:
?Dear all,
I recently bought an used 857D that does not tx in AM mode. This is not really a big deal for me as I usually do not need this mode. On the other hand I am curious finding the cause and maybe fix it. While pressing the PTT the trx goes in tx, the relais is clicking and the red light is on, but there is no output power. Any ideas?
73,
Michael DF9TZ
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Michael It is menu #75 forgot that sorry Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos.
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On Apr 30, 2020, at 18:15, Michael <michael.wohlfarth@...> wrote: ?Dear all,
I recently bought an used 857D that does not tx in AM mode. This is not really a big deal for me as I usually do not need this mode. On the other hand I am curious finding the cause and maybe fix it. While pressing the PTT the trx goes in tx, the relais is clicking and the red light is on, but there is no output power. Any ideas?
73,
Michael DF9TZ
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Mike Check your menu go to RF power while in AM and check and see where it is set. ?Should be set to 100. ? Best Regards Hanford R Wright WA4LZC CCA# AC11-12590 y please pardon my typos.
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Show quoted text
On Apr 30, 2020, at 18:15, Michael <michael.wohlfarth@...> wrote: ?Dear all,
I recently bought an used 857D that does not tx in AM mode. This is not really a big deal for me as I usually do not need this mode. On the other hand I am curious finding the cause and maybe fix it. While pressing the PTT the trx goes in tx, the relais is clicking and the red light is on, but there is no output power. Any ideas?
73,
Michael DF9TZ
|
Dear all,
I recently bought an used 857D that does not tx in AM mode. This is not really a big deal for me as I usually do not need this mode. On the other hand I am curious finding the cause and maybe fix it. While pressing the PTT the trx goes in tx, the relais is clicking and the red light is on, but there is no output power. Any ideas?
73,
Michael DF9TZ
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Re: Zebra Stripes fixed in my 857D
CA is Dry, but all 1000 miles of Beaches and their parking areas are Closed! I've experienced?excellent propagation in the past from on top?of the Bluffs overlooking the SoCal beaches. /s/ Richard KI8MYJ
Yeah wet here today as well. Hope it all goes well Howard.?
--
73 Brad N8YG
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Re: Zebra Stripes fixed in my 857D
Yeah wet here today as well. Hope it all goes well Howard.?
--
73 Brad N8YG
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Re: Zebra Stripes fixed in my 857D
Try call Yaesu directly. That is the route I went when both mine had zebra strips and Yaesu was cheaper than the third party places.
Leonard K. Pennock
AD7AS
Those who walk bravely through life, unafraid of loss or failure,
find that they very rarely lose or fail.
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On 4/30/20 11:32 AM, Howard Waxman, WZ4K wrote: Joe - here is a much better alternative:
Whether I'm successful or not re-flowing the display connection, I ordered a replacement...the amazing thing is that, with exchange rates and a discount code, it was $60 cheaper than HRO! $142
Does not include the case, knobs, dials, etc...which you do not need to replace. I think there is a 4-pin connector that will need to be de and re-soldered - other than than it is a drop-in replacement.
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Re: Zebra Stripes fixed in my 857D
:-D
On 30/04/2020 07:33 pm, Howard Waxman,
WZ4K wrote:
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Brad - I did - waiting for the monsoon to subside before I swim
out to the truck!
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Re: Zebra Stripes fixed in my 857D
Brad - I did - waiting for the monsoon to subside before I swim out to the truck!
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Re: Zebra Stripes fixed in my 857D
Joe - here is a much better alternative:
Whether I'm successful or not re-flowing the display connection, I ordered a replacement...the amazing thing is that, with exchange rates and a discount code, it was $60 cheaper than HRO! $142
Does not include the case, knobs, dials, etc...which you do not need to replace. I think there is a 4-pin connector that will need to be de and re-soldered - other than than it is a drop-in replacement.
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Re: Zebra Stripes fixed in my 857D
Thats about where I went.. 645. F which is just a little less. I just saw a little at the edges of the solder..?
Have you tried it Howard??
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73 Brad N8YG
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Re: Zebra Stripes fixed in my 857D
I’m not sure where I found this link. It may have been FB.?
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On Apr 29, 2020, at 5:18 PM, Howard Waxman, WZ4K <wz4k@...> wrote:
? [Edited Message Follows]
<20200429_152939.jpg> OK - video to follow showing the re-flow - nothing to loose here as my display is very bad - if this is a fail I will buy a new assembly before they disappear! Fingers all crossed - safety gear on! 73, Howard
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Re: Zebra Stripes fixed in my 857D
Brad - how hot did you go with the air? I went up to 350C and didn't really get visible flow - trying to be careful not to cook the board!
73, Howard
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Re: Zebra Stripes fixed in my 857D
Also, if that doesn't do it.. you may try the fingers that attach to the LCD and last resort, hit the Display driver IC with a -little-heat..?
Also I read somewhere that that lens? is directional.. FYI, crossing my fingers.!
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73 Brad N8YG
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Re: Zebra Stripes fixed in my 857D
Howard , You can clearly see where to reflow with that picture.. where the flex attaches to the pcb.? ?Yours looks a little like mine did.. so hopefully it's good news.?  -- 73 Brad N8YG
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Re: Zebra Stripes fixed in my 857D
 OK - video to follow showing the re-flow - nothing to loose here as my display is very bad - if this is a fail I will buy a new assembly before they disappear! Fingers all crossed - safety gear on! 73, Howard
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Re: Need help - fuses / power issue
The theory and practice often miss. And most of the theory / rules are more legal issues then technical issues.
The "what if..." legal speculations prevail? instead of real technical reasoning.
Let's assume that the rig is using full power , say 20 A for FULL hour.
Unrealistic , but close to "prolonged" use in my book.
( you supply you own definition of "prolonged use "? )
That is 20 A !
I am not an expert on wire / gauge RECOMMENDED size, but from practical point of view
the connections? in supply and the wire will GET warm due to various real and unwanted ( fuse holder etc. ) resistance.
Now for "fire protection" - give me a realistic example of DIRECT and solid short ANYWHERE along the supply line which will blow a fuse rated to carry 20 A for prolonged period of NORMAL? use and provide "fire protection " same time .
My uneducated? guess would be 25A.
But back to the OP - the real issue was / is - the fuse holder / fuses are? NOT capable of carrying the normal usage current without introducing excessive losses? / resistance into the power supply line.
( Going from roughly? 13 V to close to 10 V is in my book excessive even without using Mr Ohm's law. )?
In other words - the fire hazard is being created and no rules are being broken.
So much for technology and legalese,
.
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Richard Niederberg