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Re: 857 radio does a reset when transmitting on 80m, works fine on all other freq 40-10
Gary Priest (K8JOK)
What length of coax are you using and are you using any chokes? 73, Gary K8JOK On Sat, Jan 13, 2024 at 17:58, blunde04 <lundebc@...> wrote:
I have not had space until now to do an 80 meter antenna. I put one up and it shows 1.2:1 SWR on 80 meters on my tuner and with my antenna analyzer, resonant on many others (EFHW, ~132 feet long) |
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857 radio does a reset when transmitting on 80m, works fine on all other freq 40-10
I have not had space until now to do an 80 meter antenna. I put one up and it shows 1.2:1 SWR on 80 meters on my tuner and with my antenna analyzer, resonant on many others (EFHW, ~132 feet long)
Radio will transmit on everything else (40, 20, 17,12,10) with good results. Tried both SSb and FT8 and in both cases it will initially go into transmit mode, you can see low SWR on my meter, but then the radio does? a "reset", by this I mean I see the power draw drop to 0 on my astron PS, the radio will shutoff (head loses power) and then will comeback on. Anyone seen anything like this? |
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Re: Homebrew kranker knob for FT 857 / 817?
¿ªÔÆÌåÓýYou could 3D print oneDon Dodge Cell 714-271-7888 W6SNX On Jan 8, 2024, at 6:38 AM, pinoleronica <pinoleronica@...> wrote:
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Re: New Control Heads Available
aa0jb-JimBall
¿ªÔÆÌåÓýNew display is available from Yaesu for around $200.? Easy to change if you can solder and unsolder.? Several videos on YouTube.? Did mine, works like new again? There is a ham in Lees Summit No who was doing them for $250 installed? if you don¡¯t want to tackle it yourself. ? Jimmy AA?JB ? From: [email protected] [mailto:[email protected]] On Behalf Of Bill Akins NT1N ? Hello all |
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Re: Homebrew kranker knob for FT 857 / 817?
FYI, I did find this 817 version from a Canadian seller on ebay. I'm going to order it for my 817.
When it arrives, I'll see if I can figure out if it will work with 857 or with 857 plus some modification, before I install on the 817. Here is another available in the UK |
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Re: Homebrew kranker knob for FT 857 / 817?
Pull the rubber cover off the knob and there is a set screw underneath you loosen to remove the knob.
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Leonard K. Pennock AD7AS Those who walk bravely through life, unafraid of loss or failure, find that they very rarely lose or fail. On 1/3/24 2:28 PM, Patricia KI7IEE wrote:
73s and Happy New Year! |
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Homebrew kranker knob for FT 857 / 817?
73s and Happy New Year! |
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Re: 857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
¿ªÔÆÌåÓýHi Jim, I've owned two FT-857's at the same time, and about 5 other rigs
that I have run mobile at one time or another. When I bought my first FT-857 in about 2002, I also bought a small-ish mag mount and a couple of Hamsticks for 40 and 20 meters.? I set it up in my mobile with the antenna temporarily placed on the roof of the Camry I was driving at the time.? I connected the power temporarily into my cigarette lighter and turned the transmit power down to about 25 watts. The first station I called said he could almost understand me,
but my voice was very distorted, like I had RF on my audio.? Not
yet fully discouraged, I took a couple of large ferrites and
wrapped a few turns of the coax through one, and the mike cord
through another.? I tried again, and although I got decent audio
reports, the rig would randomly shut down when I hit voice peaks
on transmit.? I didn't get the problem to fully go away until I mounted the antenna on a trunk-lip mount (the Comet model that many hams use), and powered the rig directly from the car battery.?? I didn't need any ferrites then, and I could run at a full 100 watts. I later added an Ameritron 500W amp and an extra car battery next
to it in the car's trunk.? I also added a Lil Tarheel HP antenna
(made for 500W power) in place of the hamsticks. ?I scraped a bit
of paint away under the trunk lip mount to make sure I had a DC
ground to the trunk lid, and then added 2 inch wide copper
flashing on each of the trunk hinges to keep the DC ground
potential on the trunk's lid.? This was a killer DX rig at the
time, especially since I had homeowners CC&R restrictions at
my house then.? The FT-857 body was mounted in the trunk and
bonded to the amplifier chassis.? I mounted the radio head in my
dash, and it fit perfectly. Even running 500 watts, I no longer had an RF-related problems from the FT-857.? To be completely honest, I did add ferrites to the cables running up to the radio's head just to make sure I wasn't getting RF inside the passenger compartment, but not because the rig would shut down or had distorted TX audio.? I used this setup for several years until a young woman rear-ended me in stopped traffic on the 85 freeway in San Jose! Now in Utah, I can run whatever antennas I want at home, and drive a Prius, so HF in the car is a no-go due to noise generated by the car's power electrics. I mentioned all of this just to maybe give you some food for thought.? The 857 is super-sensitive to RF anywhere near it, and I've proven this to myself over and over again.? I think your antenna's lack of a proper DC and RF ground is likely to be your culprit.? The fact that it worked for a few months is good news, but things can change due to rust, corrosion, loose hardware, minor change in location, or who-knows-what.? I would seriously consider a new antenna mount that can be bonded to your trailer's outside skin (if it's aluminum like an Airstream) or with a very short, thick, braided wire to the trailer's chassis ground.? Your rig should also be bonded the same way.? If possible, your grounding cable should avoid being 1/4 wave long at any HF frequency you want to use. I rarely hear from people running HF mobile successfully with a
mag mount, regardless of what radio they are using. Another solution which you probably won't like:? Buy a different radio.? I like the Icom IC-7100, and it has never shown any sign of RF sensitivity.? I still have one of my 857's, but I don't trust it to work in places where the 7100 will, like portable ops where the antenna might be nearby. You might also have a look at Allan Applegate's website on running HF mobile.? He's got some great info there:? Good luck, Dave - K7DAA On 1/1/2024 12:48 PM, Jim KM6GUO wrote:
Thank you. Some experiments: |
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Re: 857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
Thank you. Some experiments:
?
The ¡®less often¡¯ - is still often enough that it isn¡¯t useful.My rig is in a travel trailer - currently the antenna is a mag mount vertical on top of a water pressure tank. 'No grounding' per se. But had been 'fine' for the last 3+ months at least in current location. |
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Re: 857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
Gary Priest (K8JOK)
The Digirig also lacks any galvanic isolation of the audio or USB data interfaces. It is a compromise designed to be small and portable. I have had good luck with XGGCOMMS interfaces. They have a bit more isolation built in. 73, Gary K8JOKOn Sun, Dec 31, 2023 at 18:38, vironpayne via groups.io <vironpayne@...> wrote:
The FT-857 radios are notorious for RFI issues. Make sure you have plenty of ferrites and good grounding. You should probably be using premium cables. |
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Re: 857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
¿ªÔÆÌåÓýA quick way to diagnose the problem is to turn your transmit power down temporarily.? I've also seen that FT-857's are much more sensitive to RF around the radio, whether it comes from cables or coming down the coax.? The classic symptom is just what you describe--power cycles off, then on again. It's possible that something very minor changed on your antenna
system to cause this.? It wouldn't even need to be a very
noticeable change.? A likely second cause could be a power supply
issue, but my bet is on RF around the radio, though. Good luck.? Been there, done that! Dave - K7DAA On 12/31/2023 5:38 PM, vironpayne via
groups.io wrote:
The FT-857 radios are notorious for RFI issues. Make sure you have plenty of ferrites and good grounding. You should probably be using premium cables. |
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Re: 857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
The FT-857 radios are notorious for RFI issues. Make sure you have plenty of ferrites and good grounding. You should probably be using premium cables.
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Gaston, the Techprepper on Youtube I believe found some shorter better shielded cables for connecting digirig to an FT-857, if you aren't rolling your own.
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857D with Digirig/WSJTX or Winlink - worked fine - now recycles power on radio on end of transmit
Setup was working fine. Then it started failing. With FT8 on WSJTX or Winlink - at some point (I think on end of transmit) the radio would turn off and on again - sometimes repeatedly...
I tried it on two different computers (and RPi and a Windows machine) that had both been recently working (FT8 on 15M was great to Europe from California earlier this week) "I didn't change a thing" - but perhaps there is some radio setting? or a failure in either the radio or the digirig? Suspecting RFI - I reset all of the antenna connectors - switched battery - reset all digirig connectors. |
Patricia KI7IEE
Jim