Re: File /FT-847 Mods/TCXO_9 mod FT847 ON6AB.pdf uploaded #file-notice

#477

It is not clear in figure 5 where's Q1022, also description says to solder Gnd from the tcxo into pin 1 of Q1022, but also says to solder it to pin 4 of the same Q1022

Can''t do the mod.

Re: Couple of questions

Max Donoghue

#476

I'm using the Kenwood SP-31.? Good idea with the potentiometer. Will give it a try.

Show quoted text

On Sun, Jul 10, 2022, 8:38 AM Spence M0STO via <unavailable.equal=[email protected]> wrote:

External speaker with a potentiometer inline. I’m actually using an Icom speaker (wash ya mouth out) with a custom vero board.

? ?Considerably better sound than the internal speaker.

? De Spence M0STO?

Sent while portable! please excuse typos.

On 10 Jul 2022, at 13:14, Max Donoghue <ve3tmt@...> wrote:

Got everything fixed up yesterday even made a few 6m contacts on the A3S! Now I need to build a 6m beam.

Up first is the volume control mod, not the resistor one. That is annoying not being able to turn the volume down to a comfortable level :(

Re: Couple of questions

#475

开云体育

External speaker with a potentiometer inline. I’m actually using an Icom speaker (wash ya mouth out) with a custom vero board.

? ?Considerably better sound than the internal speaker.

? De Spence M0STO?

Sent while portable! please excuse typos.

Show quoted text

On 10 Jul 2022, at 13:14, Max Donoghue <ve3tmt@...> wrote:

Got everything fixed up yesterday even made a few 6m contacts on the A3S! Now I need to build a 6m beam.

Up first is the volume control mod, not the resistor one. That is annoying not being able to turn the volume down to a comfortable level :(

Re: Couple of questions

Max Donoghue

#474

Got everything fixed up yesterday even made a few 6m contacts on the A3S! Now I need to build a 6m beam.

Up first is the volume control mod, not the resistor one. That is annoying not being able to turn the volume down to a comfortable level :(

Re: Couple of questions

Max Donoghue

#473

Hi Greg,

Simple homebrew keying circuit using an optocoupler. One for the PTT and one for CW. I think I've got the CW side solved (was using a mono plug on the 850, but have to use a stereo plug on the 847). I'll work on the PTT circuit tomorrow.

Max

Re: Couple of questions

#472

开云体育

The TRS Data jack (vs the DIN one) combines the PTT and audio in (for transmitting) on the Tip of that TRS plug.? You need a 2k-ish resistor between the tip and the PTT line, and a DC blocking capacitor (a couple of uf) between the tip and your audio source.? The PTT signal can come from a variety of places.? Assuming you are using a sound card TNC (Direwolf, AGWPE, UZ7HO, et al), most use the serial port "modem lines" (DTR, RTS), with an appropriate buffer circuit.? That can be as simple as a transistor and resistor in an "open collector" circuit configuration.? The PTT is an active-low, so driving the transistor on with the modem line going high will do it, but be sure that the software configuration uses the modem lines in the right manner.? Some are active the wrong way, which kind of makes a mess of things.

Actually I should back up and first ask what you are using for the TNC, and what sort of interface you are using between it and the rig.? Is it just a custom cable between the computer and radio, or are you using something like a RigBlaster?? The circuit above is likely already built into the RigBlaster if that's what you are using.

Greg? KO6TH

Max Donoghue wrote:

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Hi Greg

How do I specially key from the data jack?

Re: Couple of questions

Max Donoghue

#471

Hi Greg

How do I specially key from the data jack?

Re: Couple of questions

#470

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Commanding PTT with the CAT interface takes the audio from the Mike input, not the Data jack.? You have to key the rig from the specific port the audio is coming from, or you'll get silence.

Greg? KO6TH

Max Donoghue wrote:

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Okay, so I am making some progress.

CAT is wired and working, and RX audio from the radio is getting to the computer and being decoded. I am still not getting any TX tones from the computer into the radio through the DATA jack. The radio keys, but this could be CAT doing that. The computer is putting out the tones, because if I direct the audio to my speakers I hear it just fine.

I'm at a loss.

Re: Couple of questions

Max Donoghue

#469

Okay, so I am making some progress.

CAT is wired and working, and RX audio from the radio is getting to the computer and being decoded. I am still not getting any TX tones from the computer into the radio through the DATA jack. The radio keys, but this could be CAT doing that. The computer is putting out the tones, because if I direct the audio to my speakers I hear it just fine.

I'm at a loss.

Re: Couple of questions

Max Donoghue

#468

Thanks Greg,?

I'll take another look at my wiring. I've built homebrew interfaces for years and never had this type of problem.

Max

Re: Couple of questions

#467

开云体育

You must have a short somewhere, likely tip to something else.? PTT occurs when the tip of the plug gets pulled toward ground.? If there's nothing on the other end of the cable, then both the cap and resistor will be (should be) unconnected on one end.?

Greg? KO6TH

Max Donoghue wrote:

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Thanks Andrew

I tried the cap and resistor method as outlined in the manual, put the radio still goes into TX mode as soon as I plug it into the data jack. Even with the audio lines on the other end of the cable unplugged. I'm at a loss.

Max

Re: Couple of questions

Max Donoghue

#466

Nope, just what's outlined in the manual for connecting the audio signals to the data jack.

Re: Couple of questions

#465

Hi Max are using a signalink ? 

And you refer to a capacitor and resistor  is that for the inside of the signalink ?

Did you make up the cable yourself ? One end rj45 the other end stereo 3.5mm plug 

Tex

Re: Couple of questions

Max Donoghue

#464

I may just end up going the front mic jack method. I have a headset already wired and I don't mind swapping for digital modes when needed. Spend most of the time on digital anyway.

Anything special regarding wiring the mic jack?

Max

Re: Couple of questions

Max Donoghue

#463

Thanks Andrew

I tried the cap and resistor method as outlined in the manual, put the radio still goes into TX mode as soon as I plug it into the data jack. Even with the audio lines on the other end of the cable unplugged. I'm at a loss.

Max

Re: Couple of questions

#462

Hi Max,
I found that an extremely easy way to get set up on the digital modes with the 847 while waiting for components to build the proper data/PTT cable was to use a RIGblaster nomic:

They’ve definitely gone up in price ($100 CDN, I think I pay like ~$70 a few years ago). But it works well. The only downsides to it are that you plug it into the mic jack (hence “nomic”) and you need a sound card (either an external USB or an internal one for your computer). My computer had a built-in sound card on the motherboard that I was used with the nomic as my GPU provided audio through HDMI to my monitor/speakers and I found that the set up worked pretty well.

Good luck!

Andrew, VE3YTP

Re: Couple of questions

William Shadid

#461

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Greg,

?

Thank you very much. My FT-847 is in the serial number range of 8K15xxxx so it is well after the 8G05xxxx mentioned in the link you provided.

?

73, Bill, W9MXQ

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Greg D
Sent: Wednesday, July 06, 2022 11:58 PM
To: [email protected]
Subject: Re: [YaesuFT847] Couple of questions

?

The issue was that the earlier version of the radio had a 1-way CAT interface (computer to rig only).? See:?

Greg? KO6TH

William Shadid wrote:

I am still not clear on the serial number when the CPU on the AF-CNTL board was changed. I've tried to search for it but no luck. And for that matter, what was wrong with the initial CPU. (I admit I have not made that search.)

I just picked up an FT-847 and FC-20 that appear brand new. Radio and tuner both did well in recent Field Day.

73, Bill, W9MXQ?

?

Re: Couple of questions

#460

开云体育

The issue was that the earlier version of the radio had a 1-way CAT interface (computer to rig only).? See:?

Greg? KO6TH

William Shadid wrote:

Show quoted text

I am still not clear on the serial number when the CPU on the AF-CNTL board was changed. I've tried to search for it but no luck. And for that matter, what was wrong with the initial CPU. (I admit I have not made that search.)

I just picked up an FT-847 and FC-20 that appear brand new. Radio and tuner both did well in recent Field Day.

73, Bill, W9MXQ?

Third harmonic problem?

#459

Don't know if every radio ever made has the same 'feature' but...

Tried to contact the ISS during field day Uplink 145.990 FM
Downlink came out to around 437.962.3 FM clear receive signal.

As soon as I hit TX the receive signal display goes full scale and all incoming audio is blocked out...and in some cases an audible feedback was heard.

This was replicated with the radio transmitting into a dummy load with no antenna on the receive side and RF power turned all the way down.

it is somewhere around a 20khz range where it feeds back, then drops off to quiet beyond that.

We have two radios of similar age and they both do the same thing on that frequency pair.

Has anyone else ever noticed this?
Is there some setting wrong on our radios?
Is there some filter that needs to be replaced?

Like I said this was during FD, and other locations were able to contact the ISS with apparently no problem...we didn't have this issue on any other satellite- FM or Transponder.

Mike
KF5DEY

Re: Couple of questions

William Shadid

#458

I am still not clear on the serial number when the CPU on the AF-CNTL board was changed. I've tried to search for it but no luck. And for that matter, what was wrong with the initial CPU. (I admit I have not made that search.)

I just picked up an FT-847 and FC-20 that appear brand new. Radio and tuner both did well in recent Field Day.

73, Bill, W9MXQ?