Hi I have high resolution schematics where do you live.
Does VHF tx work?
73
Andrew
Get
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Looking for a good set of schematics with voltage references. My 847 has no output on UHF band, known to me when I purchased it. I'm aware of the issue with the leads on the UHF module losing contact, but I checked that and resoldered just to be sure but did not resolve the problem. Time to start looking elsewhere.? All suggestions on what to check next are welcome. Thank you
Max
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Re: File /FT-847 Mods/TCXO_9 mod FT847 ON6AB.pdf uploaded
#file-notice
Thanks On Sunday, July 10, 2022, 06:21:00 PM AST, Andy Bosworth <sidthepop@...> wrote:
I tried this mod with a chinese TCXO. The HF? stability was better, but on VHF transmit I had a very large buzz with my signal.I tried decoupling, different regulator, everything I could think of. I ended up removing it. You would be better to wrap the crystal in some foam, as it sits in the air stream from fan. Andy
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.
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Any external speaker should sound better than the internal speaker. In the old days radios were designed with large speakers pointing forwards towards the users earholes. Nowadays they fit tiny speakers anywhere they can. Or is that just a ploy to get owners to buy? overpriced extension speakers.
I use a bookshelf speaker, that is around the same size as 847, it was one of two off Ebay at ?25 the pair.?
If I was really worried, I would put a Yaesu sticker on it.
On Sun, 10 Jul 2022 at 14:09, Max Donoghue < ve3tmt@...> wrote: I'm using the Kenwood SP-31.? Good idea with the potentiometer. Will give it a try.
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 :(
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Re: File /FT-847 Mods/TCXO_9 mod FT847 ON6AB.pdf uploaded
#file-notice
I tried this mod with a chinese TCXO. The HF? stability was better, but on VHF transmit I had a very large buzz with my signal.I tried decoupling, different regulator, everything I could think of. I ended up removing it. You would be better to wrap the crystal in some foam, as it sits in the air stream from fan. Andy
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: File /FT-847 Mods/TCXO_9 mod FT847 ON6AB.pdf uploaded
#file-notice
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.
|
I'm using the Kenwood SP-31.? Good idea with the potentiometer. Will give it a try.
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 :(
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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.
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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 :(
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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 :(
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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
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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?
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Hi Greg
How do I specially key from the data jack?
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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.
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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.
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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
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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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Show quoted text
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
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Nope, just what's outlined in the manual for connecting the audio signals to the data jack.
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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
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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
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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
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Andrew Lenton
Andy Bosworth
Spence G5STO