Looks about the same as what I have...
https://www.amazon.ca/Seesii-Analyzer-10KHz-1-5GHz-Measuring-Parameters/dp/B08132DJLS/ref=asc_df_B08132DJLS/?tag=googleshopc0c-20&linkCode=df0&hvadid=335212258477&hvpos=&hvnetw=g&hvrand=729350672648384458&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1002310&hvtargid=pla-869965344213&psc=1
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Ah in that case, buy one of the those small software defined Spectrum analysers, and a few SMA adapters so you can put a scoop probe on it! Look at the single input on the VHF side the UHF will or should be a similar level! ? 73 ? ?
? ? Andrew ?
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I don't have a lot of test gear. Multimeter, small portable scope from Amazon and a NanoVNA.
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Thank you Andrew, will do.
RX on the UHF band is fine. It's just the TX that has failed.?
Max
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Ah That Kingston, not the one 12 miles from me here in Hampshire ! ? This should help, check the drive and the VCO locking they do drift out of lock ? 73 ? Andrew ? ? ?
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Hi Andy,
I touched up the both the PCB and the module solder connections. I may just go in and start inspecting solder contacts to make sure everything is good. Voltages would help but I do have the hi-res schematics to get me started.
Max
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Howdo. When you say you resoldered the leads, was that the leads on to PCB, or taking the top off the module and resoldering internally?
I had a problem with a VHF PA that turned out to be a bad solder connection on an inductor. DC one side of inductor leg one side of PCB, but not the other. It was a bad connection to copper.?
On Tue, 12 Jul 2022 at 12:59, Max Donoghue < ve3tmt@...> wrote: Hi Andrew,
VHF is fine. I'm in Kingston, Ontario.
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Hi Andrew,
VHF is fine. I'm in Kingston, Ontario.
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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.
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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.
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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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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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Andrew Lenton
Andy Bosworth
Spence G5STO