Re: TR4310 HF Transceiver
On 2025-02-05 14:18, Gary WB6OGD via groups.io wrote: Yesss..
Jerry,
I talked to you abut a Teensy speech processor after hearing about
your excellent work on your KWM-2 CW mod.
I just ordered a Teensy 4.0! *** Excellent. Use the graphic audio design tool at PJRC.com. For the KWM-2 project, I didn't use any sort of audio card. I used an ADC ( analog input ) pin for input, and a sort of PWM output they support called "MQS". MQS sounds amazingly good. - Jerry
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Re: TR4310 HF Transceiver
I would very much like a software phasing ssb generator.
On Wed, Feb 5, 2025 at 5:18?PM Gary WB6OGD via <winbladgary= [email protected]> wrote: Yesss..
?
Jerry,
I talked to you abut a Teensy speech processor after hearing about your excellent work on your KWM-2 CW mod.
I just ordered a Teensy 4.0!
?
This should be a fun new project after years of Arduino fun,? though I will be starting out from the bottom..? hi hi.
73,
Gary
WB6OGD
?
-- Frank Barnes
Chapel Hill, NC
Grid Square FM05
Cell 919.260.7955
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Re: TR4310 HF Transceiver
Yesss..
?
Jerry,
I talked to you abut a Teensy speech processor after hearing about your excellent work on your KWM-2 CW mod.
I just ordered a Teensy 4.0!
?
This should be a fun new project after years of Arduino fun,? though I will be starting out from the bottom..? hi hi.
73,
Gary
WB6OGD
?
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Re: Warning on the 7077 (and any plastic Astatic mic)
For clarification, I believe that the head was glued to the base at the factory and the screw held it in place.?
If any of you have a 7077 that¡¯s partially disassembled, please let me know if this is what you see.?
I still don¡¯t know why anyone would have installed a low-Z element unless the original high-Z one had died and the low-Z element was what they had available. There could have been some ¡°mod¡± passed around to improve the performance. I know that this mic, stock, isn¡¯t held in high regard¡
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Wed, Feb 5, 2025 at 14:36, Steve Wedge, W1ES/4 via groups.io < w1es@...> wrote:
As I grind my way through figuring what is wrong with this mic and how to repair it, I came upon an "O Cr@p!" moment when trying to disassemble it.
You see, the wiring that came up through the vertical bit to the head had fallen down and was flopping around loose, with the base.? Looking at? the inside of the head, I saw a phillips screw and throught, "Great!, I will remove the head from the stand and then I can feed the wiring up through the stand, then through the head."? and so on.
Dueing manufacture, the head is assembled to the base and held in place by that screw.? AND with glue!? The result is, if you're expecting the head to come off the base after removing the screw, it will but not in the way that you'd expect.? It broke.
Upon looking at the break, I could see evidence of glue that was the undoing of this mic.? Seeing that there was glue, I wondered if i could just do some "airplane glue" type joinery (IOW, was the glue similar to PVC pipe cement?).? It appears that I was correct and the head is back on the base but I'm going to be careful with it now.
If you lose the wiring through the base, the best way to get it back will be to fish some string down through the head and base and pull it back up that way.
It's a minor thing but may be useful to someone in the future.
I'm still troubleshooting the mic itself.? From what I'm seeing, the element in my mic is low-Z (hence the 400 ohm resistance across its terminals0..? Looking on my scope at 20 mV/div, I get a less than 20mV signal when I whistle into the element by itself (not connected to the mic).? I get signals of 50 - 100mV out at the white wire but before the connector.? Someone put a different element in there sometime before 2019, when I bought the TR7 that came with this mic.
The connection of the circuit is series cap --- primary || secondary -- series cap.? Transformer is 3 wires, so the cold sides of the windings are common-connected.
I'll be redoing all the connections and reassembling the 7077 with better workmanship.? I may not be able to avoid electrical tape but I'll at least know that the solder connections are good.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with
secure email.
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Plate blocking cap? It's a TDK 1700pf 20kv.
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Plate blocking cap? It's a TDK 1700pf 20kv.
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Warning on the 7077 (and any plastic Astatic mic)
As I grind my way through figuring what is wrong with this mic and how to repair it, I came upon an "O Cr@p!" moment when trying to disassemble it.
You see, the wiring that came up through the vertical bit to the head had fallen down and was flopping around loose, with the base.? Looking at? the inside of the head, I saw a phillips screw and throught, "Great!, I will remove the head from the stand and then I can feed the wiring up through the stand, then through the head."? and so on.
Dueing manufacture, the head is assembled to the base and held in place by that screw.? AND with glue!? The result is, if you're expecting the head to come off the base after removing the screw, it will but not in the way that you'd expect.? It broke.
Upon looking at the break, I could see evidence of glue that was the undoing of this mic.? Seeing that there was glue, I wondered if i could just do some "airplane glue" type joinery (IOW, was the glue similar to PVC pipe cement?).? It appears that I was correct and the head is back on the base but I'm going to be careful with it now.
If you lose the wiring through the base, the best way to get it back will be to fish some string down through the head and base and pull it back up that way.
It's a minor thing but may be useful to someone in the future.
I'm still troubleshooting the mic itself.? From what I'm seeing, the element in my mic is low-Z (hence the 400 ohm resistance across its terminals0..? Looking on my scope at 20 mV/div, I get a less than 20mV signal when I whistle into the element by itself (not connected to the mic).? I get signals of 50 - 100mV out at the white wire but before the connector.? Someone put a different element in there sometime before 2019, when I bought the TR7 that came with this mic.
The connection of the circuit is series cap --- primary || secondary -- series cap.? Transformer is 3 wires, so the cold sides of the windings are common-connected.
I'll be redoing all the connections and reassembling the 7077 with better workmanship.? I may not be able to avoid electrical tape but I'll at least know that the solder connections are good.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Re: TR4310 HF Transceiver
On 2025-02-05 03:56, atlasstuff wrote: I would imagine that a Teensy board would be well capable of acting as
a DSP processor, Jerry. Would be an interesting project. *** Indeed. Somebody told me about a "speech processor" that he cobbled together out of commercial/professional audio equipment. He basically chopped the speech spectrum into several sub-bands. Clipped each sub-band and re-filtered it, then put them all together again. I think a Teensy could do that. I have 4 Teensy 4.0's in my junkbox. - Jerry
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Re: TR-4C change the NB switch to do RF output?
Of course, most of this has been rendered obsolete by cheap power meters.? I have two in-line with my Icom and Drake stuff by virtue of my C-4 and a built-in meter in my Nye Viking tuner.? Surprisingly, the 9V battery in that tuner lasts 2-3 years before replacement of the 9V battery is needed,? I never use the push-button but I do test it before selling anything that has that feature...
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Wednesday, February 5th, 2025 at 2:01 PM, Gary WB6OGD via groups.io <winbladgary@...> wrote:
I am not sure if you can do it on a C line but on my T-4X I was able to remove the spring so I could leave the switch
in either position.? YES, original IS really clunky!
?
73,
Gary
WB6OGD
?
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Re: TR-4C change the NB switch to do RF output?
I am not sure if you can do it on a C line but on my T-4X I was able to remove the spring so I could leave the switch
in either position.? YES, original IS really clunky!
?
73,
Gary
WB6OGD
?
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Hey, folks, I haven't forgotten you!? I went to the doctor today for my foot problems and he has told me to stay off my feet for today and gradually going back to light activity tomorrow.? Plantar fasciitis is painful and nasty, so I am following his advice after a second shot.
I need to make sure that I have enough baggies or containers for what I'll be sending out.
The common stuff will be fairly cheap but I'll have to limit quantities because everyone seems to want the same parts ;-)? Whilst we all wait, make sure that some of the rare stuff isn't needed anywhere.? There are some UHF and power parts here, which will be put on that auction site in a while.? Shipping in the USA I will try to keep as cheap as possible, so I predict in the $5 range.? Going to try and use regular first class in 6 x 9 envelopes.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Re: Drake TR7, TX issue any ideas?
Update: Checked drivers, no leakage.. How ever CR1402 is done and now identifies it self as a resistor, however I assume CR1402 has little to do with TX and only RX/Calibrator signal? Any ways waiting for Ebug to deliver me a new MPN 3404.
So not exactly home run just yet..
Thanks, Michael.
?
One of mine had a leaky driver transistor that caused all sorts of weird stuff. CAREFULLY check the voltage on the base of the drivers. It should be zero in RX. I would not measure directly at the transistors because the risk on inadvertently your probe to the collector and instantaneously destroying the drivers is too great. Remove the four screws on the right side securing the PA deck and you can pull the whole unit up far enough to perch it on top without disconnecting any wires.
On Tue, 4 Feb 2025 21:54:35 +0100
"Michael Jensen via " <kavigal=[email protected]> wrote:
> Okay, ground strap added, not much difference, but makes really good sense!
> Anode on CR1501 RX = close to 0Volt, TX = 11.5Volt
> Junction CR1502/CR1503 RX = 10.32Volt, TX = Unstable - constant cycle
> between ~0Volt to ~364mv
> Drive was all the way down/cw mode, when measurements was done.
> What you say? Looks okay beside the CR1502/CR1503 during TX.
>
> Thanks, Michael.
>
> On Tue, Feb 4, 2025 at 12:03?PM Michael Jensen via <kavigal=
> [email protected]> wrote:?
>
> > Thanks Jim!
> >
> > I'll get on it asap and keep the thread updated :).
> >
> > /Michael.
> >
> > On Tue, Feb 4, 2025 at 2:25?AM Jim Shorney via <jimNU0C=?
> > [email protected]> wrote:?
> >?
> >>
> >> You may need to check your internal grounds, including all screws and any
> >> copper fingers attached to boards. As well, the board cage covers need to
> >> be attached with all screws, snug but not over tightened. But first add the
> >> ground strap to the high pass filter module as shown in the attached photo.
> >> This will help with stability.
> >>
> >> Also check the predriver gain adjustment pot. In a healthy TR7 with the
> >> ALC adjustment set for 150 Watts on 20 Meters you should get close to 100
> >> Watts on 10 and 15. This is normal. The ALC and predriver gain adjustments
> >> work together and if mis-adjusted can cause issues.
> >>
> >> You may also want to test the PIN diodes. Procedures are posted on the
> >> internet and in this group.
> >>
> >> On Mon, 03 Feb 2025 08:53:27 -0800
> >> "Michael Jensen via " <kavigal=[email protected]> wrote:
> >>?
> >> > Hardly been using it for TX until recently, then I notice that on 10?
> >> Meter output is close to 2.5 watts..?
> >> > Okay, not much.. On 15 meters the current draw is close to 31 amps to?
> >> produce 100watts! Quite a bit.?
> >> > more reasonably 21-22 amps on other bands.
> >> > So went for an TX alignment, if I crank up the pre drive I can get it?
> >> up to ~60 watts on 10 meter?
> >> > obviously not a good scenario and the dr7 board definitely does not?
> >> like it as the display starts to be all over the place during TX,?
> >> > with pre drive fully cranked up 40 Meters the PA self oscillates, not?
> >> good.?
> >> > So my thoughts, something in the pre drive section or bandpass maybe?
> >> > Looking for any suggestions before going nuts down that route.
> >> > Thanks on advance!
> >> > Best Regards, Michael - oz8abr?
> >>
> >> --
> >>
> >> 73
> >>
> >> -Jim
> >> NU0C
> >>
> >>
> >>
> >>
> >>
> >>? ?
> >
> >?
>
>
>
>
>
--
73
-Jim
NU0C
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Re: AC-4 Power Supply 10K Bias Trimmer Replacement
Why do the mounting fins matter?
The more common lockwasher and nut mount seems to be an OK replacement.
Thanks,
KD4E
toggle quoted message
Show quoted text
Hi Joe,
Try oldradioparts.net. Mark Oppat stocks literally thousands of potentiometers in every possible configuration, and will even customize them for you if needed. Very reasonable prices for unobtainium parts.
73,
Graham N6GH
On Feb 3, 2025, at 3:17?PM, Joe W7BWA via groups.io <W7BWA@...> wrote:
?
I purchased an AC-4 power supply and noticed one of the 3 lugs was snapped off.
Lots of 10Ks out there, but not with two mounting fins for the case.
Has anyone replaced these and found a suitable replacement?
Many thanks! 73.
--
Joe - W7BWA
Custer, WA
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Any. other symptoms? ?So far, could be a relay issue.
Ron
Any update on your problem? I am having? a similar problem with no grid current.
?
Jake
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TR-4C change the NB switch to do RF output?
Has anyone done this? Using the push button switch is so clunky to use! If you've done it, just what was involved??
73, Dave KD5FX
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Ron
Any update on your problem? I am having? a similar problem with no grid current.
?
Jake
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Re: TR4310 HF Transceiver
Well, the SP75 sounded OK. The pre-clipping compressor stage was quite good by itself (0 dB clipping selected).
?
Some LF cut in evidence when it's in-circuit, which the locals commented upon, but DX might not. The microphone input impedance of the processor is quoted as 1 MOhm which will further emphasise the lively HF-end of the 444's response. I'll try a genuine Drake 7077 microphone with it. On it's own, the 7077 sounds very bland / mediocre to my ears - not unpleasant, but nothing special either.
?
I would imagine that a Teensy board would be well capable of acting as a DSP processor, Jerry. Would be an interesting project.
?
?
[The TR7 is back on top of the ops. and maintenance pile now. That has a 10xx serial. I added the 470 kOhm resistor on the back of the microphone connector on that, whereas my 10k serial TR7 already had it. Had a few good contacts with it on 40 m SSB this morning. They clearly could not hear the -50 dBc, or so, artifacts it has on the transmit audio. I will change a few of the old capacitors on the DR7 and Transmit Exciter boards and see if that affects a cure.]
?
Regards,
?
Mark, G4FPH.
?
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Re: TR4310 HF Transceiver
Yeah, I think I would go with that... On Tue, 04 Feb 2025 20:26:14 -0800 "jerry-KF6VB via groups.io" <jerry@...> wrote: Or I could use that SP75 in the closet :). -- 73 -Jim NU0C
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Re: TR4310 HF Transceiver
On 2025-02-04 02:39, atlasstuff wrote: on the front. I'm a big fan of the Datong 'ASP' Automatic RF Speech
Processor units, made in the UK many years ago. The SP75 uses the
filter method (at 459 kHz) to create it's SSB, while the Datong uses
the phasing method. *** I just had an interesting thought. I bet I could do an RF speech processor in software. I have a few Teensy 4.0 processor sticks - they have a very powerful audio library - with oscillators, mixers, filters etc. And it can be run much faster than the standard 44k samples per second. I could make a phasing SSB generator - clipper - phasing SSB receiver - all in software. Or I could use that SP75 in the closet :). - Jerry, KF6VB
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Re: Drake TR7, TX issue any ideas?
One of mine had a leaky driver transistor that caused all sorts of weird stuff. CAREFULLY check the voltage on the base of the drivers. It should be zero in RX. I would not measure directly at the transistors because the risk on inadvertently your probe to the collector and instantaneously destroying the drivers is too great. Remove the four screws on the right side securing the PA deck and you can pull the whole unit up far enough to perch it on top without disconnecting any wires. On Tue, 4 Feb 2025 21:54:35 +0100 "Michael Jensen via groups.io" <kavigal@...> wrote: Okay, ground strap added, not much difference, but makes really good sense!
Anode on CR1501 RX = close to 0Volt, TX = 11.5Volt
Junction CR1502/CR1503 RX = 10.32Volt, TX = Unstable - constant cycle
between ~0Volt to ~364mv
Drive was all the way down/cw mode, when measurements was done.
What you say? Looks okay beside the CR1502/CR1503 during TX.
Thanks, Michael.
On Tue, Feb 4, 2025 at 12:03?PM Michael Jensen via groups.io <kavigal=
[email protected]> wrote:
Thanks Jim!
I'll get on it asap and keep the thread updated :).
/Michael.
On Tue, Feb 4, 2025 at 2:25?AM Jim Shorney via groups.io <jimNU0C=
[email protected]> wrote:
You may need to check your internal grounds, including all screws and any
copper fingers attached to boards. As well, the board cage covers need to
be attached with all screws, snug but not over tightened. But first add the
ground strap to the high pass filter module as shown in the attached photo.
This will help with stability.
Also check the predriver gain adjustment pot. In a healthy TR7 with the
ALC adjustment set for 150 Watts on 20 Meters you should get close to 100
Watts on 10 and 15. This is normal. The ALC and predriver gain adjustments
work together and if mis-adjusted can cause issues.
You may also want to test the PIN diodes. Procedures are posted on the
internet and in this group.
On Mon, 03 Feb 2025 08:53:27 -0800
"Michael Jensen via groups.io" <kavigal@...> wrote:
Hardly been using it for TX until recently, then I notice that on 10 Meter output is close to 2.5 watts..
Okay, not much.. On 15 meters the current draw is close to 31 amps to produce 100watts! Quite a bit.
more reasonably 21-22 amps on other bands.
So went for an TX alignment, if I crank up the pre drive I can get it up to ~60 watts on 10 meter
obviously not a good scenario and the dr7 board definitely does not like it as the display starts to be all over the place during TX,
with pre drive fully cranked up 40 Meters the PA self oscillates, not good.
So my thoughts, something in the pre drive section or bandpass maybe?
Looking for any suggestions before going nuts down that route.
Thanks on advance!
Best Regards, Michael - oz8abr --
73
-Jim
NU0C
-- 73 -Jim NU0C
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Gary WB6OGD
DavidC KD4E
Jim Shorney