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Sodapop kits

Stan N8HN
 

Perhaps I should ask, is this the band module you have or the entire kit? I’m thinking it’s not the entire kit? I’m interested in the transceiver kit, I understand that they are limited runs but was hoping otherwise.

Let me know...

Thanks Steve,

Stan-N8HN


Begin forwarded message:

From: "Stan N8HN via Groups.Io" <K3kx3@...>
Date: February 12, 2020 at 08:52:23 EST
To: kd1jvdesigns@groups.io
Subject: Re:  [kd1jvdesigns] Sodapop kits
Reply-To: kd1jvdesigns@groups.io


I’m interested in a kit Steve

On Feb 11, 2020, at 20:33, Steven Weber <steve.kd1jv@...> wrote:



I do. I actually have 3 kitted up and ready to go. Anyone else? Send me a PM. Link at the bottom..

 

 

Hi Steve:

 

Do you have any sodapop 40m kits or circuit boards available?

 

Regards

Dave

 

 

Soda Pop

Stan N8HN
 

Hi Steve,
I’m interested in a Soda POP kit.

Thanks

Re: Sodapop kits

Stan N8HN
 

I’m interested in a kit Steve

On Feb 11, 2020, at 20:33, Steven Weber <steve.kd1jv@...> wrote:



I do. I actually have 3 kitted up and ready to go. Anyone else? Send me a PM. Link at the bottom..

 

 

Hi Steve:

 

Do you have any sodapop 40m kits or circuit boards available?

 

Regards

Dave

 

 

Re: Sodapop kits

Greg DL3GJ
 

Hi, I'd be interested in 30 or 20m version if available in the nearest future...

Regards Greg

Re: Should I do another batch of Slop Bucket kits? #poll

AA9GG
 

Steve...do you have a website with all you LATEST kits???


On Mon, Feb 10, 2020 at 4:33 PM Peter <peter.vk3pf@...> wrote:
Given local activity, 40 m is my preference. But I will definitely have one regardless of the band.



--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com

Re: Sodapop kits

Steven Weber
 

I do. I actually have 3 kitted up and ready to go. Anyone else? Send me a PM. Link at the bottom..

 

 

Hi Steve:

 

Do you have any sodapop 40m kits or circuit boards available?

 

Regards

Dave

 

 

Sodapop kits

David Kukulka, AB9BZ
 

Hi Steve:

Do you have any sodapop 40m kits or circuit boards available?

Regards
Dave

Re: Should I do another batch of Slop Bucket kits? #poll

David Perry <bumbledp@...>
 

Not for me thanks.  Not interested in ssb on any hf band

David G4YVM 

Re: Should I do another batch of Slop Bucket kits? #poll

Peter
 

Given local activity, 40 m is my preference. But I will definitely have one regardless of the band.

Re: ATS-V5

poikaa3
 

   Any news on release date?

73 Rod W8GRI

Re: SB II #112 nearly done / searching the last building mistakes

Don, ND6T
 

Yes, U3 pins 4 and 5 are swapped in the schematic. See my message posting #610.

Indeed it would be best to resolve the confusion before attempting to repair the circuit problem. I am no help there! I'm not familiar with your oscilloscope. If it does not automatically compensate for the probe change from different scales (some do that) then you need to spend some time experimenting with it and becoming comfortable. Check to ensure that the scales track (use your calibration output to see if the measurement at 1 v/div is the same at .1 v/div, etc.). Be sure to frequency compensate your probe.
Looking at your photo of the voltage across the BNC jack it looks like the positive peaks reach 1.6 divisions and the negative peaks 1.8 divisions. That would be about 3.4 divisions peak-to-peak, right? At 20 millivolts/div and a 10X probe then that would be about .68 VPP (.2 X 3.4 ). That would be about a milliwatt output. We would rather see 50 VPP there.
Also at issue is the bandwidth of the instrument. Is it accurate at 14 MHz? Additionally, there is a bit of noise that widens the trace, so these are approximate values, good enough for comparison level checks. That is what is important.

So your levels are really low where you measured. Check at U3 pin 4. Check the level at pin 6. Work your way back.

Ensure that the signal that you are measuring is the expected frequency. Measure the period. That makes an oscilloscope very useful.

The most likely problem is a solder connection. They can be deceiving. With a continuity tester (or ohmeter) probe the pin where it just leaves the package and place the other probe at a point removed from that area somewhere (like a component, via, or pad) that should be directly connected. Try to test the continuity without accidentally pressing the pin down onto the pad while testing, therefore closing the connection that you are testing for an open. This is what happens to me on occasion. The connection looks good but isn't quite there.

Keep us posted! 73, Don

Re: SB II #112 nearly done / searching the last building mistakes

Sascha Bohnet | DL5SMB
 

I am just coming back from playing with the scope, trying to measure the peak-peak voltage.....

I am a bit confused as it seems as if the probe does not attenuate by factor 10 but amplify by 10.

I used  the  5V DC voltage from U1 as reference, switched the scope to "DC" and "0.1 V per Division" and saw the line go up 5 boxes - so one box should be 1 V then

So after switching back to "AC" I measured the output of the final again - about 1.6 boxes peak-peak  - so I assume that means 1.6 Volts.
This would also not contradict the pictures I sent yesterday - there you can the that the scope channel A was set to 20  mV (which makes magically 200mV) per division. There were about 8 boxes Peak-Peak visible, which would also make 1.6V.

This seems all way too low in my eyes.

Maybe the input to the final is just too small. However I can't see much of a signal at the drivers /  bases of Q3 and Q4.

By the way - I did measure the DC restitance of the gate of Q2 to Ground through L1. It's about 0.77 Ohm.

And another point: Is it possible that Pin 4 and 5 of U3 got mixed up in the schematic? I first thought the mixer was soldered in the wrong way, but noticed then that turning it would not make it like in the schematic.

Sascha

Re: SB II #112 nearly done / searching the last building mistakes

Sascha Bohnet | DL5SMB
 

I had not too much time yesterday - but I can at least answer some questions.

I built the SBII for 20M, so every test is run on 14.160 Mhz (start frequency). I run it with 13,6 Volts and the current drawn is 160mA when sending a CW signal. Like I wrote earlier, if the BIAS poti is turned fully ACC its 130mA. So I adjusted it to 160mA which is the same value for CW and SSB. However SSB can't be seen on the scope at all.
The RX draws only 40mA. And yes I am using a X10 probe with a dummy load (10 cm cable).

The VFO is calibrated , the BFO not yet. Need to figure out how I do this best......... I read somewhere for filter adjusting using an audio spectrum analyzer is one of the best ways.

Re: SB II #112 nearly done / searching the last building mistakes

Steven Weber
 

 

Be sure to calibrate. Otherwise the BFO can be off enough to affect power output since It’s not lined up well with the pass band of the IF filter until that is done.

 

KD1JV

 

 

Re: SB II #112 nearly done / searching the last building mistakes

Don, ND6T
 

I'm glad that you're getting back to health!
Yes, looks like you found another anomaly in voltage chart. The odd gate condition (Q2) is probably an artifact of the probing. But do check the DC resistance to ground and insure that it is close to zero ohms (a check of the connections through L1). The drain of Q23 should pull down slightly during transmit because of the ohmic losses of the supply chain. The photos of the signals seem like they might be OK but the frequency response of the probe and 'scope make it look cleaner than I would expect. Also, it would be more instructive if the voltage range (or estimated peak-to-peak voltage) was included. I assume that you were measuring with a 50 ohm load right at the BNC (not more than a few cm distant)? May I also assume that you are using a X10 probe? What voltage is your supply? What current is being drawn while transmitting a CW carrier? This would give us an idea of what power is being presented at the output load and the efficiency of the transmitter. What band are you on?
From what I can see, it appears to be working a bit at least.
73, Don

Re: SB II #112 nearly done / searching the last building mistakes

Sascha Bohnet | DL5SMB
 

Sorry for the really late reply. I had been sick and was really busy getting well again (you know what they say about the "man flu").

The TX led does light, if I switch to transmitting and I am using a electret capsule. But to try to rule out microphone problems, I use CW for testing.

I have an oscilloscope and tried to get an understanding of what might be wrong, but was not really successful.

But first again to the voltage chart, where I noticed some other thing in TX mode:

The Drain of Q2 should be 2,4 Volt  i think (instead of 5 Volt) , like the Base of Q1, right? The source of Q2 is 5 Volts.
I think there is a mixup in the chart, probably due to the pinout of the MMBF4416.

However i noticed that if i try to measure the voltage of the Gate of G2, this transistors seems to simply turn on and my power supply
needs to limit the current. Is this a usual behaviour?

I know that this is a special amplifier, but I wonder if simply applying the measurement tip, should trigger this. Seems a bit odd.


Now to the oscilloscope
First thing to check should be the final I think.

The voltage of the Drain of Q23 is 13,27 Volt in RX and 13,17 Volt in TX (both Voltages taken with the multimeter).
What is curious is, that the voltage seems to drop while transmitting. In the chart it seems to increase.

This is the picture of the signal at the Gate Q23. 
and this at the Drain Q23

So it looks at least as if the Mosfet is amplifying. However after the second toroid (L9) the signal gets attenuated again
It looks like this at the BNC jack

L9 seems to be okay, I desoldered it and checked its inductance which is as it should be (I don't remember the value anymore, i calculated it and compared).

Any ideas what might be wrong?

73 Sascha




AD9850 DDS based Antenna Tuner Adjustment Aid

Kurt Loken
 

Hello All,

Does anyone happen to have a BOM of the parts for KD1JV’s AD9850 DDS based Antenna Tuner Adjustment Aid? I’m going to build it and need to procure some of the components.

Thanks,

Kurt-AE6UJ

Re: It's all gone quiet on ATS V5

David Perry <bumbledp@...>
 

Well I guess  like Edison and his light bulbs,  apocryphal or not, now you know another way that doesn't work...

Chin up Steve 

David G4YVM 

Re: SB II #112 nearly done / searching the last building mistakes

Don, ND6T
 

You are correct about the voltage on Q3 collector. It's being fed constantly through T1, R12, L10, and F1.
The chart shows 5 V on the drain, not the gate. That voltage is wrong since it is being supplied through the PTT port of the controller which, in turn, is supplied by 3.3 volts. Therefore it should measure 3.3 volts. That same line feeds the PTT and key connections through R52 so you should also get 3.3 volts on those terminals in the initial idle condition.

The gate should measure at nearly open, perhaps 40 millivolts or so if anything. When the PTT (or key) is closed that will measure about half a volt without audio.

No, the note is cogent. The voltage on the gate will change with audio level or state of the VOX_EN bus.

When you close the key or press the push-to-talk button on the microphone does the TX (D3) indicator light? What are you using for a microphone?

Now that you have concluded the voltage checks it might be the time to begin signal tracing. Do you have an oscilloscope? Or perhaps an audio amplifier for signal tracing? A signal injector of some sort? An oscilloscope is handy but not necessary since simple gear will get you through this sort of thing.

73, Don

Re: SB II #112 nearly done / searching the last building mistakes

Sascha Bohnet | DL5SMB
 

As I am working myself through the voltage chart now... might it be that not everything there is correct?

In the RX chart at Q20 I am measuring 3,3V instead of 5V Gate voltage - without a microphone connected. I see the refernce
about audio mic input level, but this seems just a bit weird.

Nevertheless the next big difference I noticed - at least compared with my rig - is that at Q3 Collector I am always measuring 13.2 Volt.
RX or TX. Is that right? If I am interpreting the schematics the right way, I think this is as it should be, or am I reading it wrong?