micro-stripline SWR meter
Hello All,
I'm looking for a low cost, high quality SWR meter solution I can use with an Arduino project.? Anyone made this "stripline" solution?? Looks interesting.
I would rather not etch my own board or hunt down the parts as time is money...anyone have a kit of the thing or know where I could find one?? I really just want the board and non-meter parts...I don't need the analog meter.
Thanks,
Kurt-ae6uj
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QRP Guys regen rx build (Was: Tube Regenerative Receiver 12SN7/12V6)
Tomorrow (Mon.) may be the "big day" for me and Alex.? Together we are assembling the QRP Guys K8TND Regenerative Receiver Kit <?, a 4.5 to 12.7 MHz Hartley circuit.
There are only about a dozen components left to install, both electronic and mechanical before the proverbial "smoke-test".
The most difficult step will be winding the toroidal transformer (only because he's never done it before).? I decided to wind the main winding to show him how to do it then let him do the Antenna and Tickler windings.??
This morning, I checked his soldering under high magnification and didn't find any joints that weren't acceptable.? Not perfect but absolutely -much- better than my soldering when I was 10 Y/O (he's 9).? Until I reviewed the photographs I shot, I didn't notice that he wasn't holding the iron handle at the balance point (I think I may have spooked him when I told him that past the handle insulator it was very hot).? He was holding it way back near the end where the cable enters.? ?Now I'm even more amazed at how well he did.
More tomorrow after the end of our session.
73.......Steve Smith WB6TNL
? ? ? ? ? ? ? ? "Snort Rosin"?
??
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On 12/28/2019 9:28 PM, Michael Maiorana
wrote:
Straight from the horse's mouth.
Thank Jim!
You are welcome Mike.
Can you clarify if the stated gain
includes the audio pre-amp stage consisting of Q14?
The gain figures did not include Q14.? That stage adds another 10 dB
of power gain.
I'd like to build it as designed,
but those audio transformers are tough to find.
Try this:
Any of the nominal 1K primary transformers to 8 Ohms will work
fine.? I've used 500, 800, 1K, and 1.2K primaries in various
incarnations of that push-pull amplifier.? 800 Ohm primary was used
in the simulation circuit that produced the output levels that I
quoted in the previous email.? We used the 500 Ohm version in the
NorCal 2N2/XX rigs.
Thanks again and best 72
Mike M.? KU4QO
72 and keep having fun;? Happy New Year to all,
Jim, K8IQY
On Sat, Dec 28, 2019 at 10:57
AM Jim Kortge < jim.k8iqy@...> wrote:
On 12/28/2019 7:58 AM, Michael Maiorana wrote:
Can
someone tell me what the expected voltage or power
gain should be in the audio amp circuit in the 2n2/40+
receiver? The other receiver stages are clearly marked
in the schematic with their expected gains. I'm trying
to understand?the gain distribution in the receiver.
Mike,
That audio amplifier has a voltage gain of 60 dB, and a
power gain of 83 dB.? The input impedance is 1700 Ohms and
the output impedance is 8 Ohms as designed.? It can supply
125 millwatts of output power into 8 Ohms with a drive level
of 1 millivolt.? It is also dead quiet with no input
signal.? You won't know that it is "on" until it has an
input signal.? No hiss at all.? Anything else you would like
to know?
72 and keep up the good work,
Jim, K8IQY
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Straight from the horse's mouth. Thank Jim!
Can you clarify if the stated gain includes the audio pre-amp stage consisting of Q14?
I'd like to build it as designed, but those audio transformers are tough to find.?
Thanks again and best 72 Mike M.? KU4QO
On Sat, Dec 28, 2019 at 10:57 AM Jim Kortge < jim.k8iqy@...> wrote:
On 12/28/2019 7:58 AM, Michael Maiorana
wrote:
Can someone
tell me what the expected voltage or power gain should be in
the audio amp circuit in the 2n2/40+ receiver? The other
receiver stages are clearly marked in the schematic with their
expected gains. I'm trying to understand?the gain distribution
in the receiver.
Mike,
That audio amplifier has a voltage gain of 60 dB, and a power gain
of 83 dB.? The input impedance is 1700 Ohms and the output impedance
is 8 Ohms as designed.? It can supply 125 millwatts of output power
into 8 Ohms with a drive level of 1 millivolt.? It is also dead
quiet with no input signal.? You won't know that it is "on" until it
has an input signal.? No hiss at all.? Anything else you would like
to know?
72 and keep up the good work,
Jim, K8IQY
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Jim,
Thanks for jumping in to help us out!
The 2n2xx is an interesting design, especially these days when so much is hidden in large IC's and DSP code.
There's much to be learned from going back to basics.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Sat, Dec 28, 2019 at 07:57 AM, Jim Kortge wrote:
On 12/28/2019 7:58 AM, Michael Maiorana wrote:
Can someone tell me what the expected voltage or power gain should be in the audio amp circuit in the 2n2/40+ receiver? The other receiver stages are clearly marked in the schematic with their expected gains. I'm trying to understand?the gain distribution in the receiver.
Mike,
That audio amplifier has a voltage gain of 60 dB, and a power gain of 83 dB.? The input impedance is 1700 Ohms and the output impedance is 8 Ohms as designed.? It can supply 125 millwatts of output power into 8 Ohms with a drive level of 1 millivolt.? It is also dead quiet with no input signal.? You won't know that it is "on" until it has an input signal.? No hiss at all.? Anything else you would like to know?
72 and keep up the good work,
Jim, K8IQY
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Re: 7 MHz Oscillator Ideas - good enough
Not meaning to hijack but ask question, I have both a rx/tx 40m and a 20m transceiver ?kitted by Ramsey so if I use my regulated power supply my kits won¡¯t drift badly. Also I was told by friend to Band pass Filter upgrade for FCCcompliance... should I build it¡¯s own box attached to output or? Thank you for your time.Mark kc0mh
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On 12/28/2019 7:58 AM, Michael Maiorana
wrote:
Can someone
tell me what the expected voltage or power gain should be in
the audio amp circuit in the 2n2/40+ receiver? The other
receiver stages are clearly marked in the schematic with their
expected gains. I'm trying to understand?the gain distribution
in the receiver.
Mike,
That audio amplifier has a voltage gain of 60 dB, and a power gain
of 83 dB.? The input impedance is 1700 Ohms and the output impedance
is 8 Ohms as designed.? It can supply 125 millwatts of output power
into 8 Ohms with a drive level of 1 millivolt.? It is also dead
quiet with no input signal.? You won't know that it is "on" until it
has an input signal.? No hiss at all.? Anything else you would like
to know?
72 and keep up the good work,
Jim, K8IQY
|
Can someone tell me what the expected voltage or power gain should be in the audio amp circuit in the 2n2/40+ receiver? The other receiver stages are clearly marked in the schematic with their expected gains. I'm trying to understand?the gain distribution in the receiver.
Thanks! Mike M. KU4QO
|
Re: OT:Tube Regenerative Receiver 12SN7/12V6
It was a good day for me and Alex (9 y/o).? He's completed about half (or more) of the kit assembly.? He used a Hakko 936 clone station I had kicking around in the junque and a roll of 60/40 solder that had traipsed around with me in my service truck for about 20 years before I retired.? Good mojo there.?
I must say, he took to soldering like a duck to water.? After showing him the basics, he jumped right in; bending leads, placing parts, soldering and trimming leads where necessary.? I think I had to 'coach' him for about 5% of the soldering, otherwise he did it all on his own while I just sat back and snorted rosin fumes, HA!? He's made about 70 solder connections so far with -no- cold joints, no bridges and no solder splashes!?
I was 'picking' parts and handing them to him but towards the end of the session he was telling me what value part to hand him.? We did do some basic tests to make sure the power supply section was functioning properly which consisted of checking to see if the power LED illuminated and he also measured voltages at 3 points in the circuit (9 V, 8.3 V and 7.5 V regulated).? He was totally jazzed, to say the least.?
Other than learning how to solder, he learned how identify a diode, resistor and capacitor a now to read parts values.? He also learned how a diode functions (and was quite impressed).? He says, "I know none of my friends have done this!"
So, we'll continue on Monday and hopefully get to try a 'smoke test', of the audio section at the least.
73.......Steve Smith WB6TNL
? ? ? ? ? ? ? ? "Snort Rosin"
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Re: OT:Tube Regenerative Receiver 12SN7/12V6
Amazing! Only thing my 19 yr old grandson is interested in is girls and video games.? I have a Le Sauteur de Bayou, receiver eventually used in the Bayou Jumper transceiver that am going to expand range on.? The circuit is a duplicate of the one you are building ( or probably the other way around ).? It is a great regenerative receiver, well behaved.
GL Curt KB5JO
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Re: Anyone Built the Rose 80?
For anyone whom this thread might have discouraged from building this rig,? I thought I better tell the rest of the story....??? I removed T3 and C43 from the circuit and found the power out was then stable across the 100 KHz tuning range.?? However the waveform on the output was horrible.? I was hoping maybe the low pass filter would clean it up.? Not so. ?? So I thought about home brewing a new band pass filter for a while, but the designs I found on-line all involved a much higher parts count and my board is already very congested, so I thought maybe I would try living with the variable power output for a while and maybe someday build the transmitter for a 3rd time making room for? a different band pass filter.?? So I put C43 and T3 back in the circuit and guess what ...?? power stable across the tuning range within about .1 watt and a nice clean sine wave at the output.?? So all I can figure is I had something wired incorrectly (on 2 builds).??
Its not all good news though;? I've lost my sidetone, which is curious as the TR switch (which I understand leaks a little to provide the sidetone) ? is on a separate board I hadn't been messing with.???
So if anyone is considering building this rig, don't let my experience dissuade you, it has a sensitive receiver, nice qsk and RIT and had a pleasant sidetone.??
/John? W7SWB
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Re: OT:Tube Regenerative Receiver 12SN7/12V6
OK.? I have a bunch of regen stuff archived and this was the only one that cam close to fitting your description.
But it turns out that schematic doesn't match the actual article from P.E. Oct. '59 which is closer but still not a match.
<?
Coincidentally, my grandson and I are assembling a regen during his "winter break" from school (remember when it was called Christmas vacation?).? ?It's not toobs but a QRP Guys K8TND regenerative receiver kit.?
Thus far we've sorted all of the parts and compared them to the BOM while I explained in the simplest terms their function.? He surprised me when he told me that "10K" meant 10,000, HA!? This will be his first time soldering, although I've had him de-solder some stuff just to get the idea of handling a hot iron and how solder melts.? Wish us luck!
73.......Steve Smith WB6TNL
? ? ? ? ? ? ? ?"Snort Rosin"
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Re: OT:Tube Regenerative Receiver 12SN7/12V6
No it isn't that one though the 12V6 is wired in similar fashion.? There are only two tubes.? 1/2 of the 12SN7 is a preamp for the 12V6, the other half is a regenerative detector, believe in a Hartley configuration. There is a 2.5 mH pi wound choke between the oscillator plate to the grid of the other half of the 12SN7.? I will draw the schematic this weekend and send that.? I think the design came from an op's web page.
The radio works pretty well, tuning and regeneration aren't touchy.? For sure I didn't arrive at this lashup cuz am not that smart.
Curt KB5JO
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Re: OT:Tube Regenerative Receiver 12SN7/12V6
Curt, is it this one from Oct. '59 Popular Electronics? 73.......Steve Smith WB6TNL? ? ? ? ? ? ? ? ?"Snort Rosin" 
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Re: OT:Tube Regenerative Receiver 12SN7/12V6
It sounds similar?to a regen by Newkirk in the September 1992 QST, also reprinted in the book QRP power. It does use two dual section tubes. I built it and it's a good performer.?
73-
Nick, WA5BDU
On Wed, Dec 25, 2019 at 4:57 PM Curt via Groups.Io <rhulett1= [email protected]> wrote: Awhile ago, when the regenrx yahoo group was active, I built several different iterations of regenerative receiver on the same small chassis.? It started as a twinplex, then changed to a 6SJ7 detector / 6SN7 dual audio amp, then the version it is now.? The problem is I can't remember or find the article it came from.? It uses a both sections of a 12SN7 as a regen detector/Audio preamp and the 12V6 as an audio amplifier.?? It has an audio output transformer but no interstage choke.? The original used 6 volt filaments but I used 12 so could power from the shack 13.8 PS.
Anyway, after pulling the radio off of the shelf, was listening for awhile.? It tunes about 7-10 Mhz and receives AM, Sideband, and CW pretty well.? Appreciate if someone can remind me of where got the article to build this one.? Or, point me to a group with folks building tube regenerative receivers.
Curt KB5JO
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OT:Tube Regenerative Receiver 12SN7/12V6
Awhile ago, when the regenrx yahoo group was active, I built several different iterations of regenerative receiver on the same small chassis.? It started as a twinplex, then changed to a 6SJ7 detector / 6SN7 dual audio amp, then the version it is now.? The problem is I can't remember or find the article it came from.? It uses a both sections of a 12SN7 as a regen detector/Audio preamp and the 12V6 as an audio amplifier.?? It has an audio output transformer but no interstage choke.? The original used 6 volt filaments but I used 12 so could power from the shack 13.8 PS.
Anyway, after pulling the radio off of the shelf, was listening for awhile.? It tunes about 7-10 Mhz and receives AM, Sideband, and CW pretty well.? Appreciate if someone can remind me of where got the article to build this one.? Or, point me to a group with folks building tube regenerative receivers.
Curt KB5JO
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Not that I have this all clear in my head.
Even if 90 degrees out of phase, the instantaneous power when current is at -45 degrees and voltage at +45 degrees
is half of your 54.6 kVA.? But 180 degrees later the same level of instantaneous power is moving in the opposite direction.
So there really is a huge amount of power circulating between the inductor and the capacitor.
Do I have that right?
Imagine sending CW with no key shaping, the transmitter goes from 0 watts to 100 watts in a microsecond or less.
How long does it take the mag loop currents to build up to that 54.6 kVA?
And then I assume the mag loop keeps radiating after key up for about the same amount of time.
I may have to kick off LTSpice and see how this really works.
My understanding of resonance more than a little shaky,
Jerry
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On Tue, Dec 24, 2019 at 10:29 AM, Jerry Gaffke wrote:
Which is to say that the current and voltage are not both high at the same time.
They are out of phase.
Hide quoted text
?
On Tue, Dec 24, 2019 at 09:16 AM, Nick Kennedy wrote:
Remember that when you multiply the current times the voltage across the capacitor, you are calculating reactive power, not watts.?
?
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Which is to say that the current and voltage are not both high at the same time.
They are out of phase.
toggle quoted message
Show quoted text
On Tue, Dec 24, 2019 at 09:16 AM, Nick Kennedy wrote:
Remember that when you multiply the current times the voltage across the capacitor, you are calculating reactive power, not watts.?
?
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Remember that when you multiply the current times the voltage across the capacitor, you are calculating reactive power, not watts.?
In an example from , take a 10¡¯ circumference loop 0.5¡± in diameter at 14 MHz and 100 W. The loop current is 18.6 A and voltage across the capacitor is 2,967 volts, both RMS. So the reactive power is their product which is 54.6 kVAR (kilo-volts reactive).
In this example, the loss resistance and radiation resistance are about equal at 0.075 and 0.074 ohms for 50% efficiency.
The real power would be I^2 times R or 18.4^2 times 0.149 ohms giving ... 50 W.? Oops, that should be 100 W so something¡¯s off in my thinking or in this calculator.
I do believe it will come out. But Mrs. Santa Claus is calling. To be continued.
73-
Nick, WA5BDU
On Tue, Dec 24, 2019 at 12:45 AM Jerry Gaffke via Groups.Io <jgaffke= [email protected]> wrote: Got to be the "same place and time" thing.
No way a system that small can contain anything like a megawatt of power.
On Mon, Dec 23, 2019 at 12:17 PM, Jerry Gaffke wrote:
Good question.
I see two possible answers, and will expose my ignorance by saying I've no idea which dominates:
1)? High currents and high voltages can both be present, but perhaps not at exactly the same place and time.
2)? We have some energy going in from the transmitter, some energy being radiated out,?
and a whole lot of energy stored in that high Q resonant circuit.
Jerry
On Mon, Dec 23, 2019 at 08:12 AM, Bill Cromwell wrote:
I have noticed that (30,000 Volts at 30 Amps) thing before. That is 900,000 Watts. From whence comes 900,000 (that is nine hundred thousand) Watts?
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Got to be the "same place and time" thing.
No way a system that small can contain anything like a megawatt of power.
toggle quoted message
Show quoted text
On Mon, Dec 23, 2019 at 12:17 PM, Jerry Gaffke wrote:
Good question.
I see two possible answers, and will expose my ignorance by saying I've no idea which dominates:
1)? High currents and high voltages can both be present, but perhaps not at exactly the same place and time.
2)? We have some energy going in from the transmitter, some energy being radiated out,?
and a whole lot of energy stored in that high Q resonant circuit.
Jerry
On Mon, Dec 23, 2019 at 08:12 AM, Bill Cromwell wrote:
I have noticed that (30,000 Volts at 30 Amps) thing before. That is 900,000 Watts. From whence comes 900,000 (that is nine hundred thousand) Watts?
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Jim Kortge, K8IQY
Nick Kennedy