Gees...really? I misspell it and it comes out
?? Even Hand
Sorry about that, Evan. I'd like to blame it on autocorrect...so I will!
Jack, W8TEE
On Sunday, December 23, 2018, 2:08:52 PM EST, Evan Hand <elhandjr@...> wrote:
The API rout would be a good compromise.? The thoughts that I had were along the line of more advanced filters, giving up some of the digital modes for noise reduction or digital voice modes.? Also (Really stretching) posibility of coordination of multiple SDTx to strange things like focus a programmable beam array on a station automatically.? Not that I know how to do any of these types of things, Just thinking out loud examples of what I might like to do with access to the software.
At this point we just have to hope that Hans gets well enough to actually put the kits on the market.
Good idea on the API
73
Evan
AC9TU
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The API rout would be a good compromise.? The thoughts that I had were along the line of more advanced filters, giving up some of the digital modes for noise reduction or digital voice modes.? Also (Really stretching) posibility of coordination of multiple SDTx to strange things like focus a programmable beam array on a station automatically.? Not that I know how to do any of these types of things, Just thinking out loud examples of what I might like to do with access to the software.
At this point we just have to hope that Hans gets well enough to actually put the kits on the market.
Good idea on the API
73
Evan
AC9TU
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Even:
I can appreciate Hans' reasons for keeping it closed, but all may not be lost. It is possible, if he could ever find the time, for Hans to write an API (Application Programmers Interface) for the application. By defining entry points into the code, he could have other experiment with the code. Even if the SMT32F103 is "filled", one could use one of the other series that has more software resources (flash and SRAM) and use it instead of the original. He could provide the core as a hex file, but have an API defined that would allow other to experiment.
I don't know if he would ever want to do that, but it would be interesting if he did.
Jack, W8TEE
On Sunday, December 23, 2018, 1:52:02 PM EST, Evan Hand <elhandjr@...> wrote:
I am in the same boat as Bill, KU8H.? I have a v4 in surgery right now for the relays and spurs mods and waiting for the QSX.? Only wish the software was open source.? I relay like the idea of a SDTx (software defined transceiver).? The biggest advantage is the fact that all of the functions are in software, which is negated to some extent by making the software closed.? May think about how to use the hardware on the QSX and write my own software.??
Happy Holidays to All
73
Evan
AC9TU
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I am in the same boat as Bill, KU8H.? I have a v4 in surgery right now for the relays and spurs mods and waiting for the QSX.? Only wish the software was open source.? I relay like the idea of a SDTx (software defined transceiver).? The biggest advantage is the fact that all of the functions are in software, which is negated to some extent by making the software closed.? May think about how to use the hardware on the QSX and write my own software.??
Happy Holidays to All
73
Evan
AC9TU
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Re: Tracing receive signal for low signal
Well ..so far, at least you have something on al the test points ...useful for reference if for nothing else ... the situation at TP 17 indicates to me bad/misaligned 12 mhz filter? or defective 12 mhz mixer? or messed up clk0? or defect in Q70 stage or open contacts M1/M2 or Q74 shorted/turned on (conducting)?? or ....?? One step at a time progressing at this point from front to back .. I prefer going back to front but we are where we are
Jim
On Sunday, December 23, 2018, 8:21:06 AM PST, Dave Space <davesspacebar@...> wrote:
Thanks I'll try those new measurements tonight.? Do the measurements so far say anything?? Seems like it's taking a lot more to get .1 vp-p output than jim's board from all test points.? The weird thing though is it mostly gets worse (requires more power to get .1v p-p audio) further along the receive path.?
For those other questions:
Yes everything on the radio seems to work, display, etc.? Tapping on components doesn't seem to change anything connections at least seem stable.? before changing the BFO I could hear only the strongest of signals but they were so faint and almost completely unintelligible.? Changing the BFO I can now pick up only really strong signals faintly and they are a bit more intelligible.? It's clear from the signal tracing it is taking a lot more power to get my audio to .1v p-p so clearly something interesting is going on here.? The real interesting part is the farther away from the antenna on the board the more power it takes to produce a .1v p-p audio output for the most part.
I have a tiny bit of experience using my signal generator / scope on a working fm/am radio kit I built recently?
(An nice little kit building the radio in sequence and testing each stage, teaches quite a bit)
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Hi,
I thought about it too. I have a V3 that is working and I am now holding out for the QSX from QRP Labs when they get it ready. I have other radios too so I passed on this one. Somebody else might actually need it to get on the air.
73,
Bill KU8H
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On 12/23/18 1:38 PM, Joel Caulkins/N6ALT wrote: Hi Jack,
I almost pulled the trigger on this as well, but thought I have a V4 just sitting on the shelf with a Nextion display all hooked up and updated and i haven't used it in a month or so or been motivated to stick it in a enclosure. Anyway looks fun.
Joel
N6ALT
--
bark less - wag more
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Hi Jack,
I almost pulled the trigger on this as well, but thought I have a V4 just sitting on the shelf with a Nextion display all hooked up and updated and i haven't used it in a month or so or been motivated to stick it in a enclosure. Anyway looks fun.
Joel
N6ALT
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SOLD.
--
Jon Titus, KZ1G
Herriman, UT USA
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Re: Tracing receive signal for low signal
Dave
Did you try the simple experiment of plugging in a 40m dipole? First adjust audio gain so you hear some noise. When you add the antenna the noise should increase unless the bfo is way off. If your audio is to scarce for your taste, consider an amplified speaker.
Curt
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Jon:
If it's not sold, I'll take it.
Jack, W8TEE
On Sunday, December 23, 2018, 12:23:40 PM EST, Jon Titus, KZ1G <tituskz1g@...> wrote:
uBITX transceiver for sale.? I built the radio but didn't use it beyond a few quick CW QSOs.? Unfortunately it's unlikely I'll use it again.? Well packaged and shipped in the USA.? Transceiver and shipping via UPS or USPS, $67 total.? Documentation included.? Paypal only: jontitus@....? (See photos.) This transceiver includes a 4-line LCD and programmed Arduino module for the RadI2Cino (Radio-I2C-Arduino) modifications.? (Documentation included.)? I installed this and it works.? This mod includes a different controller board, but you can revert to the original configuration if you wish.? I'll include the original plug-in control module, 2-line LCD, and the Arduino module so you can go back to the original configuration if you wish. The transceiver comes mounted on a wooden board with clear plastic front and rear panels.? You can use the radio as-is or put it in a case of your choice.? Instead of using the pushbutton in the incremental encoder rotary control I added a separate high-quality pushbutton.? The RadI2Cino modification required a second pushbutton for the VFO selection (A/B/Split). I removed the transmit/receive relay and replaced it with a front-panel switch.? Two small LEDs indicate the status (red-transmit and green, receive).? I'll include this relay in case you want to use it instead of the switch.? My front panel includes an SPDT switch for power, but I didn't connect it. -- Jon Titus, KZ1G Herriman, UT USA  
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uBITX transceiver for sale.? I built the radio but didn't use it beyond a few quick CW QSOs.? Unfortunately it's unlikely I'll use it again.? Well packaged and shipped in the USA.? Transceiver and shipping via UPS or USPS, $67 total.? Documentation included.? Paypal only: jontitus@....? (See photos.) This transceiver includes a 4-line LCD and programmed Arduino module for the RadI2Cino (Radio-I2C-Arduino) modifications.? (Documentation included.)? I installed this and it works.? This mod includes a different controller board, but you can revert to the original configuration if you wish.? I'll include the original plug-in control module, 2-line LCD, and the Arduino module so you can go back to the original configuration if you wish. The transceiver comes mounted on a wooden board with clear plastic front and rear panels.? You can use the radio as-is or put it in a case of your choice.? Instead of using the pushbutton in the incremental encoder rotary control I added a separate high-quality pushbutton.? The RadI2Cino modification required a second pushbutton for the VFO selection (A/B/Split). I removed the transmit/receive relay and replaced it with a front-panel switch.? Two small LEDs indicate the status (red-transmit and green, receive).? I'll include this relay in case you want to use it instead of the switch.? My front panel includes an SPDT switch for power, but I didn't connect it. -- Jon Titus, KZ1G Herriman, UT USA  
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Re: Tracing receive signal for low signal
Thanks I'll try those new measurements tonight.? Do the measurements so far say anything?? Seems like it's taking a lot more to get .1 vp-p output than jim's board from all test points.? The weird thing though is it mostly gets worse (requires more power to get .1v p-p audio) further along the receive path.?
For those other questions:
Yes everything on the radio seems to work, display, etc.? Tapping on components doesn't seem to change anything connections at least seem stable.? before changing the BFO I could hear only the strongest of signals but they were so faint and almost completely unintelligible.? Changing the BFO I can now pick up only really strong signals faintly and they are a bit more intelligible.? It's clear from the signal tracing it is taking a lot more power to get my audio to .1v p-p so clearly something interesting is going on here.? The real interesting part is the farther away from the antenna on the board the more power it takes to produce a .1v p-p audio output for the most part.
I have a tiny bit of experience using my signal generator / scope on a working fm/am radio kit I built recently?
(An nice little kit building the radio in sequence and testing each stage, teaches quite a bit)
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Re: Tracing receive signal for low signal
TP 16/17 should be "around " 12 mhz ...TP 13/14? 45 mhz ..TP 1/2 ...whatever the reciever is tuned to
you could use the 3rd harmonic of your SG at TP13/14 45/3=15mhz??? ..maybe
Jim
On Saturday, December 22, 2018, 10:13:22 PM PST, Dave Space <davesspacebar@...> wrote:
Ooops I think I didn't do it right for TP14 and 17.? My signal generator only goes to 25MHZ so couldn't do TP14.
I can retry tp 17.
I was testing at 7.150MHZ in general otherwise.
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Re: Tracing receive signal for low signal
Cool !! ...Put Signal Gen on CW-2 Pins ...measure there... Change freq +/- 100 khz or so ...Should be broadband at that point with scope indication varying showing AUDIO bandpass ...at that point, the SG is mixing with the BFO freq? ...
Jim
On Saturday, December 22, 2018, 9:54:37 PM PST, Dave Space <davesspacebar@...> wrote:
Took off the attenuator and measured
at tp 13 took 200mv to get to .1vp-p
tp14 took 1.4v to get to .1 vp-p
tp17 3.5v only got to 30mv p-p
tp16 3.5v only got to 50mv p-p
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Re: Low output on CW UBITX
Not to overlook the obvious.
Are you driving into a dummy load?
I have seen lots of variation with mis matched antennas.
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Re: My first Homebrewed radio: The DC40
Thanks for sharing it! Si and quality dds allow for building any conventional receivers (non ADC) with good characteristics. I far prefer using them than a brand rig for casual listening. My approach is building each stage in a box so I can swap different components (bandpass filters, mixers, IF filters, oscillators) and have a different receiver. Each stage is connected with BNC connectors as they are good and fast to connect. So I can build in minutes a receiver up to 2400Mhz. However the ubitx experience shows how much more complex is to have a clean SSB TX output. Making a good general coverage receiver is rather simple nowadays, a TX remains fairly complex to me and requires more testing for compliancy.
Il 23/dic/2018 09:33, "Ryan Flowers" < geocrasher@...> ha scritto: Hello everyone,
I've spent this month building Farhan's DC40 direct conversion receiver. I adapted it to use a si5351a VFO from QRP Labs, and it's also easy to make it multi-band. I have it set up on 20 and 40 meters currently. It's a *great* sounding receiver.
I documented the entire process with as much detail as I could, and I hope you'll check out the series. It took nearly as long to write as it did to build the radio :p?
It's a four part series, and the last installment was just published tonight. Be sure to check out the youtube video of the receiver in action as well as a list of all the things I did wrong (oops!).?
--
Ryan Flowers - W7RLF
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Re: Tracing receive signal for low signal
If your goal is to repair your radio, I would short circuit your signal tracing a moment and try to decide what else might be wrong. Does the display work correctly? Do you hear any signals on your antenna. Does the same antenna pick up signals well with your other radio.
I would look at the connectors. Particularly the 8 pin audio connector. at the front of the board. I have had connection issues with it. Can you flick that harness while listening and introduce microphony. Before I got my last radio working I had to remove the wire from each port on the connector and tighten them up. The V4 board does not have a strong audio.
If your goal is to learn how to use your signal tracer it might pay to start on something that is working.
73
Dave
k0mbt
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My first Homebrewed radio: The DC40
Hello everyone,
I've spent this month building Farhan's DC40 direct conversion receiver. I adapted it to use a si5351a VFO from QRP Labs, and it's also easy to make it multi-band. I have it set up on 20 and 40 meters currently. It's a *great* sounding receiver.
I documented the entire process with as much detail as I could, and I hope you'll check out the series. It took nearly as long to write as it did to build the radio :p?
It's a four part series, and the last installment was just published tonight. Be sure to check out the youtube video of the receiver in action as well as a list of all the things I did wrong (oops!).?
--
Ryan Flowers - W7RLF
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Re: Tracing receive signal for low signal
Same stage gains mentioned in dB found here on the homebrew UBITX receiver where I measured each 50 ohm block separately with a 50 ohm termination, except that I¡¯m using a 45 MHz LC filter with 3-4 dB loss. ?
But not having built anything until a couple years ago I¡¯m very sympathetic to trying to measure each stage correctly until you get good at using whatever tools you have, and how hard it is to measure the sub¡ª80 dBm levels. ?Having a standard like the old 3 band Elecraft 1 and 50 microvolt standard is a big time saver for deciding whether or ?not the system is good/not good.
You¡¯re getting a lot of good advice if you can do those measurements.
Good luck. Scott Ka9p Make something good happen!
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On Dec 22, 2018, at 11:01 PM, jim via Groups.Io < ab7vf@...> wrote: Frankly, I would not mind seeing other measurements ...at least to form SOME sort of baseline ...As I said ...Quick and dirty Don't like 'em ..delete 'em ....Measure your own and share There has been a whole LOT of theory/smoke and mirrors/hand-waving and just plain (imho) bs bandied about ....But DO provide some sort of REFERENCE ...Top o' audio pot was easy-peasy and very low bandwidth
Jim
On Saturday, December 22, 2018, 6:17:58 PM PST, Jerry Gaffke via Groups.Io < jgaffke@...> wrote:
Assuming your signal generator can correctly inject the levels shown in the chart, you should get rational results here regardless of the different frequencies. Namely,? ? Perhaps 1 or 2 dB loss through the LPF at L1,2,3,4 ? 6dB through the mixers ? Maybe 3 or 4 dB through the two crystal filters ? And around 10 or 12 dB through the 45mhz amp, 16dB through the 12mhz amp. I do like the way you went about the measurements though, looking only at the audio with the scope means just about any scope could be used there. Or perhaps a diode peak detector and a dc voltmeter. The signal generator could be an si5351 driving a step attenuator. Jerry On Sat, Dec 22, 2018 at 05:51 PM, jim wrote:
different frequencies ....
?
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thanks gilles
but i have decided to go for a gsx rig from qrplabs
terry
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Joel Caulkins/N6ALT
_Dave_ AD0B