No Problem, it happens a lot and I am use to it.
73 Evan
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You all have seen those computer headsets like the VTIN with boom microphone. Does anyone know what kind of microphone those use.Eg. condenser , dynamic etc. If I open my junk drawer I may use it on the Ubitx.
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Re: My first Homebrewed radio: The DC40
How embarrassing! I managed to make one different. Thanks for catching it!?
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Ryan Flowers - W7RLF
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Re: Tracing receive signal for low signal
Injected 1.52v 1khz sine wave at base of q70 to get 0.1v p-p
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Re: Tracing receive signal for low signal
Thanks interesting.
TP 17 using third harmonic of 45+7.150 / 3 found a tone injecting around 17.59MHZ at 3.5v only got about 58mv p-p out at volume high
TP 16 injecting at the same frequency 3.5v got about 69mv p-p
At CW injecting at 7.150 3.5v got me 40mv p-p
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Actually the 20m at this season, at th at this local time is rather closed here. The 40m band is now best for dx. However today I would use a codan trx, not a qrp. If any one in interested in a ubitx-codan QSO I can operate from 7050 to 7200
Il 23/dic/2018 21:27, "d balfour" < davesters@...> ha scritto: Unlikely to skip that far on 40 these days . Maybe on 20 meters. I have made Euro contacts ssb with my rig on 20. If you want to to try a qso on 20 let me know.
Thank you
Dave
K0MBT
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Unlikely to skip that far on 40 these days . Maybe on 20 meters. I have made Euro contacts ssb with my rig on 20. If you want to to try a qso on 20 let me know.
Thank you
Dave
K0MBT
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Re: My first Homebrewed radio: The DC40
Thank you Ryan. It looks like an excellent series. The link you posted is not working. This one is good: parts 2 through 4 are here:
It seems that the part 1 URL doesn't have an 'a' between building and direct. Anyway, I'm going to go and read your articles. Thanks for sharing!
Regards, Ken, KM4NFQ "Not Fully Qualified"
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!).?
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Ryan Flowers - W7RLF
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Is anyone monitoring 7.277?
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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
toggle quoted message
Show quoted text
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.
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Jon Titus, KZ1G
Herriman, UT USA
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_Dave_ AD0B
Joel Caulkins/N6ALT