Re: Homebrew from scratch
#ubitx
I would like to know whether? any other person is able to open these gerber files. If so can he /she help me with a 274X format files of the same.
Peter has already indicated that he would not respond for any message seeking help. Fine, and thanks.
regards sarma ?vu43zmv
On Sat, Dec 8, 2018 at 1:10 PM MVS Sarma via Groups.Io <mvssarma= [email protected]> wrote: Peter,
?Thanks for the new pcb artwork.
?For reasons, I have not been able to open your gerber files using a software "gerber Logix" or under sprint layout that has facility for inputting gerber files.
May I request you gerber files to 274X format please.
regards
sarma
vu3zmv
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Re: Homebrew from scratch
#ubitx
Peter,
?Thanks for the new pcb artwork.
?For reasons, I have not been able to open your gerber files using a software "gerber Logix" or under sprint layout that has facility for inputting gerber files.
May I request you gerber files to 274X format please.
regards
sarma
vu3zmv
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Re: Sound card interface swivhing
He has one sound card in a radio - presumably an SDR tcvr thingy and two computers.? ? You , D Balfour, ?? have solved another problem - nice try but no cigar.
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Re: Sound card interface swivhing
I have put in a dpdt switch in my ubitx. In one position it goes to the mic/speaker and the other position goes to the sound card. You couid put a dpdt switch between two sound cards on the radio side of things.
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Re: Sound card interface swivhing
I have used for switching between 2 Raspberry Pis.? Worked well.
Evan AC9TU
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Re: Sound card interface swivhing
I would use a USB switch.
Above is just an example.? I have not used that particular switch.
Evan AC9TU
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Re: Sound card interface swivhing
A web search for "USB Switch" finds this:
? ?
Lots of other hits, some cheaper.
I've never tried using one.
Jerry
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On Fri, Dec 7, 2018 at 11:27 AM, Art Olson wrote:
This is a bit off topic so please excuse my ask.?
Would like to switch internal radio sound card between 2 computers via usb-a and usb-b cable. Currently plugging and unplugging separate cables. Any suggestions appreciated
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Sound card interface swivhing
This is a bit off topic so please excuse my ask.?
Would like to switch internal radio sound card between 2 computers via usb-a and usb-b cable. Currently plugging and unplugging separate cables. Any suggestions appreciated
73
Art N2AJO?
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Re: UBITX Current Production (spur fix ?)
#ubitx
Evan, ? You might want to check out my uBITX build on QRZ. ? ? Many of the modifications discussed on this site have been implemented during the build including those to improve harmonic and spurious signal suppression. There are lots of pictures and SA screen shots before and after the modifications were done. ? Ripley ? Sent from for Windows 10 ?
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From: Curt via Groups.IoSent: Friday, December 7, 2018 12:56 PM To: [email protected]Subject: Re: [BITX20] UBITX Current Production (spur fix ?) #ubitx ? Evan
wait seems like a good approach.? the mods we are doing do not require any holes or cuts into the board, but I imagine you meant it figuratively.? I have the parts and daughter board for the added relays, but have not started the repair.? the board we are using was designed by someone else who provided artwork, and we ordered enough of them for our group build (so possibly someone here knows it - a clue is that we replace the input side of the switched filter function).? then someone bought the needed parts from a single supplier.? when we have enough successful verification I will encourage our team to post the info.? to me it seems a nice approach for the world-wide community to use as it is arranged for ease of installation with simple tools and skills.? we have a spectrum analyzer available - but I get it, a desirable fix will be reproducible with confidence as few amateurs around the world have such equipment.? I did not see your email on qrz yet -- you are welcome to email me to gather further data when I have it.? Meanwhile enjoy your ubitx in the lower spectrum, not through a power amp.?
Curt
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Hi
I just bought a ubitx board.? Hasn't arrived yet.? Is this mod still needed on the current boards shipping?
Is there a schematic or closer zoom in for where the parts go across for both fixes??
Even zoomed in on the photo having a little trouble making out where the connections are.
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Re: UBITX Current Production (spur fix ?)
#ubitx
Evan
wait seems like a good approach.? the mods we are doing do not require any holes or cuts into the board, but I imagine you meant it figuratively.? I have the parts and daughter board for the added relays, but have not started the repair.? the board we are using was designed by someone else who provided artwork, and we ordered enough of them for our group build (so possibly someone here knows it - a clue is that we replace the input side of the switched filter function).? then someone bought the needed parts from a single supplier.? when we have enough successful verification I will encourage our team to post the info.? to me it seems a nice approach for the world-wide community to use as it is arranged for ease of installation with simple tools and skills.? we have a spectrum analyzer available - but I get it, a desirable fix will be reproducible with confidence as few amateurs around the world have such equipment.? I did not see your email on qrz yet -- you are welcome to email me to gather further data when I have it.? Meanwhile enjoy your ubitx in the lower spectrum, not through a power amp.?
Curt
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Re: Added characters while using the keyer function
#ubitx
Hi, ???????? I placed a 5k1 resistor in each cw wiring line to the cw socket and do not get any extra charactors and get what i send,,,.It works for me and has done for 12 months.I use a bencher paddle key and 20 wpm and use my bitx most days on various bands plus i have 2 other ubitx transceivers which run KD8 CEC firmware,I am impressed with all 3..Regards? Dave G0AYD..
I have a V3 ubitx given to me and I have added a jack for an imabic keyer.? Seems to work but I am finding that it will sometimes send dah dit dit dit dah when I send the letter C.? Just a bit disconcerting. The contacts on the key have been cleaned but I? am still getting an occassional missed character when I send.? I am running KD8CEC firmware on the nano with Iambic B setting in Ian's program.? This of course does not happen when using a straight key but then there are other issues there as well.??
Thanks in advance
John AC8JW
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Re: UBITX Current Production (spur fix ?)
#ubitx
Curt,
Good to hear about your plans.? Would you be so kind as to list the mods/updates you are making in your group build?? I am still waiting for feedback on the mods that are needed before I cut into my board.
73 Evan AC9TU
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Re: UBITX Current Production (spur fix ?)
#ubitx
Mark
as you wish.? we have a world-wide community to work out the shortcomings.? in my area we are doing a group build of 23 rigs - at least one prototype has been fully cured and each builder is in the process of build and making the small changes.? flaws are less on the lower bands - we are confident that we will be compliant.? I anticipate sufficient direction and merchants to emerge, hopefully, to kit the parts.? its a nice rig to experience, not a bad thing that we need to make some updates.?
73 Curt
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dear OM - I am understanding you have a ubitx - welcome to the worldwide community.? be careful and patient, and enjoy assembly.?
73 curt wb8yyy
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Re: Is push pull hf amp has higher spectral purity
Brian,
They were all busy looking at the harmonics, didn't think to check for that close in spur.
Would be interesting to see how strong it is on other rigs.
I believe the strength of the spur comes down to how strong that 4'th harmonic of the VFO is.
During transmit, the VFO mixes in after the signal passes through the crystal filter,
so a lousy crystal filter is not contributing to the spur.
Lesson learned:? Use high side local oscillators wherever possible.
Jerry
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On Thu, Dec 6, 2018 at 02:56 PM, Brian wrote:
From memory, I measured the spur to be 35dB down on the 7.15MHz signal. Nobody else reported measuring it which surprised me since quite a bit was written about modding the LPF to meet fcc on harmonics.
The 12MHz xtal filter in my rig was very bad on the LF side, perhaps one xtal is slightly off frequency. I did consider building a new 12MHz filter but never got around to it. I have several home built filters at 8.86MHz but they are just a bit too big to fit in.
I decided to leave it as is and only use USB with digital.
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Re: Is push pull hf amp has higher spectral purity
From memory, I measured the spur to be 35dB down on the 7.15MHz signal. Nobody else reported measuring it which surprised me since quite a bit was written about modding the LPF to meet fcc on harmonics.
The 12MHz xtal filter in my rig was very bad on the LF side, perhaps one xtal is slightly off frequency. I did consider building a new 12MHz filter but never got around to it. I have several home built filters at 8.86MHz but they are just a bit too big to fit in.
I decided to leave it as is and only use USB with digital.
Brian.
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Re: [Joe] Bare Board Image
Glad to be of service. ? Ripley ? Sent from for Windows 10 ?
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From: WoodySent: Thursday, December 6, 2018 5:45 PM To: [email protected]Subject: Re: [BITX20] [Joe] Bare Board Image ? Hi Ripley, ? Thanks!? Exactly what / where I thought.? Appreciate the confirmation. ? Woody ? ? On 12/6/2018 22:31, Ripley wrote: >? > Hello Woody, >? > Maybe you will find this link to my uBITX build on QRZ helpful. There > are a lot of pictures showing the implementation of a RF gain control > and AGC circuit. >? > https://forums.qrz.com/index.php?threads/ubitx-transceiver-semi-kit-build.624098/page-3 >? > There are also details pertaining to the harmonics mod with the relay > replacement, 45MHz crystal filter ETC¡ ?with before and after > snapshots from my spectrum analyzer. >? > Have fun >? > Ripley >? > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 >? > *From: *Woody <mailto:mailme@...> > *Sent: *Thursday, December 6, 2018 4:52 PM > *To: *[email protected] <mailto:[email protected]> > *Subject: *Re: [BITX20] [Joe] Bare Board Image >? > OK on all... > What I really need is confirmation of a trace location to install an > Attenuator / Amplifier I am working on.? Can't see under the relay ;) > This is the trace I think I am looking for...? TNX, Woody >? >? > _ >? ? ? -- ? ? ? ?
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Re: [Joe] Bare Board Image
Hi Ripley, Thanks!? Exactly what / where I thought.? Appreciate the confirmation. Woody On 12/6/2018 22:31, Ripley wrote:
Hello Woody,
Maybe you will find this link to my uBITX build on QRZ helpful. There are a lot of pictures showing the implementation of a RF gain control and AGC circuit.
There are also details pertaining to the harmonics mod with the relay replacement, 45MHz crystal filter ETC¡ ?with before and after snapshots from my spectrum analyzer.
Have fun
Ripley
Sent from Mail <> for Windows 10
*From: *Woody <mailto:mailme@...>
*Sent: *Thursday, December 6, 2018 4:52 PM
*To: *[email protected] <mailto:[email protected]>
*Subject: *Re: [BITX20] [Joe] Bare Board Image
OK on all...
What I really need is confirmation of a trace location to install an Attenuator / Amplifier I am working on.? Can't see under the relay ;)
This is the trace I think I am looking for...? TNX, Woody
_
--
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Re: [Joe] Bare Board Image
Hello Woody, ? Maybe you will find this link to my uBITX build on QRZ helpful. There are a lot of pictures showing the implementation of a RF gain control and AGC circuit. ? ? There are also details pertaining to the harmonics mod with the relay replacement, 45MHz crystal filter ETC¡ ?with before and after snapshots from my spectrum analyzer. ? Have fun ? Ripley ? Sent from for Windows 10 ?
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From: WoodySent: Thursday, December 6, 2018 4:52 PM To: [email protected]Subject: Re: [BITX20] [Joe] Bare Board Image ? OK on all...
What I really need is confirmation of a trace location to install an Attenuator / Amplifier I am working on.? Can't see under the relay ;)
This is the trace I think I am looking for...? TNX, Woody
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_Dave_ AD0B
Ripley
