Re: Quick review of the Kit-Projects AGC board
#ubitx
Simon, We ship to VK land for 14.50$
Jim, Thanks for the review. We are still working on the install instructions but wanted to keep them clear and short so I hope we did that.
Credit should also go to Tim, KE2GKB for board layout.
73
--
David
?N8DAH
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Re: My uBitx Easy-Digi interface for under $20
Allen, thank you very much for taking the time to put this together. It's the very thing I need to help and old fart like me understand how to get into "Digi"! Know I just need to figure out if I can use the native audio and mic ports on my laptop it if I have to get and use a USB soundcard dongle with this.
Roy WA0YMH
If anyone is interested, I have put together a google doc that shows part sources I used for my PC to uBitx "Easy Digi" interface, and the document includes a few tips.? It works and looks good, and I made my first PSK31 using fldigi from here in Ohio to New Mexico last Sunday night.? Works great, all for under $20, including cables.
Allen
KC8VRI
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Re: My uBitx Easy-Digi interface for under $20
Nice job, thanks for sharing
I was fortunate to have a Signalink USB I had been using for my very
old Yaesu so I have been using that.
Good stuff
73
Laurence , KB1HKO
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On Tue, Mar 19, 2019 at 11:45 AM <howellubeen@...> wrote:
If anyone is interested, I have put together a google doc that shows part sources I used for my PC to uBitx "Easy Digi" interface, and the document includes a few tips. It works and looks good, and I made my first PSK31 using fldigi from here in Ohio to New Mexico last Sunday night. Works great, all for under $20, including cables.
Allen
KC8VRI
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Re: My measurements for L5/L7 & Relay Mods
Spur reduction........ for you guys set up to make measurements.
My earlier suggestion to try regular toroids (but smaller ones like T20-6 with #30 wire) didn't gain any traction.?
How about this "easy to try".....#1) fold Y1 over against the board? ?#2) move the existing toroids (L5/L7) to the back and lay them flat against the board.?
73 Kees K5BCQ
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My uBitx Easy-Digi interface for under $20
If anyone is interested, I have put together a google doc that shows part sources I used for my PC to uBitx "Easy Digi" interface, and the document includes a few tips.? It works and looks good, and I made my first PSK31 using fldigi from here in Ohio to New Mexico last Sunday night.? Works great, all for under $20, including cables.
https://docs.google.com/document/d/1JUxKDvOQzJ4ja1zwS6CGjcqXBUi8U1jlZPhJaSRtLTs/edit?usp=sharing
Allen
KC8VRI
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Re: Quick review of the Kit-Projects AGC board
#ubitx
Look up N8DAH on QRZ and email him.? His email address is listed there.? As he is the main guy in Kit-Projects.com hopefully he will respond with that information.
W0EB
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Mark, I think you are spot-on. I used these inductors from the same Ebay seller and made the mod that Raj suggested. I tested my unmodified V3 board, then did the mod and compared the spurs using an SA. I saw no difference with the mod in place. I would like to see the results from some other's testing to see if it is just me or if these are just not appropriate parts for this mod.
The datasheet does not show that these are shielded inductors (epcos B82422A1681K). Looks like I'll search for some shielded inductors and try again.
Mike M. KU4QO
On Mon, Mar 18, 2019 at 7:00 PM Mark - N7EKU < n7eku@...> wrote: Hmm,
The ebay seller may say they are, but the Epcos datasheet doesn't say that.? It states that it is wire wound on a ceramic core.? The only shielded one I saw in the series was the ones for power supplies made with a cup core.
Anyway, I wonder if shielding has much to do with any improvement.? More likely due to the small size, installed orientation, or low Q factor.? It could easily be checked by cutting one apart though.?
How many confirmed measurements on different boards (before and after with no other changes using an SA) have been shown for this change??
73,
Mark.
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Re: My measurements for L5/L7 & Relay Mods
I must repeat that C211 was bypassed just to conveniently solder the
inductors.
211/215 both do not change any filter. properties.
Here is a pic of my mod on vu2pop's board!
Raj
At 19-03-19, you wrote:
I uploaded a spreadsheet of my
measurements for my ubitx for 80,40,30,20, and 10m:
?? 1. Stock
?? 2. Replaced L5/L7 with SMD inductors I found locally, kept C211
in circuit
?? 3. Replaced the relays
?? 4. Replaced the inductors with the specified Murata parts
?? 5. Bypassed C211 per the mod
The mods I used:??
Both helped.
To desolder the relays, I used a piece of desoldering stick,
a low temp alloy along with solder wick and a hot
tip on the iron, made easy work of it.?? Cleanup was the worst
bit.
Probably about the same as:
I'll probably put the cap back in the circuit to get 30m.
I still need to find a solution for 80m.\
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Re: Quick review of the Kit-Projects AGC board
#ubitx
Anyone know what the dx postage to vk might be for these?
Regards?
Simon?
VK3ELH?
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Re: My measurements for L5/L7 & Relay Mods
The harmonic at 30MHz went from 46 dB
separation down to 41.49
when I removed the capacitor from the circuit.? I'm not trying to
analyze
at this point, just being mechanical about it...
-j
On 3/19/2019 12:49 AM, Kelly Jack wrote:
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What does the cap do for 30m?
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Re: My measurements for L5/L7 & Relay Mods
What does the cap do for 30m?
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Re: My measurements for L5/L7 & Relay Mods
Please check in SSB mode.
Raj
At 19-03-19, you wrote:
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Yes, this was done in CW
mode.
? ? ?? 12V LiPo Battery pack??
()
? ? ?? 40dB homebrew attenuator which I've characterized as being
pretty flat
? ? ?? Agilent E4404B SA & HP 8595E SA depending on which one I
could use at the time
? ? ?? 3D printed key
? ? ?? Misc cables...
This is a v3 radio.?? Right now it's mounted in the plastic box it
came in until it decides
what it wants to be when it grows up :-)? ?? I have a JackAl board
ready to go when I'm
happy with the harmonics.
No idea about the power.? ? ?? Next time I make a change I'll try a
few different cables, jiggle things, etc...
Is there a good way to characterize with SSB?
I was excited to see the ARRL testing book, but very disappointed by the
reviews.
John
W1JDS
On 3/18/2019 10:51 PM, John (vk2eta) wrote:
Hello John,
Great and useful data.
Based on the harmonic frequencies and levels I concluded this was done in
CW mode.
Is this correct? If not, how was the test done.
I also notice the power values of the fundamental varies quite a bit
between tests for the same band. Can you shed some lights as to
why?
73, John
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Re: Interesting article contrasting different ways to design an antenna analyzer
I try to respond to my question. It shows the Smith Chart but it puts the trajectory on the upper half of the plane.
Il 18/mar/2019 12:17, "iz oos" < and2oosiz2@...> ha scritto: I had a look. It points out, among other things and if I understood it right, that many analyzers cannot give the sign of reactance. The Mini60 (Sark100) would be among them. But how can it display the graphics of the Smith Charts on the PC then?
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Re: My measurements for L5/L7 & Relay Mods
Thanks for the test conditions.?
Regarding SSB testing it seems that 7 to 10watts out at 40m with a 50mv peak to peak Mic input (as per Jerry KE7ER posts) is a reasonable base.
You should then see spurs below the fundamental especially above 14mhz.
73, John
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Hi Barry,? the link you posted takes you somewhere else
Dan's small parts link
Regards Lawrence
On Tue, Mar 19, 2019 at 5:24 AM barry halterman < kthreebo@...> wrote: Check out Dan's kits and for these 2N2222's in metal cans. He did have some JAN (military grade) available.
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Re: My measurements for L5/L7 & Relay Mods
Yes, this was done in CW mode.
??? 12V LiPo Battery pack? ()
??? 40dB homebrew attenuator which I've characterized as being
pretty flat
??? Agilent E4404B SA & HP 8595E SA depending on which one I
could use at the time
??? 3D printed key
??? Misc cables...
This is a v3 radio.? Right now it's mounted in the plastic box it
came in until it decides
what it wants to be when it grows up :-)?? I have a JackAl board
ready to go when I'm
happy with the harmonics.
No idea about the power.??? Next time I make a change I'll try a
few different cables, jiggle things, etc...
Is there a good way to characterize with SSB?
I was excited to see the ARRL testing book, but very disappointed
by the reviews.
John
W1JDS
On 3/18/2019 10:51 PM, John (vk2eta) wrote:
toggle quoted message
Show quoted text
Hello John,
Great and useful data.
Based on the harmonic frequencies and levels I concluded this was
done in CW mode.
Is this correct? If not, how was the test done.
I also notice the power values of the fundamental varies quite a
bit between tests for the same band. Can you shed some lights as
to why?
73, John
|
Re: My measurements for L5/L7 & Relay Mods
Hello John,
Great and useful data.
Based on the harmonic frequencies and levels I concluded this was done in CW mode.
Is this correct? If not, how was the test done.
I also notice the power values of the fundamental varies quite a bit between tests for the same band. Can you shed some lights as to why?
73, John
|
My measurements for L5/L7 & Relay Mods
I uploaded a spreadsheet of my measurements for my ubitx for 80,40,30,20, and 10m:
? 1. Stock
? 2. Replaced L5/L7 with SMD inductors I found locally, kept C211 in circuit
? 3. Replaced the relays
? 4. Replaced the inductors with the specified Murata parts
? 5. Bypassed C211 per the mod
The mods I used:?
Both helped.
To desolder the relays, I used a piece of desoldering stick,
a low temp alloy along with solder wick and a hot
tip on the iron, made easy work of it.? Cleanup was the worst bit.
Probably about the same as:
I'll probably put the cap back in the circuit to get 30m.
I still need to find a solution for 80m.
|
Check out Dan's kits and parts.com for these 2N2222's in metal cans. He did have some JAN (military grade) available.
|
N8DAH
Jim Sheldon
Raj vu2zap