Carl, I would think so.? ??#58782One VDDO pad per clock out should be much better than 3 clocks sharing the same power pad. Also the?QFN? package has a much better GND solution.? But it comes down to what is the cost effective required improvement. Rgds, Gary
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RCboatguy,
The problem may not be the supply line but the ground line and even if there are more?
its still current flowing on internal ground buses and the bulk silicon.
The only way to know is test.
Allison
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I am wondering if we could use the 8-output version of the Si5351 instead of the 3-output version to reduce the cross-talk.? The 8-output version has separate Vddox inputs per pair of clock outputs instead of sharing 1 Vddo supply pin across all three outputs.? If we used only used 1 output from 3 of the 4 pairs, we'd at least separate the supplies for each output we use, and each supply pin can have its own decoupling cap.
73,
Carl,? K0MWC
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
AVAILABLE AGAIN!
Found the package of boards sitting on a neighbor's doorstep.? Hooray!? ?Managed to get the listing re-activated (eBay isn't that easy to figure out....but I got it).??
?I found I can mail either 1 or 2 in a first class envelope to anywhere that the United States Postal Service can mail -- now that I know what they charged me, I can sell in groups of 1 or 2 boards, and will endeavor to put $1 refund in any orders of 2.?
?
Again, the GERBERS are freely available so if you wish to take on this project for a club or group, you can simply order 10 boards for about $20 (including shipping) directly from pcbway.com yourself and save quite a bit of $$.? ?I'm just providing these
onesies and twosies for the folks who cant/don't want to order pcbs themselves.? (e.g., if you order 4 boards, I'll ship as two envelopes of two boards each to make sure I stay on the good side of the USPS, as a non-machineable first class envelope of minimal
thickness)
With all the fixes for the SPURS being developed and tested by Warren, Raj, and so many others....wow!? y'all are giving great ideas to the manufacturer and this product will become even better with all the suggestions y'all and Allison and others have been
making.? ?The ham community will benefit from all the volunteer wisdom being donated.
Cheers,
gordon kx4z
toggle quoted message
Show quoted text
From: Gibby,Gordon L
Sent: Monday, September 10, 2018 9:38 PM
To: [email protected]
Subject: Re: [BITX20] Right-sided relay harmonic attempted fix for v3/4 ubitx
?
Well, we have an unexpected setback.
The powers that be in my neighborhood concluded that our mailboxes were not uniform enough, so they spent our money and pulled up all of our existing mailboxes and put new ones in, .....without any house numbers. ? Things have to be done just so are they
aren¡¯t happy, so none of us have even touched the new $500 mailboxes.?
Not realizing that risk, I signed for DHL to deliver the $50 worth of printed circuit boards from?
China without a signature, since I was expecting to be at work....no way to sign for them.?
They were delivered all right, and even a day earlier than expected ¡ªbut nobody knows where!! ?About 230 this afternoon, somebody got the package (based on the tracking information). ?I have emailed everyone in my homeowners association hoping someone
found the package.....
If not, I guess I am out the $50 and will decide whether to re-order the order again.
Such. Is. Life. ?
One step forward, two steps back?
Gordon.?
Hello Gordon,
Good to hear. I am looking forward to purchasing a few.
Ripley
The words are mine but this iPad does what it will with them.
On Sep 9, 2018, at 4:58 PM, Gordon Gibby < ggibby@...> wrote:
Hi folks....
25 new blank boards for the simple-minded right-sided relay board fix are supposed to arrive from China on Tuesday.? ?If so, I'll re-enable? the Ebay advertisement and up the "count" (a learning experience) on Wednesday.? ?Was able to mail out five boards on
Friday before leaving on a camping trip.? ?Hope they arrive OK!!!? ?I figured out how to mark them as "shipped" and send a note to each purchaser through Ebay.? ?With all the SPUR FIXES now being discovered, things are really shaping up around this little
transceiver to make it have much fewer spurious responses.? ?Delighted to see the group progress.? ?Each person proceeds at? their own pace, but the group moves forward huge amounts.
Cheers,
gordon KX4Z
|
Raj
The green display line is set at -43 dBc for a 33 dBm carrier level. None of the harmonics comes close to that level. The harmonics are higher than I would like but certainly acceptable. The test filters I used are not as good as the LPF supplied with the radio, once they are removed from the uBitx board. I am working to test a third party four filter board that will allow the uBitx filters to be transplanted to it. That will bring even these harmonics much lower.
WA8TOD
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>>Did you buffer all three outputs in your test?? And measure the buffered one only or all three?
All three with the 74AUP wich are one inverter per package.
>>I don't have access to 74LVT04 but used 3 x 74LVC04's (SOT single versions)
I didn't try the hex inverter part (6 inverters per package).? I suspect that needs testing?
as you run into the same issues of common busses on the die for power.? So that part
could (untested) also have cross talk.
Of course with fast rise/fall time transistions the layout should look like VHF/UHF
ground planes and top pour of ground copper.??Bypassing is also important and
watch for ground loops.
Allison
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|
|
My LPF boards are in, I'll post them to testers asap. I'll also order some 45mhz filter boards too...
73 Nick VK4PP
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Hi Raj As requested. Conditions: - 30 mVrms 1 KHz audio input - Power Out set to nominal +31 dBm which reads as 2 watts on my meter; set with RV1 - On board filter bypassed; external LPFs used as shown WA8TOD    
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Re: [BITX40] Replacement Raduino Board
perhaps you can replace either, arduino nano, interface if any to si5351 or si5351 itself. ?please see some videos. it is easy .
?with little effort you may also be able to load the firmware.
?If you want to change there are at least 4 types with our great members.
All the best regards sarma ?vu3zmv
On Tue, Sep 11, 2018 at 12:12 PM John Baines via Groups.Io <jbaines= [email protected]> wrote: Hi all,
Can anyone tell me how to obtain a replacement raduino board for my BitX40?
73
John
M0JBA
|
[BITX40] Replacement Raduino Board
Hi all,
Can anyone tell me how to obtain a replacement raduino board for my BitX40?
73
John
M0JBA
|
Warren,
Please share your spurs at 3.6, 7.2 and 14.2 with the same 100Mhz span.
Want to compare with mine.
Raj
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Show quoted text
At 10-09-18, you wrote: My implementation of the filter with a single transformer. I encapsulated the transformer and the filter with heat shrink and mounted it as a single component. As before the power levels are standardized to approximately 2 watts for easy comparison.
|
Allison, I would be interested in further info on your checks with the Buffer. Did you buffer all three outputs in your test?? And measure the buffered one only or all three? I don't have access to 74LVT04 but used 3 x 74LVC04's (SOT single versions) I have one Si5351 board with the buffers and a standard one to compare with. (Adafruit) I didn't see the big reduction in cross-talk levels. To the contrary.? I do get a very worthwhile output level improvement at the desired frequency per port, in the order of? plus 13-14dBm. Up from about +8. Pic shows the 12MHz output for example on SA, with and without buffers. The other outputs show a similar, worse, result. As you suggest though further BPF's? to each output would be desirable in any case. I'm wondering if the LVC parts are OK and also, if each buffer chip maybe, should be fed through its own L/C filter on the 3v3 lines. There may be cross-talk across the LVC04 supply lines, just like the Si5351. I do have a couple of 100nF on the supply. Set-up:- The SA is fed via a 30dB attenuator and the SA is adjusted for an offset of 30db to show the actual dBm levels on screen.  Shielding costs weight and money is no surprise, it also gets good results!? Using the 5351 as a single oscillator is actually not bad it when you try to use it for but LO and CIO the fun begins.? Solution use a buffer that presents a high impedance to the 5351.? Lower the circulating current at the outputs and the undesired cross-talk goes down. Band pass filter can limit the impact of this but buffering first really helps.? I tried a 74LVT04 and the spur was near gone (down in the HP8568B SA noise).? Simple fix as those are available as one inverter per sot package.? They are cheap too Mouser gets 37 cents for them for qant=1. So buffer then band pass you get even better result. Me I cut my teeth doing superhet radios starting in the late 60s and the first thing to overcome was unstable VFOs.? By time I started college I'd developed a deep understanding of PLL systems and had made one for a radio using TTL/CMOS and whatever was available in 1971.? So many issues of synthesized RF sources are seriously old hat. What shocked me is after doing research and experiments I looked at many designs and noted very few people understood this or paid attention to it.? Interesting thing is the only ones that? do not have issues either use the Sa612 (high input impedance) and the QSD mixers (cmos switch). Allison
On Fri, Sep 7, 2018 at 02:33 AM, ajparent1/KB1GMX wrote:
Shielding costs weight and money is no surprise, it also gets good results!? Using the 5351 as a single
oscillator is actually not bad it when you try to use it for but LO and CIO the fun begins.? Solution use
a buffer that presents a high impedance to the 5351.? Lower the circulating current at the outputs and
the undesired cross-talk goes down.
Band pass filter can limit the impact of this but buffering first really helps.? I tried a 74LVT04 and the
spur was near gone (down in the HP8568B SA noise).? Simple fix as those are available as one
inverter per sot package.? They are cheap too Mouser gets 37 cents for them for qant=1.
So buffer then band pass you get even better result.
Me I cut my teeth doing superhet radios starting in the late 60s and the first thing to overcome was
unstable VFOs.? By time I started college I'd developed a deep understanding of PLL systems and
had made one for a radio using TTL/CMOS and whatever was available in 1971.? So many issues
of synthesized RF sources are seriously old hat.
What shocked me is after doing research and experiments I looked at many designs and noted
very few people understood this or paid attention to it.? Interesting thing is the only ones that?
do not have issues either use the Sa612 (high input impedance) and the QSD mixers (cmos switch).
Allison
|
Re: Surprised by generous and kind act
#bitx40
Please post a picture of it, we¡¯d love to see it.?
Joe kd2nfc
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On Sep 9, 2018, at 12:15 AM, Robert D. Bowers < n4fbz@...> wrote:
Today I was greatly and pleasantly surprised.? I'd mentioned that I was thinking about converting my BITX20 to 40 meters, and I'd related some stories of frustration with the local ham community (generosity and willingness to help others seems to be a rarity in this area).
When I got our mail, there was a package in it - with a BITX40!? The housing it was in is very attractive as far as my wife and I are concerned - and perfect for our car.? The neat part was that you could see the circuitry in it - and the case also would lend itself to portable operation!
I won't embarrass the sender, but I will say it came from another state.? For many years, I've insisted that there was no such thing as Karma... but this suggests otherwise!
To the sender (not named) - a big Thank you! from both of us, and (laugh) no worry about "paying forward" - we do things all the time like that, whenever we can (we may not have much money, but we do have skills and knowledge we share).? Generosity and helping others is not a big price for gifts like this - in our opinion!
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Well that is unfortunate. I am sure they will show up eventually but ¡°eventually¡± can be a pretty big window of time. ? Ripley KD8UYQ ? Sent from for Windows 10 ?
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From: Gordon GibbySent: Monday, September 10, 2018 9:38 PM To: [email protected]Subject: Re: [BITX20] Right-sided relay harmonic attempted fix for v3/4 ubitx ? Well, we have an unexpected setback. The powers that be in my neighborhood concluded that our mailboxes were not uniform enough, so they spent our money and pulled up all of our existing mailboxes and put new ones in, .....without any house numbers. ? Things have to be done just so are they aren¡¯t happy, so none of us have even touched the new $500 mailboxes.? Not realizing that risk, I signed for DHL to deliver the $50 worth of printed circuit boards from? China without a signature, since I was expecting to be at work....no way to sign for them.? They were delivered all right, and even a day earlier than expected ¡ªbut nobody knows where!! ?About 230 this afternoon, somebody got the package (based on the tracking information). ?I have emailed everyone in my homeowners association hoping someone found the package..... If not, I guess I am out the $50 and will decide whether to re-order the order again. One step forward, two steps back? Hello Gordon, Good to hear. I am looking forward to purchasing a few. Ripley The words are mine but this iPad does what it will with them.
On Sep 9, 2018, at 4:58 PM, Gordon Gibby <ggibby@...> wrote:
Hi folks....
25 new blank boards for the simple-minded right-sided relay board fix are supposed to arrive from China on Tuesday.? ?If so, I'll re-enable? the Ebay advertisement and up the "count" (a learning experience) on Wednesday.? ?Was able to mail out five boards on Friday before leaving on a camping trip.? ?Hope they arrive OK!!!? ?I figured out how to mark them as "shipped" and send a note to each purchaser through Ebay.? ?With all the SPUR FIXES now being discovered, things are really shaping up around this little transceiver to make it have much fewer spurious responses.? ?Delighted to see the group progress.? ?Each person proceeds at? their own pace, but the group moves forward huge amounts.
Cheers,
gordon KX4Z
|
Hello Nick, ? Well they look dandy to me. Please let me (us) know when you start producing them. In the meanwhile I ordered on of Glen¡¯s boards to start playing with. ? Ripley ? Sent from for Windows 10 ?
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From: Nick VK4PPSent: Monday, September 10, 2018 9:10 PM To: [email protected]Subject: Re: [BITX20] Simple spur fix ? Thanks Ripley.
I havenet made any yet, just waiting on the final verdict as to whether it is good or not...
more pics.
Idea is to drill a GND hole just above the R27 printing. then the board sits flat/vertical and you solder from behind to the R27 pads. and a short leg on the front side for ground to the bottom of the board.
73 Nick Vk4PP
|
Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Well, we have an unexpected setback.
The powers that be in my neighborhood concluded that our mailboxes were not uniform enough, so they spent our money and pulled up all of our existing mailboxes and put new ones in, .....without any house numbers. ? Things have to be done just so are they
aren¡¯t happy, so none of us have even touched the new $500 mailboxes.?
Not realizing that risk, I signed for DHL to deliver the $50 worth of printed circuit boards from?
China without a signature, since I was expecting to be at work....no way to sign for them.?
They were delivered all right, and even a day earlier than expected ¡ªbut nobody knows where!! ?About 230 this afternoon, somebody got the package (based on the tracking information). ?I have emailed everyone in my homeowners association hoping someone
found the package.....
If not, I guess I am out the $50 and will decide whether to re-order the order again.
Such. Is. Life. ?
One step forward, two steps back?
Gordon.?
toggle quoted message
Show quoted text
Hello Gordon,
Good to hear. I am looking forward to purchasing a few.
Ripley
The words are mine but this iPad does what it will with them.
On Sep 9, 2018, at 4:58 PM, Gordon Gibby < ggibby@...> wrote:
Hi folks....
25 new blank boards for the simple-minded right-sided relay board fix are supposed to arrive from China on Tuesday.? ?If so, I'll re-enable? the Ebay advertisement and up the "count" (a learning experience) on Wednesday.? ?Was able to mail out five boards on
Friday before leaving on a camping trip.? ?Hope they arrive OK!!!? ?I figured out how to mark them as "shipped" and send a note to each purchaser through Ebay.? ?With all the SPUR FIXES now being discovered, things are really shaping up around this little
transceiver to make it have much fewer spurious responses.? ?Delighted to see the group progress.? ?Each person proceeds at? their own pace, but the group moves forward huge amounts.
Cheers,
gordon KX4Z
|
Thanks Ripley. I havenet made any yet, just waiting on the final verdict as to whether it is good or not... more pics. Idea is to drill a GND hole just above the R27 printing. then the board sits flat/vertical and you solder from behind to the R27 pads. and a short leg on the front side for ground to the bottom of the board.   73 Nick Vk4PP
|
Hashtags and Integrations
|
Hi Vince,
I bet with the key up is still goes to zero accurately. SWR is a RATIO so about half of whatever maximum deflection shows is still 3:1. And less is still less.
73,
Bill KU8H
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On 09/10/2018 02:59 PM, Vince Vielhaber wrote: Right, well this firebird isn't even usable as an swr meter unless you
put about a kilowatt into it. In the FWD, the meter won't go full scale
below about 14 MHz.
Vince.
On 09/10/2018 07:41 AM, iz oos wrote:
I have a cheap CB swr meter (just swr not power meter) and a crossneedle
ham-meter. In the instruction sheet they say it is usable between
1.8-30! They are liers!!!! It works from 1.8 to 50Mhz (yes up to the
6meters band) !!! Very similar reading to the ham meter!!! What a
shame... They don't even know what they sell... hihi... hi
Il 10/set/2018 07:40, "Vince Vielhaber" <vev@...
<mailto:vev@...>> ha scritto:
SWR and Wattmeters made for CB are often worthless in the ham bands,
unless you're only using 10M. I picked up a Firebird SWR/Wattmeter
a while back that was supposed to be good for 1.8-30 MHz. HAR!
That thing won't even read accurately (or even semi-accurately) at
21 MHz and gets progressively worse the lower you go. It barely
responds with almost 1KW going into it at 3.9MHz. Needless to say
it's going back on ebay. It is fairly accurate on 10 meters, so it
probably is on 11 too.
Vince.
On 09/09/2018 03:13 PM, Gordon Gibby wrote:
The only cb ones I have tried on 2 m are the long parallel rod
pick up type, they were quite in accurate
For VHF/UHF I use ham products made for the purpose
Cheers
Gordon kx4z
On Sep 9, 2018, at 13:59, Bill Cromwell
<wrcromwell@... <mailto:wrcromwell@...>> wrote:
Hi,
It might start to be a little shaky on the two meter band.
And maybe will work there too.
73,
Bill KU8H
On 09/09/2018 05:37 AM, gonewiththeego@...
<mailto:gonewiththeego@...> wrote:
I was thinking about an Albrecht SWR 20 which I can see
that is used
only for CB. Do you think it should work for 20/40m
band ?
--
bark less - wag more
--
Michigan VHF Corp.
--
bark less - wag more
|
Raj vu2zap
Nick VK4PP
Ripley
