Re: High Frequency Choke for Bitx40
Thank you for the links to the calculators.? The part I don't understand is what frequency range I'm trying to filter.? The choke that Akira JJ1EPE calls for goes in the power supply line for the Raduino.? What frequencies or type of interference is it meant to block???
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Re: Harmonics and Relay Replacement
Looking at the differences between the original Hongfa relays -S (for sensitive) version in my uBITX boards and the Axicom relays Mike Doty and I installed in place of them, the Axicom had lower coil resistance in the 400 mW coils vs the 200 mW coils fot the Hongfa relays. ?That means fewer turns of wire in the Axicoms and subsequently less inductance. ?That may be a huge factor in the isolation between the two types. ?The coil resistance for the Axicom that matches the Hongfa in DC spec aldo has the exact same listed coil resistance. ?
I'm going to order 5 each of the 150mW, 200 mW and 500 mW versions, put sockets on my 3rd V4 board and see how much difference there is between the 3 other types relative to the already installed 400 mw version. ?Hopefully that will give us some definitive answers. ?Be Monday before I can order them so it will be a few days before any testing can be done.
Jim Sheldon, W0EB
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Re: Recommended fixes on ubitx.net
Yes I agree. Thanks Mike. Between your site and the wiki I was able to get a wealth of information and perform the mods without having to be a rocket scientist level electrical engineer. Kudos to ?
Joe
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On Oct 13, 2018, at 4:45 AM, F1BFU - Fr - 79 < gilles.f1bfu@...> wrote: Hello Mike
Thank you very much for the work you do for . This site is really a mine of information for all those who have embarked on the adventure ubitx.
Gilles - F1BFU /FR Le?sam. 13 oct. 2018 ¨¤?00:39, Mike Woods < mhwoods@...> a ¨¦crit?: With two simple new fixes available to address the spectral purity
issues associated with the uBITx, I have been busy updating the
website this morning.? This includes an update to the the
warning message on the front page, clarifying the fact that simple
solutions exist to spectral issues on? the strengths and weaknesses
page, and the addition of a new "fix" page located here:
I have also updated the recommended fixes and mods page
located here:
Hopefully this will encourage more people to get into the wonderful
world of the uBITx, and keep the factory in peak production!
Mike ZL1AXG
--
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good evening
I have a problem with a BITX40 that never worked! I replaced the motherboard because I thought the problem was there. It is not so! Only the raduino remains! I wrote an email to HF-signals to find out how much the raduino costs, but they did not even answer me! Now I'm going to buy the kit on qrp-labs but I have a doubt! I had a raduino checked by a technician and a test with oscilloscope actually comes out the frequency of 5 mhz as it should be! Only when I connect it to the motherboard it totally changes the result!
?
Is this correct or does it have problems?
?
How can I test the radio with the old tuning system without the raduino?
What changes do I have to make?
?
Thanks Sergio
?
Sorry for my English!
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Re: Harmonics and Relay Replacement
Mike,
Now THAT spec from Farnell was what I was looking for.? The 151 pages have a lot of good RF information not found elsewhere.....but will take a little time to digest.
73 Kees K5BCQ??
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The original on the my test board toroid inductance was `560nH and I
added another 2 turns..? to make it nearer to
720nH as stated. not helped! Shielding did not help.
At 13/10/2018, you wrote:
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Raj
seeing that you?? used a lower inductance, could it be that there is
too much inductance in the Toroid ones?
Did or could you experiment with other values?
Could you try to lower the originalTtoroid inductance and see if it makes
any difference?
Thanks.
On Sat, Oct 13, 2018 at 5:48 AM Raj vu2zap
<
rajendrakumargg@...> wrote:
- I did that and it did not help much!
- Raj
- At 13/10/2018, you wrote:
- >Do you think mounting the original toroids on the bottom of the
board would work?
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Re: Harmonics and Relay Replacement
Did anyone check whether there is any difference in the attenuation with the different Axicom relays? What I mean is that according to some posts it appears that the relays have different sensitivities and different inductance values. So did anyone check or could, or intend to check whether there is any difference in using one or the other? Thanks
Jim,
Yes, I've seen that posted by you before......but what did they do specifically for RF use ? some spacings ? shielding ? coil core material ? base dielectric ? housing dielectric ?
I also see Axicom has 4 coil power options (like most of the other relay vendors). Which one is correct and which one did you order ?
73 Kees K5BCQ
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Raj seeing that you? used a lower inductance, could it be that there is too much inductance in the Toroid ones?
Did or could you experiment with other values? Could you try to lower the originalTtoroid inductance and see if it makes any difference? Thanks.
I did that and it did not help much!
Raj
At 13/10/2018, you wrote:
>Do you think mounting the original toroids on the bottom of the board would work?
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Re: Harmonics and Relay Replacement
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Il 13/ott/2018 10:19, "Glenn" < glennp@...> ha scritto: Interesting...... the price for V23105A5403A201 relays from Farnell in VK was AU$2.28 a few days ago. Its now $3.97
glenn vk3pe
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Re: Harmonics and Relay Replacement
After all seller groups would make use of any sudden spurt in demand
of a product.
After ham community identified the use and benefits of axicom relays,
the sellers would obviously raise the costs.
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On Sat, Oct 13, 2018 at 2:03 PM Raj vu2zap <rajendrakumargg@...> wrote:
One of them must be on this group!
Raj
At 13/10/2018, you wrote:
Interesting...... the price for V23105A5403A201 relays from Farnell in VK was AU$2.28 a few days ago. Its now $3.97
glenn vk3pe
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Re: Recommended fixes on ubitx.net
Hello Mike
Thank you very much for the work you do for . This site is really a mine of information for all those who have embarked on the adventure ubitx.
Gilles - F1BFU /FR
Le?sam. 13 oct. 2018 ¨¤?00:39, Mike Woods < mhwoods@...> a ¨¦crit?: With two simple new fixes available to address the spectral purity
issues associated with the uBITx, I have been busy updating the
website this morning.? This includes an update to the the
warning message on the front page, clarifying the fact that simple
solutions exist to spectral issues on? the strengths and weaknesses
page, and the addition of a new "fix" page located here:
I have also updated the recommended fixes and mods page
located here:
Hopefully this will encourage more people to get into the wonderful
world of the uBITx, and keep the factory in peak production!
Mike ZL1AXG
|
Re: Harmonics and Relay Replacement
One of them must be on this group!
Raj
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At 13/10/2018, you wrote: Interesting...... the price for V23105A5403A201 relays from Farnell in VK was AU$2.28 a few days ago. Its now $3.97
glenn vk3pe
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Re: Harmonics and Relay Replacement
Interesting...... the price for V23105A5403A201 relays from Farnell in VK was AU$2.28 a few days ago. Its now $3.97
glenn vk3pe
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Re: Harmonics and Relay Replacement
Mike
I suspect that the bracketed phrase (current tested) in the datasheet may be to the relevant clue for this relay (5476). Presumably they are tested to meet the 3A switching capacity.
All of the D2n relays are? BT47 relays it seems, but this series 54xx are designed for British Telecom use (and presumably tested to BT requirements).? 47 W / 6 is the BT classification for a 12v coil relay of BT47 specs.?? Hence the 476 in the number.?? I gleaned this from a read of the Farnell spec.?? I suspect they might be slightly more expensive, but I haven't looked...? I suspect they are still compatible.
I didn't realise that photo had a different number on it until you pointed it out ... I checked only the opening and closing numbers!? I will remove the photo just in case.
Mike
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On 13/10/18 5:41 PM, Mike Doty via Groups.Io wrote:
One thing I want to mention is that I saw over on the ubitx.net site that Mike has posted a picture of an Axicom relay with a part number of V23105A5476A201.? Looking in the PDF document and the D2n datasheets, this particular relay is listed separately from the ones we are discussing.? While it is a 12V relay I haven't been able to confirm that this relay is RF rated.? It's listed as BT47 type with a coil resistance of 280 ohms.? What makes this relay different from the 503 relay isn't clear, other than it is rated for more than 500mW, but there must be reason that it is listed in a separate category.? In case anyone is interested and wants to try this relay, Newark has them on sale right now for $0.99 each.? I purchased 20 this morning and when they arrive I will be cutting the case off of one, as well as dissecting one of the 400mW relays, to do a visual comparison.? I'll post pictures of my results.? I don't think I will be pulling the existing relays off of my rigs to actually test them though:-)
--
Mike Woods
mhwoods@...
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Embarrassed to ask, but... I've just tried for the first time to upgrade my uBITX software to the current KD8CEC release and must have missed something obvious.
?
After unzipping the files, I compiled the file with 1602 in it that I thought was for the standard LCD display, it compiled and loaded fine, and I saw a screen of small w's.
?
I powered down and back and got the top row of squares.
?
Did I compile the wrong file, or is there something else I've missed??
?
As this was the first shot at this, I loaded the file onto my spare, out of the radio Raduino, if that makes any difference, but I thought I've read it doesn't.
?
Thanks, a lot.?
?
Scott ka9p
?
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-----Original Message-----
From: Mike Woods <mhwoods@...>
To: BITX20 < [email protected]>
Sent: Fri, Oct 12, 2018 11:18 pm
Subject: Re: [BITX20] Recommended fixes on ubitx.net
Thanks Dave
It's been more work than I imagined, but it is a pleasure to see
so many constructors having fun and extending the functionality of
the uBITx.
73 Mike ZL1AXG
On 13/10/18 2:54 PM, davedt1e@... wrote:
Mr Woods,
I can't thank you enough for Ubitx.net.? It's very difficult to
keep up with everything here in the groups...or find previous
postings.? It's very helpfull to have it all neatly summarized
over there.
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Re: Harmonics and Relay Replacement
Kees,
Since I started this, let me jump in here for a minute.? My intention in starting this thread was simply to provide information on favorable results that I had.? I appreciate that Jim jumped in with both feet and tested what I presented and that you are delving even farther into the effort.? I would like to hear from others that try the Axicom relays and have the test equipment to do further evaluations.? That's what makes this group such a great place to share ideas and gather info.
There is a PDF document with data on all of the TE Axicom relays available at .? It's rather lengthy and I've spent a lot of time going thru it trying to answer some of my own questions.? As I said in my original post, I used the V23105A5403A201 400mW relays because that was what I had.? Will one of the higher or lower coil value relays work better or worse - I can't say.? One thing I do notice is the major difference between the 4 coil sizes, other than coil resistance, appears to be in the minimum/maximum operating voltages.? All other specs, to include contact capacitance and isolation appears to be the same for all 4. It may be worthwhile for you to download the document and go thru it.? Tyco Electronics does have a website that will allow you to ask questions of their engineers on-line and, as Jim has suggested, if you really want to get in to the weeds that may be the route to take. Since we are talking about possibly affecting a few thousand radios they may be interested in providing additional information and I'm certain that everyone in the group would appreciate any further info that you can glean.
One thing I want to mention is that I saw over on the ubitx.net site that Mike has posted a picture of an Axicom relay with a part number of V23105A5476A201.? Looking in the PDF document and the D2n datasheets, this particular relay is listed separately from the ones we are discussing.? While it is a 12V relay I haven't been able to confirm that this relay is RF rated.? It's listed as BT47 type with a coil resistance of 280 ohms.? What makes this relay different from the 503 relay isn't clear, other than it is rated for more than 500mW, but there must be reason that it is listed in a separate category.? In case anyone is interested and wants to try this relay, Newark has them on sale right now for $0.99 each.? I purchased 20 this morning and when they arrive I will be cutting the case off of one, as well as dissecting one of the 400mW relays, to do a visual comparison.? I'll post pictures of my results.? I don't think I will be pulling the existing relays off of my rigs to actually test them though:-)
Take care and keep digging!
--73-- Mike? --? W0MNE
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Re: Recommended fixes on ubitx.net
Thanks Dave
It's been more work than I imagined, but it is a pleasure to see
so many constructors having fun and extending the functionality of
the uBITx.
73 Mike ZL1AXG
On 13/10/18 2:54 PM, davedt1e@... wrote:
Mr Woods,
I can't thank you enough for Ubitx.net.? It's very difficult to
keep up with everything here in the groups...or find previous
postings.? It's very helpfull to have it all neatly summarized
over there.
|
I think the 1210 shielded one would be best!
Raj
At 13/10/2018, you wrote:
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Mouser??
Mike
K5ESS
?
From: [email protected]
[
mailto:[email protected]] On Behalf Of mark bodlovich
Sent: Friday, October 12, 2018 7:10 PM
To: [email protected]
Subject: Re: [BITX20] Simpler spur fix
?
Been looking around for the 1210 680nh inductors and cannot find a source
yet. I noticed some suppliers only sell in very large quantities like
2000. So has anyone found a source yet or if so would be willing to sell
a few to us who want them. Just putting it out there for consideration.
Please pm me to make arrangements. 73 n7hwr
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From: [email protected] [mailto:[email protected]] On Behalf Of mark bodlovich
Sent: Friday, October 12, 2018 7:10 PM
To: [email protected]
Subject: Re: [BITX20] Simpler spur fix ? Been looking around for the 1210 680nh inductors?and cannot find a source yet. I noticed some suppliers only sell in very large quantities like 2000. So has anyone found a source yet or if so would be willing to sell a few to us who want them. Just putting it out there for consideration. Please pm me to make arrangements. 73 n7hwr
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Jim Sheldon
Raj vu2zap