Re: [BITX40] Replacement Raduino Board
Thanks for the various replies.
I will probably try using a bare Arduino Nano board with separate voltage regulator and point to point wiring.
Thanks again.
73 John M0JBA
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On 17 Sep 2018, at 15:08, Dennis Yancey < Kd4epg@...> wrote:
You can order one from HFSignals or there are several replacement boards available. Here is one I have found extremely compatible and very easy to use for this or other uses requiring multiple i2c interfaces and/or si5351. It is made to use the Adafruit breakout board for si5351. By installing sockets for Nano, makes this an extremely easy board to work with.? Search for this in messages...?
- RaduinoI2C, Direct Raduino Replacement, VK4PLN
Don’t forget to calibrate it when you first start it up. -- 72 and God bless KD4EPG
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Re: UBITX...getting to legal ???
IMD is a signal quality thing.? For many digital modes it represents undesired distortion that can increase error rate.
If the IMD is from later stages then it can be a bigger deal as then it can easily be heard as a "broad" signal
and can cause the operator to be unpopular.
Allison
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Re: UBITX Q90 mod with BFR106
Henning
>>Wow: the gain at 80 is nearly 0 dB climbing up to 20 dB up to 100 MHz. My fear is that this amp may be unstable, as its gain is relatively high up to 500 MHz.
Doesn't that cause red flags to show?? ? Near zero gain at 80 I presume meters, really?? I'd expect at least 10db of not much more.
IF the BFR106 shows no gain I'd expect the 3904 to exhibit negative gain (loss).
The fact that it doesn't agree even remotely with actual operating radios should be a question.
Look at the transformer used.? Typical error is using a perfect transformer, the real one is anything but.
Allison
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Re: UBITX Q90 mod with BFR106
Henning,
The model does not have the fact that the transformer is FT43 material with more than
desirable number of turns so by 100mhz its into the absorptive range.
The actual sweeps show its has gain at 120mhz but well down not due to the device but?
the rather horrid layout, transformer, and strays.? Never mind the lossy g10 under it.
Try the same model with 3904, if it not well down the gain curve at 30mhz you model is broken.
Allison
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This board would work well for your Bitx40 as you can design the interfaces to suit your specific requirements,. It does a good job for Bitx40 and uBitx as well.
--
72 and God bless
KD4EPG
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Re: [BITX40] Replacement Raduino Board
You can order one from HFSignals or there are several replacement boards available. Here is one I have found extremely compatible and very easy to use for this or other uses requiring multiple i2c interfaces and/or si5351. It is made to use the Adafruit breakout board for si5351. By installing sockets for Nano, makes this an extremely easy board to work with.? Search for this in messages...?
- RaduinoI2C, Direct Raduino Replacement, VK4PLN
Don’t forget to calibrate it when you first start it up. -- 72 and God bless KD4EPG
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Re: UBITX Q90 mod with BFR106
MRM,
enclosed is the LTSPICE file. The model for Q90 is a standard lib unit (Simens)
Henning
Am 17.09.2018 um 13:44 schrieb MadRadioModder:
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Henning... can you send me that model, or put it in the files section? Thanks in advance. MRM.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Henning Weddig via Groups.Io
Sent: Monday, September 17, 2018 5:01 AM
To: [email protected]
Subject: [BITX20] UBITX Q90 mod with BFR106
All,
I just made a LTSPICEXVII simulation using Allison?s mods.
Wow: the gain at 80 is nearly 0 dB climbing up to 20 dB up to 100 MHz.
My fear is that this amp may be unstable, as its gain is relatively high up to 500 MHz.
Gain >0 dB and phase 330 deg at 500 MHz, this looks like instability!
Even at 1 GHz the gain ist still > 0 dB but the phase close to 360 deg. It looks like this amp is not well behaved.
Henning Weddig
DK5LV
---
This email has been checked for viruses by AVG.
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Re: UBITX Q90 mod with BFR106
Henning... can you send me that model, or put it in the files section? Thanks in advance. MRM.
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Henning Weddig via Groups.Io Sent: Monday, September 17, 2018 5:01 AM To: [email protected]Subject: [BITX20] UBITX Q90 mod with BFR106 All, I just made a LTSPICEXVII simulation using Allison?s mods. Wow: the gain at 80 is nearly 0 dB climbing up to 20 dB up to 100 MHz. My fear is that this amp may be unstable, as its gain is relatively high up to 500 MHz. Gain >0 dB and phase 330 deg at 500 MHz, this looks like instability! Even at 1 GHz the gain ist still > 0 dB but the phase close to 360 deg. It looks like this amp is not well behaved. Henning Weddig DK5LV --- This email has been checked for viruses by AVG. -- …_. _._
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It is no accident that commercial radios are in metal cases. While many of the plastic cases look great, they are not for RF devices.
--
Mike
AI4NS
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Re: UBITX Q90 mod with BFR106
If you haven't missed something, the simulation programme has then a bug!
Il 17/set/2018 12:01, "Henning Weddig via Groups.Io" <hweddig= [email protected]> ha scritto: All,
I just made a LTSPICEXVII simulation using Allison?s mods.
Wow: the gain at 80 is nearly 0 dB climbing up to 20 dB up to 100 MHz. My fear is that this amp may be unstable, as its gain is relatively high up to 500 MHz.
Gain >0 dB and phase 330 deg at 500 MHz, this looks like instability! Even at 1 GHz the gain ist still > 0 dB but the phase close to 360 deg.? It looks like this amp is not well behaved.
Henning Weddig
DK5LV
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I'm using them as external filters with a rotary switch. Still waiting for the final fix for the ubitx.
I got a bunch of QRP Labs kits that I want to expand that use the relay board and filters once we have a fix for the ubitx.
don
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UBITX Q90 mod with BFR106
All,
I just made a LTSPICEXVII simulation using Allison?s mods.
Wow: the gain at 80 is nearly 0 dB climbing up to 20 dB up to 100 MHz. My fear is that this amp may be unstable, as its gain is relatively high up to 500 MHz.
Gain >0 dB and phase 330 deg at 500 MHz, this looks like instability! Even at 1 GHz the gain ist still > 0 dB but the phase close to 360 deg.? It looks like this amp is not well behaved.
Henning Weddig
DK5LV
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Hi Ed,
well it seems you found the problem.
If none of the D inputs work then perhaps your Nano is faulty and needs to
be replaced.
73 Allard PE1NWL
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On Mon, September 17, 2018 03:16, taycheel@... wrote: Turns out that nothing on D port works. I redefined all the unused (so
far) inputs onto the analog DOT pin and now everything that can be done
with the function button alone works great and I have a working radio
again. It's some hardware problem somewhere and nothing to do with the
fine software version. I never knew the problem before since the code
shipped didn't use anything on that port. I'll need to figure out at least
one more input as I really would like to get SPOT working as well.
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Just a question about using EMI ferrites. Can they be used in the large connectors (Raduno and audio) or would they make more troubles, eg. lowering the output of the oscillators or whatelse?
Il 17/set/2018 06:55, "Larry Plummer" < lplummer@...> ha scritto: Thanks for the suggestions.? I put ferrites on all of the cables which do not run near the PA section.? Did not help.? I lined the inside of my plastic enclosure with aluminum foil which is grounded and that did solve the problem.
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Re: UBITX...getting to legal ???
But I am not aware that IMD per se may be illegal unless this causes splattering beyond limits. And I am not convinced that using a ham transceiver, maybe except for the latest Icoms, may be enough to have good IMD TX audio. Listening to HF sometimes you hear really distorted modulations and I don't think they all are produced by uBitxs. Having said this about a cleaner TX audio from the uBitx is always welcome.
Il 17/set/2018 08:34, "iz oos" < and2oosiz2@...> ha scritto: I think that old protocol, as well as Pactor II, is currently used to send winlink emails over HF by hams for civil defence purposes.
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Re: UBITX...getting to legal ???
Around 1000-1300 connections per month....(data from sept as of now)
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I think that old protocol, as well as Pactor II, is currently used to send winlink emails over HF by hams for civil defence purposes.
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Re: UBITX...getting to legal ???
I think that old protocol, as well as Pactor II, is currently used to send winlink emails over HF by hams for civil defence purposes.
Il 17/set/2018 02:02, "ajparent1/KB1GMX" < kb1gmx@...> ha scritto: Gordon,
I thought that protocol was dead.
Broad terms many modes do not tolerate extreme distortion. Others are designed
to tolerate it or work despite? distortion.
Allison
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Re: UBITX...getting to legal ???
Nope, WINMOR is still in very wide usage. ? Our group used it in a practice exercise two days ago when ARDOP hiccuped. ?Many days Cuban hams pull NWS wx briefings from my gateway —30 kB— using it. ?For people without a pactor modem it is excellent. ?
On Sep 16, 2018, at 20:02, ajparent1/KB1GMX < kb1gmx@...> wrote:
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Gordon,
I thought that protocol was dead.
Broad terms many modes do not tolerate extreme distortion. Others are designed
to tolerate it or work despite? distortion.
Allison
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Thanks for the suggestions.? I put ferrites on all of the cables which do not run near the PA section.? Did not help.? I lined the inside of my plastic enclosure with aluminum foil which is grounded and that did solve the problem.
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MadRadioModder
Allard PE1NWL
