Re: New Warning on uBITx.net
As a tech class amateur I cannot justify a full featured radio with the limited bandwidth available to me.? I want to upgrade to general class which will open all bands and a dramatic amount of bandwidth.?
This unit has allowed me to dip my toe into HF and learn a bit more of the theory which I lacked working UHF and VHF FM for 25 years.? I am hooked on QRP operation and will learn much more using this radio in low power for discovery of good antenna systems.?
Simple is beautiful and a unit with one button, one knob, and a tuner is quite pretty to me.?
John N3ODE
?
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Re: Raduino Clone kit from W0EB-N5IB
#ubitx
Wow.? The response to this has been extremely positive and the supply of boards is getting low.? Originally ordered 20 boards and there are only 6 left available as bare boards or kits.? These will be available until the supply runs out.
At that point I'll decide whether or not to order another 20 boards to keep them available.
Thanks to all those who ordered one or more for their support.?
Jim Sheldon, W0EB
www.w0eb.com
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Re: New Warning on uBITx.net
Yes, Scott.
// hiro, JJ1FXF 2018/08/08 20:32¡¢Scott McDonald via Groups.Io < ka9p@...&²µ³Ù;¤Î¥á©`¥ë:
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A basic thought could be that a professional radio man would read the statements on Farhan¡¯s website that this is a kit, offered AS IS, not warrantied to any specification, and would not take it on board, eh?
The radio and the open collaboration of the people on this reflector to teach others and make it better has been to me one of the most amazing and positive amateur radio experiences I¡¯ve had. ?
Cheers, Scott KA9P Make something good happen! On Aug 8, 2018, at 4:05 AM, Timothy Fidler < engstr@...> wrote: Boll_ks. there is no fix . there is a maybe fix in the? works. Some people who use or try to? this kit are professional radio men on ships and the like and they don't want their professional blotter compromised by a prosecution from the SMA / FCC and the like .. or even an investigation.? Your statement lacks any level of basic thought IMHO. Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Wed, 8 Aug 2018 09:53:37 +0100
Subject: Re: [BITX20] New Warning on
Bit OTT considering a fix was sorted within a couple of days.
?
? ? I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears on the first (permanently fixed) post:
WARNING:??Issues have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements. A reminder that has no association with HF Signals.? It is purely an information site. I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and weaknesses page with a similar message. 73 Mike ZL1AXG
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Re: New Warning on uBITx.net
A basic thought could be that a professional radio man would read the statements on Farhan¡¯s website that this is a kit, offered AS IS, not warrantied to any specification, and would not take it on board, eh?
The radio and the open collaboration of the people on this reflector to teach others and make it better has been to me one of the most amazing and positive amateur radio experiences I¡¯ve had. ?
Cheers, Scott KA9P Make something good happen!
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Show quoted text
On Aug 8, 2018, at 4:05 AM, Timothy Fidler < engstr@...> wrote: Boll_ks. there is no fix . there is a maybe fix in the? works. Some people who use or try to? this kit are professional radio men on ships and the like and they don't want their professional blotter compromised by a prosecution from the SMA / FCC and the like .. or even an investigation.? Your statement lacks any level of basic thought IMHO. Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Wed, 8 Aug 2018 09:53:37 +0100
Subject: Re: [BITX20] New Warning on
Bit OTT considering a fix was sorted within a couple of days.
?
? ? I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears on the first (permanently fixed) post:
WARNING:??Issues have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements. A reminder that has no association with HF Signals.? It is purely an information site. I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and weaknesses page with a similar message. 73 Mike ZL1AXG
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Re: reverse polarity protection (ubitx.net)
Here is a more meaningful diagram
On Wed, Aug 8, 2018 at 4:17 PM Mvs Sarma < mvssarma@...> wrote: I got your point Mike ?I shall upload a suitable diagram with jack more understandable.
On Wed, Aug 8, 2018 at 1:17 PM Mike Woods < mhwoods@...> wrote:
MVS Sarma
It is the drawing of the jack that people are referring to, not
the positioning of the fuse!
The vertical bar would normally represent the sleeve - and you
have this connected to the fuse and on to +12v??? Shouldn't the
sleeve and the tip be reversed in the diagram?? Or do you normally
have the sleeve positive and the tip negative (some people do -
but most don't) in which case the diode is shown incorrectly!
73
Mike
On 8/08/18 12:34 AM, Mvs Sarma wrote:
Sarma surely responds.
?The reverse protection diode has been shown in the ubitx
sch , both v3 and v4 perhaps.
?I would only suggest that let us have a fuse in series to
dc of say 5 amps. the reverse diode would sit after the fuse
to ground.
?Any accidental reverse connection , the fuse would blow
and reverse voltage would not continue to the actual circuit,
once fuse blows.
|
Re: reverse polarity protection (ubitx.net)
I got your point Mike ?I shall upload a suitable diagram with jack more understandable.
On Wed, Aug 8, 2018 at 1:17 PM Mike Woods < mhwoods@...> wrote:
MVS Sarma
It is the drawing of the jack that people are referring to, not
the positioning of the fuse!
The vertical bar would normally represent the sleeve - and you
have this connected to the fuse and on to +12v??? Shouldn't the
sleeve and the tip be reversed in the diagram?? Or do you normally
have the sleeve positive and the tip negative (some people do -
but most don't) in which case the diode is shown incorrectly!
73
Mike
On 8/08/18 12:34 AM, Mvs Sarma wrote:
Sarma surely responds.
?The reverse protection diode has been shown in the ubitx
sch , both v3 and v4 perhaps.
?I would only suggest that let us have a fuse in series to
dc of say 5 amps. the reverse diode would sit after the fuse
to ground.
?Any accidental reverse connection , the fuse would blow
and reverse voltage would not continue to the actual circuit,
once fuse blows.
|
Re: New Warning on uBITx.net
I deplore the ad hominem attacks. ?
On Aug 8, 2018, at 05:39, Timothy Fidler < engstr@...> wrote:
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so those LPFs wll be sent out free of charge to all those who bought units up until now? and fitted complete with an installed by others? software upgrade for all persons who bought a Bit x and even those who bought them second hand in the meantime. And?
At no cost ,not even the cost of getting it back to a non existent US or Ozzie service centre. ??
?If I bought a S+W revolver in the US and used standard S and W? ammo and the cylinder blew out I would expect a new one or a refund. It is called "fitness for purpose" and is often used in the courts.? Cf.? the reasonably recent VW emissions fraud business.
Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To:
<[email protected]>
Cc:
Sent:
Wed, 8 Aug 2018 10:21:49 +0100
Subject:
Re: [BITX20] New Warning on
As a retired ¡®professional radio man¡¯, not on ships, I do not think that those people who have worked on the LPF and improved the performance are liars. The fix is to use external LPFs ?for now. That is at a basic level of thought of course.
?
?
?
?
Boll_ks. there is no fix . there is a maybe fix in the? works. Some people who use or try to? this kit are professional radio men on ships and the like and they don't want their
professional blotter compromised by a prosecution from the SMA / FCC and the like .. or even an investigation.? Your statement lacks any level of basic thought IMHO.
Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
?
----- Original Message -----
?
<[email protected]>
?
Wed, 8 Aug 2018 09:53:37 +0100
Re: [BITX20] New Warning on
Bit OTT considering a fix was sorted within a couple of days.
?
?
?
I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears
on the first (permanently fixed) post:
WARNING:??Issues
have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements.
A reminder that
has no association with HF Signals.? It is purely an information site.
I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and
weaknesses page with a similar message.
73 Mike ZL1AXG
|
Just a off topic. Is there anyone out there who is working for a project with an antenna analizer ¡°RigExper AA-30.ZERO¡±?   It¡¯s a reasonable commercial quality antenna analizer which Arduino can control and get analizer data from. I ordered the one today and will have it in next week, I suppose. // hiro, JJ1FXF
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Re: New Warning on uBITx.net
As a retired ¡®professional radio man¡¯, not on ships, I do not think that those people who have worked on the LPF and improved the performance are liars. The fix is to use external LPFs ?for now. That is at a basic level of thought of course. ? ? ?
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From: [email protected] <[email protected]> On Behalf Of Timothy Fidler
Sent: 08 August 2018 10:05
To: [email protected]
Subject: Re: [BITX20] New Warning on uBITx.net? Boll_ks. there is no fix . there is a maybe fix in the? works. Some people who use or try to? this kit are professional radio men on ships and the like and they don't want their professional blotter compromised by a prosecution from the SMA / FCC and the like .. or even an investigation.? Your statement lacks any level of basic thought IMHO. Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@... ?
----- Original Message -----
? <[email protected]> ? Wed, 8 Aug 2018 09:53:37 +0100 Re: [BITX20] New Warning on uBITx.net
Bit OTT considering a fix was sorted within a couple of days. ? ? ? I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears on the first (permanently fixed) post: WARNING:??Issues have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements. A reminder that uBITx.net has no association with HF Signals.? It is purely an information site. I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and weaknesses page with a similar message. 73 Mike ZL1AXG ubitx.net
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Re: New Warning on uBITx.net
If the power amplifier has its lowpass filters will they still find outside or within the low?
Il 08/ago/2018 11:02, "Timothy Fidler" < engstr@...> ha scritto: The note should also cover the uBitx40 because it is marginal as to emissions and many people will add a power amp and find? themselves outside the law. There are other issues with this unit using some components at the limit of the component design capacity and therefore some units will fail early with zero local warranty/repair? service.? ? Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Wed, 8 Aug 2018 20:37:22 +1200
Subject: [BITX20] New Warning on uBITx.net
I felt that I had no choice but to post a warning for potential
uBITx purchasers and existing constructors that there were serious
issues with emissions purity.? The following warning now appears
on the first (permanently fixed) post:
WARNING:??Issues
have been identified recently with the emissions purity of the
?BITx.? It is recommended that you study??on this website and
avoid operations that could breach emissions requirements.
A reminder that
uBITx.net has no association with HF Signals.? It is purely an
information site.
I am sorry that the
situation has resulted in requiring such a warning.?? I have also
updated the strengths and weaknesses page with a similar message.
73 Mike ZL1AXG
|
Re: New Warning on uBITx.net
Boll_ks. there is no fix . there is a maybe fix in the? works. Some people who use or try to? this kit are professional radio men on ships and the like and they don't want their professional blotter compromised by a prosecution from the SMA / FCC and the like .. or even an investigation.? Your statement lacks any level of basic thought IMHO. Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Wed, 8 Aug 2018 09:53:37 +0100
Subject: Re: [BITX20] New Warning on uBITx.net
Bit OTT considering a fix was sorted within a couple of days.
?
? ? I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears on the first (permanently fixed) post:
WARNING:??Issues have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements. A reminder that uBITx.net has no association with HF Signals.? It is purely an information site. I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and weaknesses page with a similar message. 73 Mike ZL1AXG ubitx.net
|
Re: New Warning on uBITx.net
Bit OTT considering a fix was sorted within a couple of days. ? ?
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Show quoted text
From: [email protected] <[email protected]> On Behalf Of Mike Woods
Sent: 08 August 2018 09:37
To: [email protected]
Subject: [BITX20] New Warning on uBITx.net? I felt that I had no choice but to post a warning for potential uBITx purchasers and existing constructors that there were serious issues with emissions purity.? The following warning now appears on the first (permanently fixed) post: 
WARNING:??Issues have been identified recently with the emissions purity of the ?BITx.? It is recommended that you study??on this website and avoid operations that could breach emissions requirements. A reminder that uBITx.net has no association with HF Signals.? It is purely an information site. I am sorry that the situation has resulted in requiring such a warning.?? I have also updated the strengths and weaknesses page with a similar message. 73 Mike ZL1AXG ubitx.net
|
I felt that I had no choice but to post a warning for potential
uBITx purchasers and existing constructors that there were serious
issues with emissions purity.? The following warning now appears
on the first (permanently fixed) post:
WARNING:??Issues
have been identified recently with the emissions purity of the
?BITx.? It is recommended that you study??on this website and
avoid operations that could breach emissions requirements.
A reminder that
uBITx.net has no association with HF Signals.? It is purely an
information site.
I am sorry that the
situation has resulted in requiring such a warning.?? I have also
updated the strengths and weaknesses page with a similar message.
73 Mike ZL1AXG ubitx.net
|
Re: reverse polarity protection (ubitx.net)
MVS Sarma
It is the drawing of the jack that people are referring to, not
the positioning of the fuse!
The vertical bar would normally represent the sleeve - and you
have this connected to the fuse and on to +12v??? Shouldn't the
sleeve and the tip be reversed in the diagram?? Or do you normally
have the sleeve positive and the tip negative (some people do -
but most don't) in which case the diode is shown incorrectly!
73
Mike
On 8/08/18 12:34 AM, Mvs Sarma wrote:
Sarma surely responds.
?The reverse protection diode has been shown in the ubitx
sch , both v3 and v4 perhaps.
?I would only suggest that let us have a fuse in series to
dc of say 5 amps. the reverse diode would sit after the fuse
to ground.
?Any accidental reverse connection , the fuse would blow
and reverse voltage would not continue to the actual circuit,
once fuse blows.
|
Arv,
please re-simulate with real inductances i.e. with a reasonable
Q? of 100.? This limited Q will already introduce a series
resistance ( remember : Q = R /XL). Similar the caps also have a
limited Q but "normally" larger, although I doubt if this is true
for chap SMD caps.
Henning Weddig
DK5LV?
Am 07.08.2018 um 17:46 schrieb Arv
Evans:
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Re.?
BITX-40 LPF Mod
When
I added the parallel capacitance to notch out the 3rd harmonic
the simulator showed
a
very narrow notch.? Today I tried adding a resistance in
series with that parallel capacitor.
The
result is a much broader notch at approximately 21 MHz, but
still with 63 db of attenuation.
The upper trace is frequency response and the lower trace
shows phase shift.? Adding the resistor seems to have
tamed the phase shift so it does not show a dramatic
transition at resonance of L7 and C3.
Next possibly illogical step is to notch out any 2nd
harmonic energy at 14 MHz.? This was done with a series trap
(R3, C1, L4).? With R3 at 1.5 ohms this looks promising.
Upper trace shows frequency response and lower trace is
phase shift.???
Results look like (1) no additional insertion loss, (2)
Reasonably broad notch at 14 MHz, and
The notch at 21 MHz is still there, and (4) overall LPF
roll off still starts at 10 MHz.
Will this actually work in a real-world circuit?? It
will be interesting to find out.? If it does work it
could insure that 2nd and 3rd harmonics can be reduced
to way below FCC requirement for the
BITX-40 transceiver.? The trap idea is interesting
because more traps could possibly be added
to take care of any 12 MHz IF leak-through, or any
other spurious signal that looks like it might
be a problem.?
Could this approach be applied to the uBITX filter
problem...maybe, but I will leave that to people
who are much smarter than myself.
Arv
_._
Glen
VK3PE
That
is something that can be tested.? It doesn't show in the
simulator, but real-world
may
be different.? When I get to actually wiring this it will
be easy to test.
Thanks
for the info.
Arv
_._
On Mon, Aug 6, 2018 at 10:18 PM Glenn < glennp@...>
wrote:
Arv,
I read somewhere that its a good idea to drop the inductor
value by 25% or so, (cant recall exact %) then calculate
the parallel Cap value for the required notch.? Otherwise
i think the RL is compromised.
Or my memory is suspect, quite possible........
vk3pe
|
Alison, ? I should explain, it used to be my job, the repair and re-cal of scopes and spectrum analysers. It is different in a commercial/safety critical environment but without decent calibration you are working blind. Agreed, for amateur use there is a need to know where you are, roughly, and it all goes with knowing how to use the gear. Not saying that any of the tests done on the LPFs are wrong or that people do not know what they are doing but I think all users should be aware of the issues when using such gear. ? Colin ¨C M5FRA ?
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From: [email protected] <[email protected]> On Behalf Of ajparent1/KB1GMX
Sent: 07 August 2018 18:32
To: [email protected]
Subject: Re: [BITX20] One question only... ? Colin,
Two parts to that.? Local calibration standards commercial or home made work.
They are the day to day reference or needed in some gear to cal out cables and?
such.? ?I also have a set of precision mismatches that I've made, measured?
and recorded for testing if the gear is in question.? It also helpful for others as?
with known fixtures and standards I can help them get to a nominal cal.
The other is a budget.? Around here we budget a bit for ESSCO to cal the gear
as its then official to paying clients where traceability may be important. For?
the average ham though if the unit was in cal and the standards still read the?
same save your currency for other things.
To bring this down to earth.? A bunch of known value capacitors, resistors,
and an crystal oscillator of known stability checked against WWV or other
reliable frequency sources are easy to build and use tools to calibrate?
home made instruments with.? ?Even radio stations are handy as they
can be a reference and calibration point.??
However expensive and precision calibration is not required to get answers
good to more?than 3 significant digits.? Often that's more than enough.
Allison
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On Tue, Aug 7, 2018 at 10:44 PM, Doug W wrote:
I am not saying you couldn't run WSPR from an Arduino, but I think you'd be hard pressed to get the same functionality for $10.
Just to clarify I am comparing the Pi for $10 with an Arduino, you still need to add the cost of the shield but even without the shield you'd need at least an LPF either way and the shield gives you a LPF, BPF, and a buffer amp. ? --
|
OK, so transmit works well on both CW and SSB.
I assume that's transmitting into a dummy load.
What kind of antenna do you have?
These are made to work with a good efficient and resonant antenna system, suitable for transmitting.
Ten feet of wire hanging out the window is not going to cut it.
The typical shortwave broadcast receiver has a lot more RF gain so it can deal with crummy antennas,
if the uBitx had that much gain it would overload when used with a decent ham antenna.
You might try touching your antenna coax center conductor to T2 pin 1, coax braid to the groundplane
on the bottom of the rig.? ?This goes around the relays at K1 and K3,
also around the 30mhz lowpass filter at L1,2,3.? Does it get louder?
Also short across the relay contacts labeled M1 and M2.
Those are there just to reduce the kerchunk sound when you hit the PTT switch to transmit.
A bad relay contact would seriously reduce receive audio (probably to nothing at all).
Otherwise it's down to the RF amps at Q10 and Q30, also the audio pre-amp at Q70.
Those are all auto-stuffed surface mount parts, and we seldom hear of trouble with any of that.
But it's possible.
Get some good light and a magnifier of some sort, look for bad solder joints.
What kind of test equipment do you have?
Jerry
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On Tue, Aug 7, 2018 at 08:23 PM, Terence Taylor wrote:
Both CW and SSB are making rated power.
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On Tue, Aug 7, 2018 at 07:49 PM, Howard Fidel wrote:
If you have an interesting project for it that can't be done with an Arduino, I'd like to hear about it.
I missed responding to that part of your post.? I am currently running it as a WSPR beacon in my detached garage.? I am using the shield from TAPR.? I can remote into the ZeroW with my phone via VNC and maintain control.? The RF used to knock out the wifi but I separated the shield with jumper wires and it works fine.? I am not saying you couldn't run WSPR from an Arduino, but I think you'd be hard pressed to get the same functionality for $10. ? --
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Re: S-Meter on Ubitx, trying to get to work..
Yes I did, but I don't know what to put in the various squares after that for values.
Kevin
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Jim Sheldon
