Yes, since it is a transformer, it is the turns ratio that is most important, though the number of turns can impact the frequency response along with the core material.? I do not have the core material, so I assume that you were able to get that somewhere else.? For HF transformers it is normally powdered iron with size according to power. requirements.

Here is a YouTube on winding a trifilar transformer.? Not sure that the core material that he is using is the same as that used by HFSignals for the transformer.? As you can see in the picture, the transformers are black/clear, not yellow/black as are the type 43 shown.? I do not know the specifications of the HFSignals transformers.

Sorry, I can not be more specific.
73
Evan
AC9TU

-Dave-AD0B ..? What keys do you have in stock.. I am interested in shifting a little of your stock to cash for your ventilator project

Not needed.? A group was created for it.

Vince.

On 03/25/2020 01:12 AM, Raj vu2zap wrote:
> There is something call sub groups that has been long ignored Arv.
>
>
> At 25/03/2020, you wrote:
>> Gordon
>>
>> Still thinking about how to manage the "hams working on ventilators"
>> traffic versus
>> the rest of the BITX-20 group discussions.?? Wonder if it would work
>> to let the ventilator
>> traffic continue but keep it under a very specific #topic header.?
>> This would allow
>> those who are not interested in ventilating to just mute that topic so
>> they would
>> never see it again.?? Your thoughts...?
>>
>> Arv
>> _._
>>
>>
>> On Mon, Mar 23, 2020 at 10:15 PM Gordon Gibby
>> <docvacuumtubes@... <mailto:docvacuumtubes@...> > wrote:
>>
>>? ? ?Thank you Arv.?? ? Probably 35 messages have gone out internal the
>>? ? ?group working on the ventilator in the last 24 hours alone.?? ?
>>? ? ?Two programmers have written working or nearly working code to
>>? ? ?improve on the tiny stuff that I wrote; one press release was
>>? ? ?authorized; a university PIO has come on line, and three
>>? ? ?manufacturers have stepped up to potentially? assist or
>>? ? ?manufacture.?? ? All of that happened with very little email here
>>? ? ?(unless I happened to slip up and sned it to the wrong place and
>>? ? ?if so, I apologize) -- and now we are at the point of moving
>>? ? ?toward a printed circuit board design and final software.?? ?
>>? ? ?Some had ASKED for updates on this forum.?? ? All of this,
>>? ? ?including frantic efforts to find suitable pressure transducers
>>? ? ?etc, fervent discussions of legal matters, and safety concerns and
>>? ? ?some arguments that were a waste of time...all happened outside
>>? ? ?this forum (which was appropriate).?? ? 97.1 indicates amateur
>>? ? ?radio is to be a RESERVOIR of trained people....and this in
>>? ? ?keeping with the outworking of precisely that.?? ? Once a
>>? ? ?sufficient number became involved, there was no further need to
>>? ? ?discuss on this forum (unless by accident I sent the wrong place,
>>? ? ?my apologies).
>>
>>? ? ?THANKS for all who have volunteered their time and expertise, the
>>? ? ?group who started this has been overwhelmed with offers.
>>? ? ?Lets hope this does some good.
>>
>>? ? ?Gordon Gibby KX4Z
>>
>>
>>
>>? ? ?On Mon, Mar 23, 2020 at 11:49 PM Arv Evans <arvid.evans@...
>>? ? ?<mailto:arvid.evans@...>> wrote:
>>
>>
>>? ? ? ? ?A recent ARRL news post highlighted the BITX20 group effort to
>>? ? ? ? ?work up a low cost design for a safe ventilator.? ?
>>
>>? ? ? ? ?These are strange times that might offer an opportunity for
>>? ? ? ? ?hams to "make a difference".?
>>
>>? ? ? ? ?My request is for those not interested in this subject to mute
>>? ? ? ? ?the topic for the next few days.?? Work is ongoing to form a
>>? ? ? ? ?new group to focus directly on this effort.?? This will
>>? ? ? ? ?hopefully move the ventilator messages to that venue.?? If
>>? ? ? ? ?off-topic posts persists after the new group is functioning,
>>? ? ? ? ?those posts can be moderated and redirected to that group.? ?
>>
>>? ? ? ? ?I would ask those who are setting up a new info and control
>>? ? ? ? ?web site for the ventilator project to post a notification
>>? ? ? ? ?here when their site is up and running.?? Once that is done we
>>? ? ? ? ?can take steps to move ventilator traffic over to that new
>>? ? ? ? ?discussion site.
>>
>>? ? ? ? ?Thanks
>>
>>? ? ? ? ?Arv
>>? ? ? ? ?_-_
>>
>>
>>? ? ? ? ?On Mon, Mar 23, 2020, 8:53 PM Jerry Gaffke via Groups.Io
>>? ? ? ? ?<jgaffke=[email protected] <mailto:[email protected]> > wrote:
>>
>>? ? ? ? ? ? ?Ken,
>>
>>? ? ? ? ? ? ?Your best bet is convince the forum moderator, that would
>>? ? ? ? ? ? ?be Arv:
>>? ? ? ? ? ? ??? ? ? /g/BITX20/message/77310
>>
>>? ? ? ? ? ? ?I suppose you could check with Farhan, he may still have
>>? ? ? ? ? ? ?some pull here:
>>? ? ? ? ? ? ??? ? ? /g/BITX20/message/2
>>? ? ? ? ? ? ??? ? ? /g/BITX20/message/77283
>>
>>? ? ? ? ? ? ?Failing the above, perhaps start your own group?
>>
>>? ? ? ? ? ? ?Talk about this pandemic will be everywhere that people
>>? ? ? ? ? ? ?communicate.
>>? ? ? ? ? ? ?If you want to avoid any such discussion, I suggest you
>>? ? ? ? ? ? ?pull the plug on?
>>? ? ? ? ? ? ?your computer, radio and TV till about this time next year.
>>
>>? ? ? ? ? ? ?Back to the topic:? ?
>>? ? ? ? ? ? ?Hopefully, if I need a ventilator, it will be something
>>? ? ? ? ? ? ?fully vetted by the FDA and UL and whatever.
>>? ? ? ? ? ? ?Hard to imagine Tesla and GM producing enough at
>>? ? ? ? ? ? ?sufficiently low cost to satisfy the needs
>>? ? ? ? ? ? ?of every African village.?? This Nano + SprinklerValve
>>? ? ? ? ? ? ?thing may or may not be the answer,
>>? ? ? ? ? ? ?but seems an effort well worth supporting.?
>>
>>? ? ? ? ? ? ?> My vote is to stay on-topic,
>>? ? ? ? ? ? ?I haven't seen a post here about the Bitx20 in ages.?? ;-)
>>
>>? ? ? ? ? ? ?Jerry, KE7ER
>>
>>
>>? ? ? ? ? ? ?On Mon, Mar 23, 2020 at 05:27 PM, Ken Hansen wrote:
>>
>>? ? ? ? ? ? ? ? ?Opinions vary, news of Elon Musk's latest exploits
>>? ? ? ? ? ? ? ? ?have never been covered here before - I see no reason
>>? ? ? ? ? ? ? ? ?to start now.
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?Do we want to start debating the suitability of a
>>? ? ? ? ? ? ? ? ?first-time medical device maker going from blank sheet
>>? ? ? ? ? ? ? ? ?of paper to respirator in a hospital ICU without *any*
>>? ? ? ? ? ? ? ? ?meaningful regulatory review in two weeks?
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?Typically the goal of international groups such as
>>? ? ? ? ? ? ? ? ?this one is to remain apolitical and avoid discussions
>>? ? ? ? ? ? ? ? ?of topics that only affect one region By staying on
>>? ? ? ? ? ? ? ? ?topic. (Remember the "CA State is shutting down all
>>? ? ? ? ? ? ? ? ?repeaters" scare? The "France wants to eliminate the
>>? ? ? ? ? ? ? ? ?2m band" scare? In my opinion those discussions didn't
>>? ? ? ? ? ? ? ? ?belong here either, thought they were arguably Amateur
>>? ? ? ? ? ? ? ? ?Radio-related, unlike the Elon Musk link.) This group
>>? ? ? ? ? ? ? ? ?has a specific purpose on it's
>>? ? ? ? ? ? ? ? ?<> homepage:
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?"This group exists for constructors of the various
>>? ? ? ? ? ? ? ? ?BITX projects, to discuss all aspects of the design
>>? ? ? ? ? ? ? ? ?and construction including problems, components,
>>? ? ? ? ? ? ? ? ?modifications and experiences using the rigs."
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?Source:? /g/BITX20
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?My vote is to stay on-topic, but mine is only one of
>>? ? ? ? ? ? ? ? ?the 7,833 voices on this reflector. I'll happily
>>? ? ? ? ? ? ? ? ?reconsider if/when I hear Elon has ordered a uBitx has
>>? ? ? ? ? ? ? ? ?had some feedback or improvements on the design.
>>? ? ? ? ? ? ? ? ??
>>? ? ? ? ? ? ? ? ?Ken, N2VIP
>>? ? ? ? ? ? ? ? ??
>>
>>? ? ?

--
? ?K8ZW? ? ?

There is something call sub groups that has been long ignored Arv.


At 25/03/2020, you wrote:

Gordon

Still thinking about how to manage the "hams working on ventilators" traffic versus
the rest of the BITX-20 group discussions.?? Wonder if it would work to let the ventilator
traffic continue but keep it under a very specific #topic header.?? This would allow
those who are not interested in ventilating to just mute that topic so they would
never see it again.?? Your thoughts...?

Arv
_._


On Mon, Mar 23, 2020 at 10:15 PM Gordon Gibby <docvacuumtubes@... > wrote:

Thank you Arv.?? ? Probably 35 messages have gone out internal the group working on the ventilator in the last 24 hours alone.?? ? Two programmers have written working or nearly working code to improve on the tiny stuff that I wrote; one press release was authorized; a university PIO has come on line, and three manufacturers have stepped up to potentially? assist or manufacture.?? ? All of that happened with very little email here (unless I happened to slip up and sned it to the wrong place and if so, I apologize) -- and now we are at the point of moving toward a printed circuit board design and final software.?? ?? Some had ASKED for updates on this forum.?? ? All of this, including frantic efforts to find suitable pressure transducers etc, fervent discussions of legal matters, and safety concerns and some arguments that were a waste of time...all happened outside this forum (which was appropriate).?? ? 97.1 indicates amateur radio is to be a RESERVOIR of trained people....and this in keeping with the outworking of precisely that.?? ? Once a sufficient number became involved, there was no further need to discuss on this forum (unless by accident I sent the wrong place, my apologies).

THANKS for all who have volunteered their time and expertise, the group who started this has been overwhelmed with offers.

Lets hope this does some good.

Gordon Gibby KX4Z

On Mon, Mar 23, 2020 at 11:49 PM Arv Evans <arvid.evans@...> wrote:

A recent ARRL news post highlighted the BITX20 group effort to work up a low cost design for a safe ventilator.? ?

These are strange times that might offer an opportunity for hams to "make a difference".?

My request is for those not interested in this subject to mute the topic for the next few days.?? Work is ongoing to form a new group to focus directly on this effort.?? This will hopefully move the ventilator messages to that venue.?? If off-topic posts persists after the new group is functioning, those posts can be moderated and redirected to that group.? ?

I would ask those who are setting up a new info and control web site for the ventilator project to post a notification here when their site is up and running.?? Once that is done we can take steps to move ventilator traffic over to that new discussion site.

Thanks

Arv

_-_

On Mon, Mar 23, 2020, 8:53 PM Jerry Gaffke via Groups.Io <jgaffke=[email protected] > wrote:

Ken,

Your best bet is convince the forum moderator, that would be Arv:

?? ? ? /g/BITX20/message/77310

I suppose you could check with Farhan, he may still have some pull here:

?? ? ? /g/BITX20/message/2

?? ? ? /g/BITX20/message/77283

Failing the above, perhaps start your own group?

Talk about this pandemic will be everywhere that people communicate.

If you want to avoid any such discussion, I suggest you pull the plug on?

your computer, radio and TV till about this time next year.

Back to the topic:? ?

Hopefully, if I need a ventilator, it will be something fully vetted by the FDA and UL and whatever.

Hard to imagine Tesla and GM producing enough at sufficiently low cost to satisfy the needs

of every African village.?? This Nano + SprinklerValve thing may or may not be the answer,

but seems an effort well worth supporting.?

> My vote is to stay on-topic,

I haven't seen a post here about the Bitx20 in ages.?? ;-)

Jerry, KE7ER

On Mon, Mar 23, 2020 at 05:27 PM, Ken Hansen wrote:

Opinions vary, news of Elon Musk's latest exploits have never been covered here before - I see no reason to start now.

?

Do we want to start debating the suitability of a first-time medical device maker going from blank sheet of paper to respirator in a hospital ICU without *any* meaningful regulatory review in two weeks?

?

Typically the goal of international groups such as this one is to remain apolitical and avoid discussions of topics that only affect one region By staying on topic. (Remember the "CA State is shutting down all repeaters" scare? The "France wants to eliminate the 2m band" scare? In my opinion those discussions didn't belong here either, thought they were arguably Amateur Radio-related, unlike the Elon Musk link.) This group has a specific purpose on it's homepage:

?

"This group exists for constructors of the various BITX projects, to discuss all aspects of the design and construction including problems, components, modifications and experiences using the rigs."

?

Source:? /g/BITX20

?

My vote is to stay on-topic, but mine is only one of the 7,833 voices on this reflector. I'll happily reconsider if/when I hear Elon has ordered a uBitx has had some feedback or improvements on the design.

?

Ken, N2VIP

?

Loop antennas; Amongst the loop antenna manufacturers, what does the group prefer: chameleons, either F or P, or any of the alpha loops?

I have no interest in dipoles, end not off center fed, anything or whips only loops preferably from 3 to 30. Not interested in something that bottoms out at 7 MHz, and would prefer something that could at least hit 50 if not100 W output SSB. Speak to you fine folks.

On Wed, Mar 25, 2020 at 04:40 AM, Mark - N7EKU wrote:

Hi,

Rene said from before that he is using a dummy load, so that is not the problem.

I suppose there could be a problem with the raduino/display connection.? That could be sorted by doing a conductivity test using your multimeter for each pin to socket connection on the raduino connection.? Can you do that Rene?

Another suspected problem with the peeping could be that your HT receiver is too close. It kind of depends on how well shielded the transceiver and dummy load are.? But maybe you can try to have someone listen from another room in your house while you transmit?

I don't remember the status though, of your power out.? You have a known good power meter connected between your transceiver and dummy load?? Do you get power out using CW and a telegraph key plugged into the key jack (or shorted by hand)?? Still no power out when whistling in SSB mode?

You should eliminate the coax cables too.?? Unplug the coax connector from your transceiver and measure across the connector.? If you have a dummy load at the other end, you should have a reading of 50 ohms or so.? Sometimes even brand new cables can be bad, so it is good to check them and eliminate them as a suspect.

If after all this, your radio still tests bad, I think something needs to be done via the vendor to help you out.? But do all these tests to make sure first.

Last thing, spinning the dial fast can cause problems for inexpensive encoders.? They should work fine at lower speeds, but can't handle fast rotations.? They kind of have a "speed limit" like a Yugo? :-p

73,


Mark

?Okay Mark thx for fast answereing, tommorroe i am gonna try al those things.. but for now, yes i use an dummy load, and furter no cables in the near. The receiver is an yupiteru mvt 7100 with dummy antenna on it(tryed also normal antenna) and i did put the ATT on so more weak receiving. Mayby i have to try on a diffrent place furter in the house. I have an 3 meters swr meter, swr,modulation and power. Swr stays on 0?, modulation half but power on 20 meter more then 10, on 40 meter maybe 1 or 1.5 watts.
But i shall try to measure with the multimeter. Not today, beautiful weather so going fushin onsea. Again thanks for the tips. Brings down my frustration ?