@Vince - OK well at least it's not just me then. Bit of a shame but not that surprised, it was exceptionally cheap.

@Arv - Yes don't see why this isn't possible. I've not seen any work done on this in my? extensive research on B40 mods.. You could make a feature request to Allard perhaps :-)

Hi all

I am new to this group and just got uBitx from the custom...only 22% VAT was added

I am wondering if uBitx? can somehow work on 472kHz amateur band?

Kari OH5YW

The Red LED on the Arduino board is on solid.

Followup on the Builders Fest in East TN, it was great, ask Dr. Jack, he packed the house with Bitx enthusiasts. And the hamfest with its indoor arena tailgating was at capacity for the first time ever. ?

No Doubt BitXes brought a good number of them in.

I was hoping to have some nice pictures, so I could have posted a link by now and said, here go look....but, clubs being what they are, I am not taking the hit, I had a few of the contributors on the board contribute to door prizes and guys I am struggling to get pictures of what took place. ?The club has chosen to suppress any pictures....for reasons I can only guess pretty accurate. ?So, I am disappointed in myself for not believing what I was experiencing....So enough of that,?

The enthusiasm was there for the expo, to do what Farhan is doing and actually have builds on the spot....wow....what I do to get to one of those....can't make it to India, I hope he has better luck with pictures.

Craig?
KM4YEC

let me be the first to say...you are mistaken.?

I am interested. ?I would surely be safe to say there are others....

I invited BitXes to East Tennessee, USA ?just yesterday, and I very badly wanted to share the results with everyone here to show that very point, just how much interest there is. The BitXes showed up from Washington State, Arkansas, Kentucky, Virginia, and images of BitX40s were sent in from the Netherlands and Venezuela....and maybe other places, I have to admit I don't know the full extent of my production in East TN, as my EX-club as of yesterday, cut me off from feedback before the show even started, and I won't be getting any photos and Christmas Cards either. ?But, I got Dr. Jack and bunch of BitXes to East TN.....so....you betcha we are interested.?

Dr. Jack filled the house with BitX enthusiasts.

I say, please share, and others take notes. ?Please have some kind of photo record to share.?

Craig
KM4YEC

Jack,
Thank you for the draft copy of the chapter from your book!? I put the book on my wife's Amazon wish list and told her I would really love it for my birthday this month.... Crossing my fingers...:)
Tom
AB7WT

PS - If I don't get it for my BDAY I'll just buy it asap....:)

If you're having problems with audio harmonics, yes, you would want to put your tones higher than the midpoint of the filter....but with any reasonable sound card, there should be negligible harmonics, so I don't completely understand the issue or concern....I use $5 Adafruit 1475 usb dongles without any untoward effects that I know of....


________________________________________
From: [email protected] <[email protected]> on behalf of Tim Gorman <tgorman2@...>
Sent: Sunday, January 7, 2018 11:53 PM
To: [email protected]
Subject: Re: [BITX20] Tuning reversed issue

With a 2.4khz to 2.5khz filter you wouldn't want to run the tones any
lower than about 1.25khz so you could filter out any audio harmonics,
right?

My guess is that if you are generating audio harmonics you have
something else badly wrong!

tim ab0wr

On Mon, 8 Jan 2018 04:46:35 +0000
"Gordon Gibby" <ggibby@...> wrote:

Using FLDIGI, you can put your RTTY tonesanywhere you want them.....

And by watching the waterfall, you can visualize your receiving
filter as well.

gordon

With a 2.4khz to 2.5khz filter you wouldn't want to run the tones any
lower than about 1.25khz so you could filter out any audio harmonics,
right?

My guess is that if you are generating audio harmonics you have
something else badly wrong!

tim ab0wr

On Mon, 8 Jan 2018 04:46:35 +0000
"Gordon Gibby" <ggibby@...> wrote:

Using FLDIGI, you can put your RTTY tonesanywhere you want them.....

And by watching the waterfall, you can visualize your receiving
filter as well.

gordon

Using FLDIGI, you can put your RTTY tonesanywhere you want them.....

And by watching the waterfall, you can visualize your receiving filter as well.

gordon


________________________________________
From: [email protected] <[email protected]> on behalf of Tim Gorman <tgorman2@...>
Sent: Sunday, January 7, 2018 11:36 PM
To: [email protected]
Subject: Re: [BITX20] Tuning reversed issue

Jim,

Aren't RTTY tones 2125hz and 2295hz? The filter in the ubitx should be
narrow enough to filter out 2nd and 3rd harmonics of these frequencies.

If it can't filter out the harmonics of these tones then the SSB voice
signal is probably also far wider than it should be.

tim ab0wr



On Sun, 07 Jan 2018 18:11:44 -0800
"Jim Sheldon" <w0eb@...> wrote:

After Ron helped me get over the "stupids" and I finally learned how
to properly compile & upload stuff to the Raduino, I now have Ron's
mods running and he's fixed a lot of little annoying things (annoying
to me anyway). In between bricking & fixing the rig (all firmware,
no hardware) I managed to make a couple of real nice 20 meter SSB
QSO's and also a couple of 40 meter CW QSO's as well with it.

I heard a lot of RTTY (contest this weekend) and sure wish there were
at least 5 more digital pins on the Nano. Then it would really easy
to implement a good CW Keyer and even implement true FSK for RTTY.
You'd still need a computer with sound card running something like
Mako Mori's (JE1HHT) MMTTY program, but that would really work well.
Hardware FSK would be much cleaner to implement than tones into the
SSB section. As wide as the filter is, I'd be wary of the 2nd and
maybe even 3rd harmonics of the tones being transmitted at the same
time as the fundamentals. That would really create havoc on the
bands especially during a RTTY contest, not to mention incur the
wrath of the FCC as well.

Jim - W0EB

This little rig just keeps getting better and quite rapidly too!

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There is plenty of overlap in the inductance rank now. ?The final kit will probably be closer to doubling.?

Jim,

Aren't RTTY tones 2125hz and 2295hz? The filter in the ubitx should be
narrow enough to filter out 2nd and 3rd harmonics of these frequencies.

If it can't filter out the harmonics of these tones then the SSB voice
signal is probably also far wider than it should be.

tim ab0wr



On Sun, 07 Jan 2018 18:11:44 -0800
"Jim Sheldon" <w0eb@...> wrote:

After Ron helped me get over the "stupids" and I finally learned how
to properly compile & upload stuff to the Raduino, I now have Ron's
mods running and he's fixed a lot of little annoying things (annoying
to me anyway).? In between bricking & fixing the rig (all firmware,
no hardware) I managed to make a couple of real nice 20 meter SSB
QSO's and also a couple of 40 meter CW QSO's as well with it.

I heard a lot of RTTY (contest this weekend) and sure wish there were
at least 5 more digital pins on the Nano.? Then it would really easy
to implement a good CW Keyer and even implement true FSK for RTTY.
You'd still need a computer with sound card running something like
Mako Mori's (JE1HHT) MMTTY program, but that would really work well.
Hardware FSK would be much cleaner to implement than tones into the
SSB section.? As wide as the filter is, I'd be wary of the 2nd and
maybe even 3rd harmonics of the tones being transmitted at the same
time as the fundamentals.? That would really create havoc on the
bands especially during a RTTY contest, not to mention incur the
wrath of the FCC as well.

Jim - W0EB

This little rig just keeps getting better and quite rapidly too!

Same here I didn't hear anything.
--
73, Yvon NU6I

I've been lobbying for an afternoon time for months now. A few of us got on at 3PM EST a month or so ago and made a number of contacts.

So if anyone can agree on a betting time I'm in.?
--
John - WA2FZW

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This is kinda? normal....the critical frequency (vertical 180 degree refraction) is dropping to 80 meters or BELOW right after dark over a lot of North America....traffic hounds in the north are having to use 160 meters at times....? ?

Cuba station checked into my WINLINK server in late afternoon on 40 meters --- 570 km south of me, great propagation.??

Australia has multiple web pages that show exactly how propgation is going and what frequencies will work for what distances, anywhere in the world, all based on radioionosonde data gathered from those stations scattered around the world.....

take a look at this web page:? ??

As I write this, the critical frequency for most of north america is TWO MEGAHERTZ.

If you're working a longer distances, the MUF will of course be higher than the CRITICAL FREQUENCY as glancing signals are much more easily refracted than straight-up-and-down ones, but this is all fairly well understood and available information now for all of us to use!

Cheers,

gordon

noticed same thing here up north since last fall. After grey line NOTHING! Local path only. I suggest earlier times - 4pm EDT - 2100 Z perhaps. Real hit and miss an evening net this time of year and crappy propagation. Thanks for trying. I usually listen on 7.277 during the day if I'm in the shack and not doing my "chores". Don't be afraid to call CQ anytime anywhere.

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?Ah!? ?From your QRZ page you have an ICOM 718 exactly like me.? ?

One additional question:? are you able to make small changes in the code of the firmware that you've downloaded? like minor edits?

And which VERSION of firmware are you using?

Cheers,

gordon

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?Can you give a little more information?

How far off?? Exactly how did you measure???

What did you do (give the details) when you tried "calibrating"??

Do you have accesss to an accurate existing receiver with a digital readout?

Cheers,

gordon