Date   
BitX40 case from The Home Depot...

Steve
 

I picked up this Husky clear acrylic "waterproof" case from THD back when I first got my '40.  $12.  I kind of like the see-through look.  I think with some rearranging I could get a small LiPo battery in there....The Sharpie pen case made a dandy mic body.  Could probably squeeze a bit of wire in there for a dipole or End Fed, then I'd truly have a shack in a box.  The little speaker in there is practically useless.  Probably leave it as-is, and move on the the uBitx.  Aloha, Steve.  
ps- made a contact on a (questionably-accurate) indicated 3.5W to Alaska.  Stoked!

I've gone digital with the BitX-40!

John P
 

Just got the BitX-40 working on FT-8 2 days ago! So far, I've worked 12 states (AL, AZ, GA, IL, MI, MS, NC, NJ, OH, VA, WA, WV) and Ontario. Not bad for only 5 watts!

I've seen W1LY on FT-8, but have yet to work him. Anyone else on here using FT-8 on the BitX? Look for me or let me know you're on and I'll look for you.

In a couple of days, I'll publish the VOX operated interface I'm using between the PC and the rig.
--
John - WA2FZW

Re: I've gone digital with the BitX-40!

 

That's pretty impressive John ! What is your antenna setup?

Re: How To Do a Search for Specific Message

Jerry Gaffke
 

I first select a specific message at random, your message will do:
    https://groups.io/g/BITX20/message/44837
Then edit that number (44837) to whatever message number I want to see.

Jerry, KE7ER


On Sat, Mar 17, 2018 at 06:46 pm, Guy N7BIR wrote:
I think I’m getting dumber the older I get but I can’t figure out how to search for specific messages in our Group List. Putting the pound sign in front doesn’t seem to work, and just putting the message number in doesn’t help. Any Search gurus out there?

Re: RD16HHF1 power curve flattening...some

Glenn
 

Nik,

I have done  a bit more testing now using an RD16HHF1 pair in the final although expediency meant i used the final section of the G6ALU 20W pa design.

I also found oscillation problem (about 110MHz). It seemed to be coming from the 1st and maybe the 2nd stages of the MPSH10 stages.  I removed the 330pF from the 1st stage and it's now pretty tame.  BUT, the response is nothing like as flat as I had hoped it would be. I have no feedback on the RD16HHF1 stages as yet.  I don't run the drive control flat output though as looking at the output on a scope, it's severely flat topping with this level. Around 16-17W is about max. level.

 But I did plot the response of an original complete G6ALU amp and it falls away badly at the 80M end of the HF bands. In the PicaStar where this pa is used, it's no problem as Star has software drive control on each band since its DSP based.

Not much time to investigate further at this stage.

glenn
vk3pe


MSG:
Well, i have dont my mods and powered up. Results are mixed:
Here are the mods.
RD16 replace IRF510.
New output transformer 1:4 BN43-3321 with a 330pf cap on input.
feed back resistors. from 22ohm to 1 K ohm
piggy backed R87 and R88 with 220pf capacitor.
RV1 full drive.

So results.
80M - 20W + ( blew my 2 Amp fuse)
40M - 18W - Seems stable.
30M - 17W BUT I get BAD feedback/ oscillation by just going PPT with no voice. The watt meter goes up to 18W!
20M - 15W  -  Same feedback issue
15M -  Same feedback issue.
10M -  Same feedback issue.

I have been thinking ans looking at other RD16 schematics, in alot of cases they dont use the feedback on the finals?
Also could this issue be cuase in the driver stage?

THanks guys, I am in over my head here....

73
10M - Same feedback issue

Re: adrino

David Wilcox
 

Keep us posted on your progress and the value.  I ordered one too after the first email.

Dave K8WPE

On Mar 17, 2018, at 8:41 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

Which starter kit?

Having recommended this kit, figured I might as well get one.  Arrived today:
        https://www.amazon.com/Elegoo-Project-Starter-Arduino-Mega2560/dp/B01GEEWIPA

Haven't played with it yet, but have inspected the box contents.
Impressive!  It all looks quite useful.
You'd be hard pressed to buy all the stuff they give you for the same $30.

The next even mildly interested young relative or acquaintance of mine may well get one.
But not this one, I think I'll keep it.

Jerry

On Sat, Mar 17, 2018 at 04:58 pm, @bobbybailey wrote:
today I got the book and the starter kit, so far I have learned to save, compile and edit the blink sketch.

Re: BitX40 case from The Home Depot...

Jacob Farnes
 

What is the panel material you are using and how did you mount the mounting screws?

I am looking to do similar to some ammo cans and the Apache cases. I've been having a rough time getting something sturdier than cookie tins. Apparently I'm a little too rough for them.

Re: uBitx Component list

Noel-ZR6DX
 

HI Alan,  email me and I will send you a BOM file in Excel format . I will also need to email you the circuit diagram as my component annotation is not the same as the original circuit from Ashhar.   I run a youth club called Hammies ZS6ZU and I have designed a PCB for THT components. We have populated two PCB's and are busy with the testing phase. The idea here, is to get the kids to build their own transceiver using though hole components.

73
Noel de ZR6DX

Re: I've gone digital with the BitX-40!

John P
 

On Sat, Mar 17, 2018 at 10:33 pm, Don N9GOD wrote:
What is your antenna setup?
The antenna is a 2 turn - 4 foot magnetic loop in the attic. The documentation and software for the controller is in the "Files" section here.
 
--
John - WA2FZW

Re: Received my uBitx!

W8SWG
 

Per suggestion here I did email hfsigs.  They informed me today that they have shipped united with order dates of 1/24.  Could it be that John meant that he placed his order on 1/17 rather than 2/17? 

Re: adrino

Terry Morris
 

That's the one I ordered.


Terry - KB8AMZ
Brimfield Twp, OH
Linux User#412308, Ubuntu User #34905
OSs: LM18.1, Ubuntu 16.04, Puppy tahrpup64, Raspbian
Orgs: PCL70-FOP, NTHS, ALUG, ARRL, PCARS#78, NAQCC#6668, NO-QRP-C, QRP-ARCI#8855
I chair the PCARS CW/QRP SIG and Linux for Hams SIG, second and fifth Tuesday

my computer, my opinion

On Sat, Mar 17, 2018 at 10:04 PM, <wb7dmx@...> wrote:
super starter kit r3


Re: Junkyard uBITX #ubitx

Terry Morris
 

Nice kit.


Terry - KB8AMZ
Brimfield Twp, OH
Linux User#412308, Ubuntu User #34905
OSs: LM18.1, Ubuntu 16.04, Puppy tahrpup64, Raspbian
Orgs: PCL70-FOP, NTHS, ALUG, ARRL, PCARS#78, NAQCC#6668, NO-QRP-C, QRP-ARCI#8855
I chair the PCARS CW/QRP SIG and Linux for Hams SIG, second and fifth Tuesday

my computer, my opinion

On Sat, Mar 17, 2018 at 11:10 PM, Gordon Gibby <ggibby@...> wrote:
Rob:  looks beautimus!!


On Mar 17, 2018, at 22:07, Rob Snow <rsnow@...> wrote:

I've seen a ton of beautiful uBITX builds, I thought I'd add my junkyard build that I just completed earlier for the other end of the spectrum.  My wife was going to throw the tin away, so I grabbed it.  Some drilling and snips later and it is alive!  I've got the WX audio chip, so I installed a 8ohm + 8ohm speaker and am running it at 12.0v from 13.8v with a step down that is pictured.

Tried some 80m and 40m earlier, but it's pretty horrible tonight.  I could hear a few folks, but no response to CQ so far.

<2018_03_17 20.25.55.jpg>

73
Rob
AG5OV


Re: Voltage/Waveform chart?

Paul Galburt - K2AYZ
 

I remember having a Wen soldering gun around 1954 as a Weller was too expensive for my 13 year old budget.

Re: Finally finished boxing up my uBitX #ubitx

John McClun
 

Since it's an SMD 2822 you might want to get a NJM2073M-TE1 which is the SMD compatable.
--
John
NQ3RP

Re: adrino

Fred Buecker
 

I have had some great experiences with the RexQualis kits. My daughter and I actually found some errors in the docs and they sent us an upgraded kit as a thank you for reporting the errors.

It was an unexpected, but welcome, gesture.

-Fred

KC3HMS

On Mar 18, 2018 10:00 AM, "Terry Morris" <terry.kb8amz@...> wrote:
That's the one I ordered.


Terry - KB8AMZ
Brimfield Twp, OH
Linux User#412308, Ubuntu User #34905
OSs: LM18.1, Ubuntu 16.04, Puppy tahrpup64, Raspbian
Orgs: PCL70-FOP, NTHS, ALUG, ARRL, PCARS#78, NAQCC#6668, NO-QRP-C, QRP-ARCI#8855
I chair the PCARS CW/QRP SIG and Linux for Hams SIG, second and fifth Tuesday

my computer, my opinion

On Sat, Mar 17, 2018 at 10:04 PM, <wb7dmx@...> wrote:
super starter kit r3


antenna tuner for uBitx

vu3jyt
 

what type of antenna tuner required for uBITX as it has only 10wpower
regards,

Re: antenna tuner for uBitx

Michael Luft
 

what type of antenna tuner required for uBITX as it has only 10wpower
regards,
VU3JYT, Rajan

Impedance matching is important if one wishes to deliver all TX power to the antenna and prevent  final stage to be overheated due to standing waves reflected from the mismatched antenna (load).
Matching the antenna also improves the ability of the RX to receive all the weak signals and nothing is wasted as heat.
Mike
4X1LM   

Re: antenna tuner for uBitx

Arv Evans
 

The type of antenna tuner depends on the type of antenna.  L-network for end-fed
or high impedance antennas.  T-network for medium to low impedance antenna.
Pi-network for dipoles.  It is unfortunate that specifications for ATU's usually do not
include the adjustable impedance range for each band that they cover.

http://www.arrl.org/how-antennas-work

Arv  K7HKL
_._


On Sun, Mar 18, 2018 at 9:25 AM, Michael Luft <milu111@...> wrote:
what type of antenna tuner required for uBITX as it has only 10wpower
regards,
VU3JYT, Rajan

Impedance matching is important if one wishes to deliver all TX power to the antenna and prevent  final stage to be overheated due to standing waves reflected from the mismatched antenna (load).
Matching the antenna also improves the ability of the RX to receive all the weak signals and nothing is wasted as heat.
Mike
4X1LM   


BITX40, are these SA traces as they should be? #bitx40help

Dieter ON4DD Vansteenwegen
 

Hi all,

Built my Bitx40, mostly to learn more about troubleshooting radios. I know a bit about measuring and how things "work" but just from reading theory. Practice is clearly different, and a good way to actually get some understanding.
As a result, my setup and measurements may be flawed from the beginning, though I try to do things the "right" way.

As I didn't receive much when trying to listen to the Bitx40 on my TS-870, I started looking at the schematic and trying to figure out what was going on.

Measurement setup:
Bitx40 through 20dB attenuator into a SA. VFO/DDS frequency set at 7110 kHz, no modulation into the microphone (shorted the pins) except for the screenshot with the 10kHz span.

In the 2MHz span, note the strongest peak is at -12dBm around 7333 kHz.
There's another peak around -18dBm at 7110 kHz (which I suppose is the DDS)
Another peak at 7555 kHz, about -41dBm.

In a 10MHz span, I see peaks at 14.218 kHz (-78dBm, obviously harmonic of DDS freq, right?) and 14.445 kHz (-68 dBm, no idea where this comes from).

I don't have a audio freq generator, will build one to inject a know signal into the mic input.

So, a couple of questions:
  1. As the tranceiver uses SSB, shouldn't the carrier be much more suppressed? Ideally, no carrier?
  2. Is the strong peak at 7333 supposed to be there? That's +6dBc, correct?
  3. What's with the 14445kHz peak? There's no peak at/around 7222 kHz...
  4. If I inject a 1kHz signal into the microphone input, what kind of voltage RMS should I use?
  5. A 1kHz on the input should show up as a 7109 kHz signal, is that correct? I tried some "steady" whistling and got a peak at -8 dBc at 7108.4 kHz and another at 7112.1 around -45 dBc (see the 10kHz span screenshot)
  6. In the 10 kHz whistling screenshot, I suppose the signal (result of the whistling) is at 7108.4 kHz, but -8 dBc. Shouldn't this be much more?

I might be missing something obvious, but have been looking a it for a couple of evenings now.

Thank you,

Dieter
ON4DD

Re: BitX40 case from The Home Depot...

Steve
 

The white panel was cut from a retail advertising sign.  Some kind of "plexiglas", but quite flexible and easy to work and cut- doesn't have a propensity to chip or shatter.  About 3mm thick- I had to countersink the holes where the jacks fit so the nuts would attach.  The brass mounting screws are just ACE hardware stock, with the knurled nuts.  I first tried to attach them with epoxy glue, but that didn't stay bonded to the acrylic case.  Currently, they are affixed with a healthy blob of 3M 5200 polyurethane sealant which is great stuff.  Besides holding the screws solidly, it allows for a small amount of flex, which, I suppose, adds a anti-shock component to the build....This is smaller and much lighter than an ammo can (steel anyway).  Not sure of the RF-resistant properties of acrylic.....;^)  Aloha, Steve.

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