Date   
Re: Need 12.000 MHz crystals for the BITX40 #bitx40help #bitx40

MadRadioModder
 

You can also use variable capacitors… or better yet varactor diodes to change the bandwidth electrically a bit:

 

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of KM4TRT via Groups.Io
Sent: Sunday, October 28, 2018 10:59 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Need 12.000 MHz crystals for the BITX40 #bitx40 #bitx40help

 

I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .  50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.  It's a little tight if anything.

Andy KM4TRT


Virus-free. www.avg.com

--

…_. _._

Re: ubitx keyer

Curt
 

Luigi

I am a new ubitx user, and if you are using the stock firmware code that is initially delivered, maybe I know what you are referring to. There is a long initial delay transitioning to cw transmit when using a straight key. I have gotten used to it. Problem I have is if I place a long pause between characters,  it throws me off when the relay status comes out of transmit. while this delay has programable settings, it was even worse when I selected the shorter option. Sure I will try alternative firmware, but this likely can't offset the hardware.

Curt

Re: VK4PP uBitx LPF BANK add-on Board

KM4TRT
 

Hi Nick,
Put me down for a production board
Andy KM4TRT

Re: Need 12.000 MHz crystals for the BITX40 #bitx40help #bitx40

KM4TRT
 

I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .  50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.  It's a little tight if anything.

Andy KM4TRT

Re: ubitx keyer

Jack, W8TEE
 

Whose code are you using?

Jack, W8TEE

On Sunday, October 28, 2018, 11:04:25 AM EDT, i4awxab1fj@... <i4awxab1fj@...> wrote:


I experience a delay between dots and dashes except at very low speeds which makes keying somehow erratic. Any cure for this? (Voltages for dots and dashes are correct).
Thanks,
73
I4awx Luigi 

Re: ubitx keyer

i4awxab1fj@...
 

I experience a delay between dots and dashes except at very low speeds which makes keying somehow erratic. Any cure for this? (Voltages for dots and dashes are correct).
Thanks,
73
I4awx Luigi 

Re: Dummy Load Resistors

Jack, W8TEE
 

Great idea! Seeing others experiment with µC's in projects is terrific!

Jack, W8TEE

On Sunday, October 28, 2018, 7:38:35 AM EDT, Dennis Zabawa <kg4rul@...> wrote:


Another path to take, if you already have a 50 ohm dummy load, is to use that instead.  You will need to calibrate the system in that case.

I am working on a version of the DDL using a SparkFun, Microview module in place of the Arduino board and display and an MFJ, 300W Dry Dummy Load.  I am also adding a Peak power function to the sketch and a bootup option to enter the reference power reading and have the system self-calibrate.  It is in the 'breadboard' stage at this time and I will post the code, etc. when I have packaged it up and tested it in that form.

Dennis KG4RUL

Instructions on assembling VU3SUA kit

John
 

I'm working on assembling/integrating the uBitX into this enclosure. I've searched with Dr Google but can only find a video that describes assembly and interconnect of the various sub boards that come with this nice enclosure.

Is there a more step by step guide or schematics to be had? If so , my google Fu must be faulty

73
John k5mo

Re: Dummy Load Resistors

Dennis Zabawa
 

Another path to take, if you already have a 50 ohm dummy load, is to use that instead.  You will need to calibrate the system in that case.

I am working on a version of the DDL using a SparkFun, Microview module in place of the Arduino board and display and an MFJ, 300W Dry Dummy Load.  I am also adding a Peak power function to the sketch and a bootup option to enter the reference power reading and have the system self-calibrate.  It is in the 'breadboard' stage at this time and I will post the code, etc. when I have packaged it up and tested it in that form.

Dennis KG4RUL

Re: QSX 10W HF Linear PA kit

 

I use a indelible marker to color the leads.

You can use an inductance meter to check, the higher one will be 3T ..

Raj

At 28-10-18, you wrote:
Hello from the rapidly warming and drying out downunder.

I have got as far as winding the transformers and installing them. My method for remembering which was the three turn and which was the two turn winding of T204 was to leave the tails of the three turn winding appreciably longer than the tails of the two turn winding. Now I have this transformer in my left hand, it has two windings, one has longer tails than the other. Now is it the three turn or the two turn winding? I should have written it down!

I have to comment on the excellent quality of the assembly manual. Well done and thanks, Hans!

vy 73 all.
Kevin VK3DAP / ZL2DAP

Re: QSX 10W HF Linear PA kit

Kevin Luxford
 

Hello from the rapidly warming and drying out downunder.

I have got as far as winding the transformers and installing them. My method for remembering which was the three turn and which was the two turn winding of T204 was to leave the tails of the three turn winding appreciably longer than the tails of the two turn winding. Now I have this transformer in my left hand, it has two windings, one has longer tails than the other. Now is it the three turn or the two turn winding? I should have written it down!

I have to comment on the excellent quality of the assembly manual. Well done and thanks, Hans!

vy 73 all.
Kevin VK3DAP / ZL2DAP

--
Kevin B. G. Luxford
kbgluxford@...

Re: Dummy Load Resistors

Jerry Gaffke
 

Mouser has 2,837 of the 1k 3W Xicon in stock, item number 283-1.0K-RC

They don't really have to be 1k, there are plenty of other choices.
For example, get the same part at 1.2 k, item 283-1.2K-RC
and use 1200/50 = 24 of them in parallel instead of 20.

If all you ever expect to feed it is 18 watts or so, maybe use 300/50 = 6 of   283-300-RC
You wouldn't even need that oil bath, just good air flow.

Other values that might  be of interest:  51  100 150 200 300 510 750

Jerry, KE7ER



On Sat, Oct 27, 2018 at 07:53 PM, Jack Purdum wrote:
A number of you have written me privately saying you're having trouble finding the 1K 3W resistors for the dummy load project (Nov., 2018, QST).

Dummy Load Resistors

Jack, W8TEE
 

All:

A number of you have written me privately saying you're having trouble finding the 1K 3W resistors for the dummy load project (Nov., 2018, QST). If you don't have access to QST, you can download the assembly manual from our site:


Evidently, some eBay suppliers say they have them, but the order quickly becomes a back order. Check before you order. Someone just wrote to me and said Arrow carries them:

https://www.arrow.com/en/products/mos3ct631r102j/koa-speer-electronics

but they are saying a December delivery. I bought mine from Rich at communications-lab.com:


You may want to write first, as he was moving his business to HI when we last spoke. Also, if you know that you're always going to be using QRP power levels, you could cut back on the wattage and that should make them easier to find (and cheaper).


Jack, W8TEE

Re: Nextion Basic 3.2 Display will not update #ubitx

Vince Vielhaber
 

I'm replying to an old post, much of it was about SD cards with the Nextion displays (for those that use email, not the web). 

I got a 4.3" Nextion Enhanced display for a non-bitx project and tried HC and HC-I SD cards to get it to load the firmware.  All of the attempts were made formatting the cards as VFAT32 from Linux, all were dismal failures.

What I finally had to do was format one in my wife's laptop (long format) to get it to recognize it as VFAT32.  Also what I did to avoid having to format it like that again was to use dd and make an image of the blank, formatted card.

The first one I tried to use was just an HC.  No go. The display still didn't like it. The second one was an HC-I card.  That one worked.  Also that one was formatted using the above mentioned image. 

I hope this helps someone else that may encounter similar problems.

Vince - K8ZW (using the group's web interface)

Re: QSX 10W HF Linear PA kit

ajparent1/kb1gmx
 

Having built a few already RTFM is valid.  It is compact so take time and check everything.

Allison

Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats

Michael Shreeve
 

Thanks for telling me about the DX contest and that 15 was opened. Just got D4C , MonteVerde , which seems to be off the coast of Africa, an Island ? 5 watts, uBITX !  80 meter loop with an antenna tuner ? No, not possible. can't be. Love Solder Smoke. Trying to get people to listen as they travel. 

Re: Nervous #ubitx-help

Ruarto <rhgalyan@...>
 

Thanks.   I will try that.   Im not 80 yet,  just 76,  but eyes and shakes etc seem 100.

 

 

Sent from Mail for Windows 10

 

From: Michael Shreeve
Sent: Saturday, October 27, 2018 11:46 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nervous #ubitx-help

 

Yes, I'd say its the soldering that's pretty much the only challenge. I have one friend whos in his 80s and he is challenged by soldering now. Couple of things, 1 is shaking. The way to be successful if you shake is, wrap the wires your trying to solder, do not "tack" the wires together or try to. Do not TACK wirer to connections on jacks or plugs. Wrap the wire first. 2 . Use the best magnifying glass you can get, one with a table mount, those spring mounted ones that are cheap now on Ebay. They used to use Fluorescents, not they use led lighting and are light weight. I even took a ring mount light and put it on a large magnifying lens handheld,  that had a handle and used to have batteries in the handle and an incandescent flashlight bulb for light. Upgraded it, love it. Magnification and lighting will extend your construction activities tremendously, especially, generally, if your older and have those old eyes that require reading glasses ? VERY COMMON, not to worry !

 

Re: Mike element

Frank Dinger , EI7KS
 

Chinese on-line retailers sell electrets with external amplifier on a 15x20mm board complete with separate 5 pin header.  This unit seem to be very effective for BITX radios.  Past week  I received 2 pcs .

Frank  ,  EI7KS

Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats

Michael Shreeve
 

Thanks for posting that, something to listen to. 1000 watt ubitx all band. LOL

Re: Nervous #ubitx-help

Michael Shreeve
 

Yes, I'd say its the soldering that's pretty much the only challenge. I have one friend whos in his 80s and he is challenged by soldering now. Couple of things, 1 is shaking. The way to be successful if you shake is, wrap the wires your trying to solder, do not "tack" the wires together or try to. Do not TACK wirer to connections on jacks or plugs. Wrap the wire first. 2 . Use the best magnifying glass you can get, one with a table mount, those spring mounted ones that are cheap now on Ebay. They used to use Fluorescents, not they use led lighting and are light weight. I even took a ring mount light and put it on a large magnifying lens handheld,  that had a handle and used to have batteries in the handle and an incandescent flashlight bulb for light. Upgraded it, love it. Magnification and lighting will extend your construction activities tremendously, especially, generally, if your older and have those old eyes that require reading glasses ? VERY COMMON, not to worry !