Date   
Re: Bitx40 All done

Sean Barton
 

When I did mine someone recommended using a wood chisel to make the cutout.  I got a set of cheap chisels from Harbor Freight and clamped the panel between a thick piece of steel as a sacrificial backing and a straight edge.  I laid the flat part of the chisel along the straight edge and started making a series of shallow cuts until I made it through the material.  I was a little off on my measurements but otherwise I think it turned out pretty well.

Sean
KB0OVD


On Friday, July 7, 2017 7:42 AM, Jack Purdum via Groups.Io <econjack@...> wrote:


I've used a fret saw, too, and it works pretty well. I draw an outline and use C clamps to hold a small metal bar on the line to prevent the saw from drifting outside the cutout. That and a little work with a file does pretty well. It's still nice to have a bezel though.

Jack, W8TEE



From: Raj vu2zap <rajendrakumargg@...>
To: BITX20@groups.io
Sent: Thursday, July 6, 2017 11:57 PM
Subject: Re: [BITX20] Bitx40 All done

I always drill 4 holes on the inside of the window lines and use a hand fret saw to cut the center out.
Then you need some elbow grease to make the hole neat.

Now if you can get a bezel for the display, then you are in business!

At 07/07/2017, you wrote:
>Aperture all within display outline, so a file and a bit of judicious 'elbow-grease' would cure any uglies. All those extras! Well done!







Virus-free. www.avast.com


Re: Field Day 2017

Brian D. K2BRZ
 

I operated with my RACES unit (NI2S) and had quite a few QRP contacts, but like you said none identified as BITX operators. It was a great weekend for it.

Brian D.
K2BRZ

Re: Bitx40 All done

Jack Purdum <econjack@...>
 

I've used a fret saw, too, and it works pretty well. I draw an outline and use C clamps to hold a small metal bar on the line to prevent the saw from drifting outside the cutout. That and a little work with a file does pretty well. It's still nice to have a bezel though.

Jack, W8TEE



From: Raj vu2zap <rajendrakumargg@...>
To: BITX20@groups.io
Sent: Thursday, July 6, 2017 11:57 PM
Subject: Re: [BITX20] Bitx40 All done

I always drill 4 holes on the inside of the window lines and use a hand fret saw to cut the center out.
Then you need some elbow grease to make the hole neat.

Now if you can get a bezel for the display, then you are in business!

At 07/07/2017, you wrote:
>Aperture all within display outline, so a file and a bit of judicious 'elbow-grease' would cure any uglies. All those extras! Well done!







Virus-free. www.avast.com

Re: Bitx40 All done

Vince Vielhaber
 

I used to have that same nibbler, a couple of them in fact. Don't nibble
anything too heavy, that's where both of mine went!

When I cut the hole for mine I used a 1/8" endmill in a milling machine.
If I didn't, any other method would have resulted in a very wavy line.

Vince.

Nice job getting all that stuff on the panel! I put the mic, phone and key
jacks on the side of my box to save space on the front panel for future
additions.

Here's the answer to making neat square holes like for the display. (
http://www.jameco.com/z/HT-204-R-Hanlong-Tools-Nibbling-Tool-for-Sheet-Metal_18810.html?CID=GOOG&gclid=EAIaIQobChMI8sCWgJb21AIVkVcNCh11EwnKEAQYAiABEgIHU_D_BwE
) I can't vouch for how good that particular one is, however. I have an
Adel nibbler ( http://www.adelnibbler.com/ ) . I've had it forever, They
want $55 for it now. I know I didn't pay that much a hundred years ago
when I bought one.

Re: Bitx40 All done

lostfrogsrecords <dave@...>
 

I 3D printed a bezel to hid my similar workmanship..  I have attached the .stl file I used.
I could print one for you if you would like.
Dave, KI4PSR


.

Re: BITX40 Microphone options

terry hughes
 

i have done the same. the supplied mike insert fits into a tube from a marker pen

terry

80m hexfet power amplifier by W7ZOI

Daniel Isaza
 

Hi All,

Does anyone have built this little marvel? Any thoughts? I'm guessing the only mod(s) needed to move it to 40m is the LPF and maybe L1, am I right?

Gonna get another 12V battery ASAP.



found it here:
http://www.qsl.net/yo5ofh/projects/ham%20radio%20projects.htm

73,
Dan
HK4DEI

Re: Bitx40 All done

 

Used a combo of Drill press and punch with some files. I need to get a saw even a nice small metal hand saw. It was all a squeeze for sure AGC is going to be tough hihi

Re: Bitx40 All done

 

I always drill 4 holes on the inside of the window lines and use a hand fret saw to cut the center out.
Then you need some elbow grease to make the hole neat.

Now if you can get a bezel for the display, then you are in business!

At 07/07/2017, you wrote:
Aperture all within display outline, so a file and a bit of judicious 'elbow-grease' would cure any uglies. All those extras! Well done!

Re: Bitx40 All done

Dexter N Muir
 

Aperture all within display outline, so a file and a bit of judicious 'elbow-grease' would cure any uglies. All those extras! Well done!

Re: Bitx40 All done

John P
 

Nice job getting all that stuff on the panel! I put the mic, phone and key jacks on the side of my box to save space on the front panel for future additions.

Here's the answer to making neat square holes like for the display. I can't vouch for how good that particular one is, however. I have an Adel nibbler. I've had it forever, They want $55 for it now. I know I didn't pay that much a hundred years ago when I bought one.


--
John - WA2FZW

Re: VK and ZL group buy of Jack W8TEE VFO boards

William R Maxwell
 

Whoops! Sorry, that wasn't intended for the group, just Martin.

Bill, VK7MX


On 7/07/2017 12:38 PM, Bill Maxwell wrote:

G'Day Martin

Jack W8TEE's VFO boards arrived from the USA yesterday. I bought 15 boards from him and have therefore divided my total costs to date by 15, yielding a landed price per board of $12.30.

Went to the Post Office this morning to check packaging costs and postage. The boards are a touch bigger than I would be comfortable about simply putting in a normal envelope, as I suspect they may well punch through the ends of the envelope and might actually escape. A normal envelope also offers little protection to the pcb traces etc.

My preferred package is the stiff cardboard AusPost disk or photo mailer, at $1.30. Then there is actual postage of either 1 or 2 boards anywhere in Australia at  $2.00.

Total cost  for 2 boards posted to you would therefore be $27.90.

I can accept payment by Paypal using the wrmaxwell@... email address, or by direct deposit to BSB 814282, Account 10234433, W R Maxwell.

If paying by Paypal please send the money as a gift, but being sure to include your postal address in the "notes" section. I am only seeking to recover my actual costs in this exercise, as my contribution to supporting the BITX 40 project. I have not factored any Paypal charges or commission into these costings, so please don't use the "purchasing goods or services" Paypal option, as that would put me out of pocket.

Of the 15 boards received, I am keeping 2 for my use. I have reservations for a further 9. Once I hear back from you and the others on the list, I will advertidse whatever boards remain on the BITX group.

73

Bill, VK7MX


On 12/06/2017 10:48 AM, martin Fraser wrote:
Count me in on 2 please

Regards martin 
VK6FEEE


Re: VK and ZL group buy of Jack W8TEE VFO boards

William R Maxwell
 

G'Day Martin

Jack W8TEE's VFO boards arrived from the USA yesterday. I bought 15 boards from him and have therefore divided my total costs to date by 15, yielding a landed price per board of $12.30.

Went to the Post Office this morning to check packaging costs and postage. The boards are a touch bigger than I would be comfortable about simply putting in a normal envelope, as I suspect they may well punch through the ends of the envelope and might actually escape. A normal envelope also offers little protection to the pcb traces etc.

My preferred package is the stiff cardboard AusPost disk or photo mailer, at $1.30. Then there is actual postage of either 1 or 2 boards anywhere in Australia at  $2.00.

Total cost  for 2 boards posted to you would therefore be $27.90.

I can accept payment by Paypal using the wrmaxwell@... email address, or by direct deposit to BSB 814282, Account 10234433, W R Maxwell.

If paying by Paypal please send the money as a gift, but being sure to include your postal address in the "notes" section. I am only seeking to recover my actual costs in this exercise, as my contribution to supporting the BITX 40 project. I have not factored any Paypal charges or commission into these costings, so please don't use the "purchasing goods or services" Paypal option, as that would put me out of pocket.

Of the 15 boards received, I am keeping 2 for my use. I have reservations for a further 9. Once I hear back from you and the others on the list, I will advertidse whatever boards remain on the BITX group.

73

Bill, VK7MX


On 12/06/2017 10:48 AM, martin Fraser wrote:
Count me in on 2 please

Regards martin 
VK6FEEE

Bitx40 All done

 

It's done took a few days of mods and hole drilling still have to work on my LCD display cutting in .....as you can see not so good at it yet hihi.

In total it has an added Keyer, Nescaf Filter and zero beat, soon AGC once I either build one or get a few boards.

From left to right FS // CW FS // Nescaf Filter Center // Nescaf Filter Bandwidth // Nescaf On/Off // Vol // Head Phones // Mic.

Above the mic and phones is the zero beat and the led for it is the yellow one above left of the tune lower right of tune is nescaf led. The zero beat is not the built in one but a LED version based off a 567 tone detector, I have built a few and love them.

All in all it was a fun build and can't wait for some park ops.

73

 Happy Building

 

 David

 N8DAH

Re: BITX40 Sensitivity

Peter Parker
 

Rather than concentrating on a number, I'd be testing at what is required for your area (largely dictated by ambient noise level). 

That is your rig should be very quiet with no antenna connected and the volume turned up (it should be free of whine or hash from the DDS VFO).  

Connecting an antenna should lead to a significant increase in noise. If there is there's enough gain. If there isn't there's not enough gain. It's as simple as that. 

And any remaining synthesiser noise should be completely smothered by RF noise pick up. 

If you're really critical take your Bitx to a quiet location.  There have been cases where I thought one had adequate sensitivity in my noisy home QTH but was plagued with synthesiser noise away from home. 

Repeat the antenna disconnect/connect test there.  Then you'll truly find if the sensitivity is enough or not. 

Here's what one can sound like at such an RF quiet location. https://www.youtube.com/watch?v=9n_QYo6yyd0

Re: dipole antenna changes, big improvement

KC8WBK
 

I raised it up yesterday.  It is fed with coax.

Re: BITX40 Sensitivity

Sandeep Lohia
 

 Low pass filter in BITX works best with 50 ohm input, otherwise sensitivity will suffer...

With long or short wire I always had to retouch my BPF...

On Jul 7, 2017 1:15 AM, "Sandeep Lohia" <sandeeplohia12@...> wrote:
One need to retune ( 27 pf variable trimmer + one air wound LPF coil )
 BPF if antenna is not 50 ohm, long wire is not 50 ohm...
was talking about old 2.2uh inductors, 

Didn't tested 6 uh inductance BPF yet...

On Jul 5, 2017 7:36 PM, "Larry Acklin" <acklin@...> wrote:
YEP!  Had a QSO with a guy in Alabama, he was running 500W, I was running 5W.  20M SSB.

Says a lot- my rig probably cost less than his microphone.
($65 for a Bitx20 V3SBL1 and a junked SSB CB for the crystal filter)

73
Larry
KB3CUF

On Wed, Jul 5, 2017 at 9:31 AM, Raj vu2zap <rajendrakumargg@...> wrote:
The term I heard is "alligators"!

Very big mouth and small ears!

IMHO high power is useful in controlling a pileup or in bad condition skeds!

Raj, vu2zap

At 05/07/2017, you wrote:
>I have a much simpler test for sensitivity. I have done careful research and decided that there are a lot more stations that I can hear than stations that can hear me! I wish the folks running the kilowatt transmitters would pay as much attention to the capabilities of their receivers (and ears) as they do to their transmitters.  OK, I'll get off the soapbox now!
>--
>John - WA2FZW






Re: BITX40 Sensitivity

Sandeep Lohia
 

One need to retune ( 27 pf variable trimmer + one air wound LPF coil )
 BPF if antenna is not 50 ohm, long wire is not 50 ohm...
was talking about old 2.2uh inductors, 

Didn't tested 6 uh inductance BPF yet...

On Jul 5, 2017 7:36 PM, "Larry Acklin" <acklin@...> wrote:
YEP!  Had a QSO with a guy in Alabama, he was running 500W, I was running 5W.  20M SSB.

Says a lot- my rig probably cost less than his microphone.
($65 for a Bitx20 V3SBL1 and a junked SSB CB for the crystal filter)

73
Larry
KB3CUF

On Wed, Jul 5, 2017 at 9:31 AM, Raj vu2zap <rajendrakumargg@...> wrote:
The term I heard is "alligators"!

Very big mouth and small ears!

IMHO high power is useful in controlling a pileup or in bad condition skeds!

Raj, vu2zap

At 05/07/2017, you wrote:
>I have a much simpler test for sensitivity. I have done careful research and decided that there are a lot more stations that I can hear than stations that can hear me! I wish the folks running the kilowatt transmitters would pay as much attention to the capabilities of their receivers (and ears) as they do to their transmitters.  OK, I'll get off the soapbox now!
>--
>John - WA2FZW





Re: what distance have you logged

peatmoss - ki6ssi
 

For SSB about 1980 miles to KL7CWN with 5w and 80 meter ocf dipole at about 25 feet. On wspr I logged AU at 9246 miles. 

Re: A Good Book

Baruch Atta <baruchatta@...>
 

A very good site, kits, tings to build, and books to download.


Just a note on this file.  NOWHERE IN THE FILE is the name of the book mentioned!!!!  I hadda write to ARRL to find out the name of the book.  I bought the book.  Now, I have little time to read it!
Joe W3TTT


Chapter ONE of Experimental Methods in RF Design (EMRFD) is available at:

http://www.arrl.org/files/file/Product%20Notes/chapter_1.pdf



--
73, Joe W3TTT