What size would you like to see for an Metal Box enclosure??? I started drawing with a 6" wide x 6" depth x 3" height?? So the front and back panel is 3" high, the flat bottom is 6" wide by 6" in depth.?? If you made it a little bigger, maybe include that small QRP chinese antenna tuner???? Space for a PSK31 Audio interface?? Or another Arduino Nano board to generate the PSK31 transmit audio from a USB interface??? Lets here ideas for what size to make a box and why it should be that size??? When files can be uploaded again,? I will put my first rough draft CAD file? here:? /g/BITX20/files/Enclosures_Metal_or_Plastic/Metal_Box_files

Creating a Metal Enclosure? using LibreCAD.org drawing, output file Autocad 2007 .DXF file.

For the moment,Feb 3, I can't upload any files to [email protected] ? Uploading the .DXF file and a README.TXT file would allow some one else to download and modify the CAD file for their needs.

Free Software for Windows / Linux / MAC / FreeBSD??

I made one folder for Metal Boxes that would use a CNC Plasma cutter from a .DXF file and a 2nd folder for Plastic Boxes, that you might use 3D printing to make.

Make, Hack, Modify and share around the world.

I plan to build a rectangle box enclosure with the holes already cut out.?? These boxes I make would be for sale.

I made this test CAD file using? 3/8 inch size holes.? If I could get some assistance in a very short message note, passing the diameter size of the hole back to me.

Then I can modify the drawing to match the parts that would be placed in that hole.?? Like MIC plug connector,? Head Phones connector,? Tuning Rotary hole,

On the back panel,? the power connector, the RF connector to the Antenna.?? Any extra holes for spare switches.

Give me a little hand or point me to the URLs on the web.?? I have the specs for the 16x2 LCD displaly.

Out of the junkbox came 33uf @25V radials..(5 for $1 @ALLELECTRONICS.COM)? I twisted the negatives together and made a 3 legged device, Tacked soldered it on the 3 legs of the 5v regulator. Center pin ground. minor key clicking can be heard when antenna disconnected. No key clicks while listening on my Windom @ 33ft. I also noticed tuning is "smoother". I am running Raduino v1.01. FYI---? I also considered a 1N4001 in series with the 12V to the DDS at the power switch on the back of the volume control to decouple DDS from main board.

de W8LM..KANSAS

I tried this thing:

Connect the 12V from the power input to the module input, adjust the pot for 20V to 24V at the output and connect your PA power connector to the output of the module.

There is an "Enable" pin which I did not use. The data sheet says it should be connected to GND in order to shut down the converter:

Did not measure the volatge drop when disabled, or if the module passes the input voltage to the output when disabled.

You will need about 1A at output so almost 2A at the input, which adds to your regular 0.5A currect draw of the rest of the board, so a 12V/3A power supply is required.

Good luck,

--

Ion

VA3NOI

To get a higher PA voltage using a DC booster what sort of power supply do you use?

Can you use an AC to DC plug pack? ?Say 16VDC at 3A or whatever?

Thanks - Noel

开云体育

Hello

Using my multimeter I worked out the pins on the stereo sockets I received.

Now when I plug in my stereo 3.5mm headphones in, the speaker shuts off.

I use a PC headset with mic and phones.

Each socket is exactly the same

Cheers - Noel

Disconnect the red wire coming to your Volume pot and connect it to AUDIO IN.

Connect a wire from AUDIO OUT to your Volume pot where the red wire was before.
--
Ion

VA3NOI

Yes, I have the same problem and it was present even before of the last night maintenence.

I created a folder but I cannot upload any file there.

I was planning to upload some documentation for components used in the design.
--
Ion

VA3NOI

Ricardo,

To calculate the frequency of a Clapp oscillator you should use the information found here:

Now, BitX is using a VFO that oscillates between, roughly 4.5 MHz to 5 MHz.

The C0 in the formula above is the combination of C96 in series with MV209 and those two in parallel with C93, C94 and C95.

The equivalent capacitance of a series of capacitors is calculated as follow:

C eq series = (C1 x C2)/(C1+C2)

The equivalent capacitance of a parallel group of capacitors is calculated as follow:

Ceq parallel = C1+C2+C3+C4

For our circuit C1=C93, C2=C94, C3=C95 and C4=(C96x MV209)/(C96+MV209)

The nominal value of the inductance is stated on the schematic: L4=9 uH, but with the capacitors as per schematic I am expecting more like a 6 uH inductance. I used that value for may calculations.

In my calculation, for the minimum VFO frequency, using the nominal values in the schematic, I ended up with a frequency range of 4.7MHz to 5 MHz, which looks consistent with a band coverage of 7 MHz to 7.3 MHz.

With all those in mind, I think the best option for you is to place a second varactor diode in parallel, add another NPO capacitor of 220 pF or 300 pF in parallel with C96 and verify the new frequency range of your VFO.

It calculates as 4.35 MHz to 4.85 MHz, or a band coverage of 7.65 MHz to 7.15 MHz for 220 pF.

Good luck,

--?

Ion

VA3NOI

Anyone else unable to upload a file ?? The option to upload has vanished so I cannot update the Tips n Mods docs in the files section.

I've tried logging out and back in but just the same.? I still have folder priviledges but not file upload.

Rob G4NQX