A few years back I did a dummy load in much the same fashion Jack did, but using ten pieces, 510 ohm, 2 W resistors. Used flat copper flashing strips instead of wired to mount the resistors. Intended for QRP.

I used a 1/2 pint paint can from Ace Hardware. Poured the paint into an olive jar for later use and cleaned out the can.
Named it "Cantennino" - little cantenna ?? - as homage to Heathkit

For 10W and under, there was no need to use the oil fill.

Jack's detector and Arduino system should work just as nicely on the smaller load.

N5IB

Appreciate the input.
Similar output from the computer audio output compared to my microphone. Most of my contacts have been with FT8. Keep looking at it and can't figure out why 20V and 24v outputs are low.
I would love to have 20 watts out....

Jack,
I haven't built your dummy load but figured I would take a shot at recreating the panel to help out those that need it.
A few more dimensions would be very helpful.

• thickness of panel
• height, thickness and outside dimensions of reinforcing lip around perimeter of panel
• diameter of corner screw holes and distance between center of holes, both horizontal and vertical spacing
• diameter of switch opening
• was this designed for a specific enclosure?? if I can find the enclosure dimensions online it would answer some of these questions.

I am not currently an ARRL member so I may be asking questions that you covered in the article.

This is normally where I would go on a very long rant about imperial units but I'll skip it :)

The picture is about as far as my skills take it without the other dimensions.? As I have stated many times I am far from a skilled designer so if anyone is following this that actually knows what they are doing I will happily send what I have so far and of course plan on sharing the final file if I get that far.

--

All:

A number of you have written for the 3D printing file for the dummy load that is featured in the Nov issue of QST. Al designed it and it was not sent to QST, but should have been. Al had a system crash last week and cannot find the STL file for the case...yet. He's pretty sure he has it backed up, but has not found it. In the interim, for those who have some 3D design talent, this might help:



A -- panel width 3"
B -- panel height 2.5"
C -- distance between vertical support for 9V battery, between lip and support? 5/8"
D -- recess for OLED display: 1 3/16"
E -- distance between bottom of OLED opening and recess edge 3/8"
F -- opening for OLED display 15/16 x 5/8"
G -- recess width 1 1/8"
H -- outter panel edge to recess? edge 1"
?I -- switch opening approx 5/16" from left edge, 1 3/16" from top edge (depends on switch used)

We will post the file when we find it. If anyone does create a new file, please share it here with everyone else and send us a copy. We will post it on our site (hamradiodesigns.com) if we can locate the original.

Jack, W8TEE

Received the AXICOM?V23105-A5403-A201 relays from mouser this morning and tested them. The results were NOT as expected (not low enough). Dissected one to make sure it had the AXICOM internal structure .....it does.

What would you consider the proper way of testing the relay for coupling ? I connected the two relay N/C contacts (which are also connected to the relay armature) ....one side to the TG and one side to the SA with/without a 50 ohm resistor across the TG output at the relay. Also attached a small wire from Ground to Ground. Then I added 47nF caps to ground at the coil leads to see the effect. The AXICOM relay had a 4dB reduction, the uBITX relay had a 9dB reduction indicating to me more had signal coupled to that coil.?

73 Kees K5BCQ

On Sun, Oct 14, 2018 at 09:12 PM, Ashhar Farhan wrote:

can you forward me the email that you wrote to hfsiganls? i will follow it up with them

?

- f

开云体育

You mic output might be bad. I had this occur on my bitx40. Over the course of a couple weeks I was not getting more than a watt out.?

You didn't mention the power out when driven by the computer.?


On my ubitx, made a 317 powered regulator and run the rig from a 20v old laptop power supply Warms the clouds to the tune of 20 watts on one swr meter and 30 watts on my older power meter.?

The case on my bitx40 is too small to add in a similar power supply.?

Saving one resistor you will need two diodes in series with both RX and TX line to prevent the
voltage at the common point to go back through the LEDs from RX to TX power lines and vice-versa.
The Voltage across the dropping resistor will be 9-10V.

I looked a random LED spec sheet and it had reverse voltage of 5V..

Raj

At 17/10/2018, you wrote:

开云体育

Or, one can connect the anodes direct to RX/TX lines and use a single resistor from cathode to GND.
Ion
VA3NOI

--
Ion

VA3NOI

Thank You

I will look up the correct address and send an email

Hello Scott,

happy your uBitx finally started with KD8CEC software ! He actually made a GREAT job to bring new features and ease of use.

Good luck for your next display build :)

73

--
Laurent F5FIE.

开云体育

开云体育

Typo : doesnt look right