Capacitor adapter

Sometimes I have to measure caps but when their leads are small they don't fit in the meter, so I came up with this adapter...using just two little pieces of PCB and alligator claws.

pure genius hum?

Another photo:



I was sure it had more capacity....

Still have solder a little pcb to fix the 2 parts together....


...done:

before you think... the "bridge" holding the two parts is soldered but isolated....

...and meanwhile I add an adapter for the resistance, voltage and frequency of the multimeter, I like to use thin wire for the leads and they tend to break on the banana plugs due to heavy use (look close on first and second photo), this way I hope they last longer...

This multimeter has been a real workhorse (and was considerably cheap), considering the abuse already suffered, a miracle it's still working.

Announcing The "Azores" Winners

"...

Announcing The Winners

At 11UTC on 15 October 2012, the winners of the Nine Islands Lottery were selected by Club Log, using a randomised computer selection process.
In the first draw, there were a total of 11,404 tickets from those stations who worked 5 or more islands. The prize was won by OS6A, Filip Coysman.
In the second draw, the first 25 stations to work nine islands were eligible. The prize was won by G3ZSS, Peter Bacon.
Congratulations to the winners and thank you to everyone who participated in the Azores Nine Islands Hunt!
VisitAzores.com..."

 Here's the original post

So... I have to wait a little more to visit the Azores!

One thing is sure...at least 11404 hams were active that day and worked 5 islands!

Had lot's of fun making the QSO's. I wasn't so much time on the radio for a long time!

10m QSO

Yesterday before leaving the shack I turned on my little CB/10m radio...

 

... the one bellow :)...

 Ivo, OK2BGW was calling DX and I answered, honestly I was not expecting a reply since I was using the indoor antenna...



And here's the result after some patience from Ivo fighting QRM (I think it was more low signal from my part):



First QSO with this radio and on this log book...not that my other loogbook is fuller.

Others were using something like 1 and 2 W on 10m this weekend, everybody going "green"? Not me, I used an wooping 20W!



If propagation continues like this I'l probably make more QSO's on 10...

Telemobile HX340 external mic/ptt

After some blind testing and a lot of debugging:

 
...here's the external mic/ptt schematic for the Telemobile HX-340 handie



Without a schematic of the radio I have no idea if this is the best way for connecting an external mic/ptt but, anyhow, it worked.
Audio is not perfect but workable and can be tailored with a better mic or slight change on the bypass cap.

Have a nice weekend!

Telemobile HX340 programmer

 After some initial frustration mainly by the lack of schematic and manual for the HX340 I found some information that wanted to test to see if the radio was easily programed.
In my first tests I was using a programer similar to an M-bus programer but that information was wrong (don't believe everything on the internet!), the Telemobile HX340 uses a simple TX/RX interface.

The correct information and correct software came from a post by EA3CWT in the URE forum, and I can only add that the "M" button on the radio should be pressed for reading and depressed for saving/program the data (switch on and off the radio to change state).

The computer used for programing, a Compaq PIII 500Mhz, the slowest working machine I have at the moment, apparently as with many old DOS software, the correct timing on the "com" port is dependent on a slow CPU:
The software didn't run well on a newer/faster pentium class machine.

 Schematic from the RS232 DB9 to the programing plug on the radio:

The built data cable recycling an old Cisco terminal plug:

The programmer software as per the URE post is here: http://www.ure.es/yabbfiles/Attachments/Hr-340.zip

And I used an Windows 98 DOS install (less the windows setup part) disk but it should run in any DOS boot diskette.
 
And now the programed equipment, for my frequencies, with the bottom lid placed and ready for some action... one of this days... because I have to program/test the other unit and do an external mic/speaker cable.

Have fun!

Telemobile HX340 batery

In a previously blogged equipment exchange I got 3 channelized Telemobile HX340 mobile radios. One was completely dead the other ok and programed with some repeater frequencies and the last one after the keyboard replacement (with the dead unit one) I think is now OK and only needs programing.
Problem is that all the radios came without the 9.6V battery pack.

Since new batteries are expensive I had to brew my ow solution. I must say that I have no interest in putting new batteries in them since they will be operated at a fix position and from a 12v power supply.

So I came up with this simple fix for the problem....that is, built a fixed battery holder...

 Terminal polarity identification


First mechanical fitting test

 The fix crews make pressure for the nails against the terminals and use already in the unit fixing points.
Regulator is a 7810 but the radio only need's 9.6V... it works.
Incidentally the power pins in the radio are easily soldered so I could had opted for a simpler solution (without the pressure brass nails), just the wires soldered directly to the terminals....maybe will do that on the other unit.
A bottom plug is also ready but I didn't sealed the unit yet, I have to get one panel power input plug and fit it on the side.

 Now I only need to program the units for the frequencies that I want....and that will be another story....

FT-817 CAT interface

Now that I have the FT-817 I need something to program the rig on an easy way since the buttons are a little on the small size....

Grabbed the first schematic that I encountered.



Made some changes, actually one change, and voila: it's working...

Here's the windows FT-817 commander software, and older version since now it's integrated in "Ham Radio Deluxe" but it's enough for me.

 

The final work:
 

Have fun!