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Archive for Radio Equipment

Shack Shelf 160

Ham Shack Shelf

Posted by Jim Wilson 
· Saturday, June 1st, 2013 
· No Comments

This past week I spent some time building a simple shelf in my ham shack to hold the Elecraft K3 and P3. While the tilt bail places the units at a nice viewing angle, I decided I’d like to get them up on a small shelf which would allow a bit more desk space. You can see the results in the nearby photo.

New Ham Shack ShelfI also used some small wedges to put just a slight tilt to the front panels of both units. This helps the display and the lighting of the front panels by the LED strip above them. Had to move the strip just a bit to accommodate this change. Another nice result is that the backs of the two units rest against the back of the top shelf, holding them firmly in place whenever I need to press a button on the front panel. Works perfectly.

I won’t be bragging about my wood working skills. It’s my usual slightly sloppy construction, with one of the leg assemblies quite a bit out of alignment. The finish is Danish oil rubbed into the poplar wood. Now I’m thinking about adding a couple of coats of polyurethane. Perhaps that’s my next project.

Ideally, this configuration will help me in the next contest. Placing the Winkeyer underneath the K3 and P3 makes it a lot easier to access than where it was, behind the key. We’ll see how it goes.

No Comments
Categories : Ham Radio, Radio Equipment
Tags : Contest
DB-9 w CAT6

CAT6 Cables

Posted by Jim Wilson 
· Saturday, May 4th, 2013 
· 7 Comments

I’ve been working on a cure for a problem encountered during long RTTY QSO’s where the transceiver will drop out of transmit and lock up. Initially, I thought this might be due to RFI. So I tried some ferrite clamp-on devices on the K3 to P3 to Computer control cables. Next I read up on RFI cures and came across K9YC’s suggestion to use CAT-5 or CAT-6 cable rather than standard RS-232 cables. So, I set about on a small adventure building a set.

The first approach I took was to adapt converters for RJ-45 connector to DB-9 connector. This would allow me to use standard RJ-45 CAT-5 or CAT-6 cables. I was able to make up one set but really had trouble on the second set. So I abandoned that approach and purchased DB-9 solder connectors. This morning I was finally able to build the two cables needed to connect the K3 to the P3 and then P3 to the computer.

The cables work great but the problem remains. Now I’m not sure it’s due to RFI. Plus, an interesting twist has been added, perhaps an improvement. With the RS-232 cables the K3 would lock up and I’d have to shut down N1MM and turn it back on to recover. With the CAT-6 cables I’m now able to just switch to receive and get it back up and running. That could be an improvement or perhaps I just didn’t tumble to this recovery option in past attempts. Gee whiz. At least with the short QSO’s in contests I do not encounter this problem. More later on this adventure.

 

7 Comments
Categories : Ham Radio, Radio Equipment, RTTY
Tags : RTTY, Software
F1500_new_RAV

FLEX-1500 SDR

Posted by Jim Wilson 
· Saturday, January 19th, 2013 
· 2 Comments

If you’ve been keeping up with my posts, you know that last week I won a FlexRadio Systems FLEX-1500 in a drawing at the Lone Star DX Association quarterly meeting. That post is titled Lucky Guy and, indeed, I am a very fortunate guy to win this gem.

After I got the rig home, I started looking over the website determining how best to get it set up. First issue, it operates in Windows only. That’s not the best situation in an all Apple household. Second issue, while Boot Camp on a Mac is supported, vitual machines are not. But after contacting Greg Jurens, K5GJ, of FlexRadio Systems, who was the speaker at the meeting, he noted that he and many others operate with a virtual machine and that the FLEX-1500 was well suited for this approach since it uses a USB connection rather than the Firewire connection for their other rigs.

So today I connected everything to the very compact box and fired it up. For a computer, I used a MacBook Pro running Parallels as the virtual machine with Windows 7. The initial steps are all about getting the software set up, which you’d expect from a software defined radio. All that was pretty straightforward using the software disk that’s supplied with the rig. Then, when you turn on the rig a few more drivers are installed. Here’s a photo of the rig in operation.

Flex-1500

I tried CW using my Begali Graciella key, which is close in size to the rig itself. For some reason, the internal keyer didn’t readily connect my ear and key as I had a bit of a problem matching up my fist. But the tuning was great and the visual display really stunning. There were a number of useful features around filtering, etc. Plus, there is a contest window for programming your messages for the function keys. I also connected my NorCal QRP Wattmeter and can verify that the rig can put out 5 watts.

Next I tried the WWV settings where it very handily moves from one frequency to the next (2.5, 5, 10, 15) with the click of a button. I also tried the general coverage bands and listened to some AM broadcasts. It’s a very nifty full-featured receiver and could be fun entering some of the contests in QRP categories or just getting on the air and working QRP. In addition, as Flex points out, it would no doubt work great with transverters for VHF-UHF operation.

For me the next steps in the Windows world that this rig operates in would be to set up a logging program along with a digital modem for RTTY and PSK. Over the past year or so I’ve wrestled with getting a Windows computer just for the ham shack. What’s tempted me along these lines is that it would allow me to put into play all the great sofware that is available for ham radio in that operating system, from N1MM to MMTTY and so on. My latest venture into RTTY makes this an very interesting option and this rig would make one more reason. Still, not really sure I’m ready for that move. Plus, my finances this year are strapped with all the travel, etc. needed around the National Scout Jamboree.

Stay tuned to see what happens going forward — always finding ways to achieve some level of continuous improvement — or is it continuous movement?

2 Comments
Categories : Radio Equipment, Radio Software
Tags : Software
F1500_new_RAV

Lucky Guy

Posted by Jim Wilson 
· Sunday, January 13th, 2013 
· 3 Comments

Yesterday I attended the Lone Star DX Association‘s quarterly meeting. The meeting promised a presentation by Greg Jurrens, K5GJ, from FlexRadio Systems to discuss Software Defined Radio (SDR). An exciting addition was a drawing for their FLEX-1500 160-6m QRP transceiver. The BBQ lunch is always good as well. Plus, I brought my QSL cards for card-checking — should have DXCC 200 countries on CW soon.

Greg took us through the principles of SDR along with some comparisons of existing amateur radio transceivers. He also went well into the detail around signal processing and just how the whole thing works — at least as much as I could handle. The versatility is really amazing and the display with panadapter visuals, etc. is really neat.

Then it was time for the drawing. They slowly announced the winner: K-5-N-D. I sat there waiting for someone to jump up all excited about winning. When that didn’t happen, I processed the call sign and found it was me! It was a bit like waiting in a CW pileup and when they finally call your call sign you’re stunned and slow to action. How lucky I am!

I now have the radio at home. Looked up the software requirements — it runs on Windows only and they are noting that you can run it on a Mac using Boot Camp but don’t recommend using virtual machines, like Parallels. I have been toying several different times with getting a Windows computer for my ham shack to support contesting and now RTTY. This could certainly provide the momentum to move in that direction.

This promises to be another incredible ham radio adventure — and this one is just getting started!

3 Comments
Categories : Radio Equipment, Radio Software
Tags : Software
RTTY-Tape-Slant-V3-160

RTTY Adventures

Posted by Jim Wilson 
· Monday, December 31st, 2012 
· No Comments

This past week I’d worked my way through most of my task list and decided to investigate digital modes. Back in the very early 1980′s I was exclusively into RTTY operation as KB8CE. That station had a Teletype Model 19 with paper tape reader and punch. It also had a rack mount demodulator that I’d built with 88 mHy toroids and a 4 inch scope that I’d salvaged from an old oscilloscope. Also in that rack was a R-388 receiver, for press transmissions, and a UART gear shifter that used digital techniques to move from various RTTY speeds to the speed my teletype was set. I wrote an article on the UART that ran in Wayne Green’s 73 Magazine.

So fast forward to the waning days of 2012. I had previously tried receiving PSK a couple of years ago and wasn’t overly impressed. This time I spent some more time in getting RUMlog and Cocoa Modem up and running correctly. Even spent some time with the documentation for both of the programs. Learned a great deal in the process and got some things corrected in the set up.

I have to say that Cocoa Modem is absolutely spectacular in the features it offers. With PSK it provides a table of all the contacts going on within the window of your receiver, something like CW skimmer but this provides the running dialog with each of the QSO’s. This is a really nifty set up. With RTTY it allows running both receivers so you can scan the bands or you can better monitor the split operations to find out who is responding to the DX’s calls. Meanwhile, RUMlog directly interfaces with Cocoa Modem to make the QSO’s simple. In addition, RUMped — the contest logging program also by Tom, DL2RUM, interfaces directly with Cocoa Modem. This is a very nice set up and works quite well, once I understood exactly how to set up everything.

I’ll further note that the Elecraft K3 works beautifully for RTTY and PSK with the built-in audio interfaces, I only use stereo cables direct to my iMac. Plus, it has special filters just for the mark and space frequencies. All in all, I’m really pleased with how everything has come together to make what appears to be a first class RTTY/PSK station, all for a couple of cables and some software configuration.

I’ve made a few PSK contacts along with some RTTY contacts. I have to say that I really like RTTY. It must be the nostalgia of getting back into this mode after 30 years and the sound of the diddles. I also plan to get on for the ARRL RTTY Round Up this coming weekend. That should give me some experience!

Yet another ham radio adventure — RTTY and PSK! Fun times!

No Comments
Categories : Radio Equipment, Radio Software, RTTY
Tags : RTTY, Software
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