Ever since I moved to my house I always had noise in my receiver. It wasn’t loud enough for me to care until now. For the past couple of months the noise has been real bad. Bad to the point where I didn’t even go past 20m (14mhz). I Figured when Field day comes around I will be able to see if its something with the radio. I turned on the radio at field day and the noise was still there. I was upset that I was going to have to ship my radio to YAESU for repairs. That is until someone turned off the light that was 3ft near the radio. THE NOISE IS GONE!!! YES!!! Found out that the cheap-o CFL Bulb (or it’s ballast ) was causing the RFI. I thought that this might be the same cause at my QTH. So after field day I setup back home and tried the radio without the lights. Noise was still there. Today I finally got off my ass and started to track down what was causing the RFI. I went to cellar and turned off all the circuit breakers except for the room which the FT-950 is in. The noise is still there. I unplugged everything in the room except the power supply and the Noise was still there. At this point I took a TV car battery (sealed) and hooked it up inside. The noise is GONE! With the process of elimination, I found out that the power supply was to blame. Back when I purchases the FT-100, I Moved the power supply close to the radio so I could power both the radios.
The power supply that was causing the RFI is the SAMLEX SEC-1223. I googled the model number and there were numerous sites that mention the RFI that power supply generates.
Two sites that stick out when it comes to getting rid of the noise are http://www.n0ss.net/ – PDF
ZL2DF used ferrite beads and ceramic disk capacitors (about US$10 for part modification) placed right before the output terminals and OZ1DB used two 1.5uf 100V Capacitors ( US$ 3) on the output terminals
I will be participating in Field Day this year with the folks from the Hampden County Radio Assocation ( HCRA ). I’m excited because I will be using my FT-950 as the site’s HF Digital station (Mostly PSK, RTTY). So if you live or will be in the Western Mass area on the 25th and 26th of June and want to see Field Day up close, we’re going to be at Dufresne Recreation Area in Granby, Massachusetts. All are welcomed, licensed or not. Please visit the Field Day page on HCRA’s website. Also check out pictures and data from prior years
For those who don’t know about Field Day, It’s basically an event that takes place on the 4th weekend of June to test emergency communications and it’s deployment. Over 30,000 operators across US try to communicate with as many other field day operators as possible. Points are awarded to operators and/or clubs that make contacts and perform other tasks that would allow for more points ( For example: media coverage, getting Non Hams on the air [GOTA], Copying/fowarding messages). Some Hams treat this as contest even though the ARRL considers it an exercise. Whatever the case may be, it’s really fun and it can get you out of the house.
I’ve participated in Field Day multiple times at multiple hosts over the years. I’ve had a Digital setup back in 2004 and had a blast. I recall being very busy using digital back then, I hope that it’s even more popular this year compared to 2004 and hope to be more busy making contacts all over HF.
What: ARRL Field Day Hosted By the Hampden County Radios Association
When: Saturday, June 25th, at 14:00 (2pm), untill Sunday, June 26th
Where: Dufresne Recreation Area, Granby MA, 01033
Why: Because it’s fun, social and you get to operate all different type of equipment.
Since I got the SignaLink I figured I can mess around with the Rigblaster. I wanted to adapt it to the FT-100 so If I ever go out with it and a laptop, I can do some digital work using the rigblaster as a interface.
I Followed the directions to the T and here it is!
Just some things I would like to point out. The FT-817, FT-857D, FT-897, FT-100D, FT-950, FT-2000 and I am sure many other makes and models use the MINI 6 PIN DIN connector which is the same as a PS2 cable that you find on a semi older keyboards and mouses (mice). I thought it would be easy and just find a old mouse or keyboard, clip the wire and use the connector. Well guess what? The PS2 Mouse and keyboard use 4 out of the 6 pins and the two that have nothing connected to them are need to wire up for the Yaesu rigs. You just might be lucky and come across a cable that works. I went through about a dozen keyboards and mouses until I gave up. Getting frustrated I went on Ebay and picked up a 6 pack of connectors for $10 w/ shipping.
If you follow the entire article on the above link you can make a cable with just basic soldering skills. I added a ferrite choke to the data and audio cables to help cut down on the noise generated from nearby objects.
After constructing the cable and testing it out, I wasn’t too impressed on it’s performance compared to hooking the NOMIC up using the Microphone jack and audio patch cables.
I notice it didn’t sound right. I don’t have the proper analyzing equipment to give a detailed reason why but if you look at the band edges on the above picture, you will notice a drop off which I never seen with the unit normally hooked up. I also notice that the audio is not as strong either. I had to max out all the settings on my soundcard and radio. Even with the levels maxed and removing the resistor on the NOMIC board, the audio still seemed low.
Overall I am not too thrilled about the outcome of the cable but it works. It makes it possible to use the microphone again and It’s going to help on a future project I have in the works.
Recently I purchased a SignaLink USB from HRO in NH to replace my Rigblaster Nomic. The Reason for doing so is that the SignaLink has a built in sound card. That means only one connection to the computer is required. It also Isolates the soundcard so I do not have to adjust my computers sound card every time I want to use digital.
Price (@ HRO): $99
Platfrom Installed on: Windows 7
Radio Used On: Yaesu FT-950
Software Used With: Ham Radio Deluxe, WSJT
When purchasing the SignaLink you can either get one to adapt to your microphone jack or your data jack (If you have one). Since the FT-950 has a RTTY/PKT port on the rear of the rig, I purchased the SL-USB–6PM. The 6PM stands for “6 PIN MINI” which is what the RTTY/PKT Port uses (Similar to a Mouse/Keyboard cable).
The box comes with everything you need to get going. Included in the box was the SignaLink USB unit,6ft USB-A to USB-B cable (Similar to current USB Printer cable), 2Ft of Rj45 to 6 pin Mini din cable (From the Unit to the radio), 1ft Male to Male audio (stereo) patch cable, Jumper wires, Allen wrench, Software CD (Contains Jumper Diagrams and Various ham radio software) and Manuals.
Nice Rear!!
The initial setup is very easy with the kit I purchased. Just plug the USB cable into SingaLink then into the computer, then plug the Data cable into the SignaLink’s RJ45 jack and plug the 6pin Mini Din into the rear (RTTY/PKT, DATA) Port of your radio. Depending on your Operating system. The system will automatically recognize the SignaLink and install the default drivers for the sound card that is in the SignaLink.
The software and radio setup could be a little confusing to some people. But it’s similar to any other interface that is out in the market. The only thing is is really different is that you will now have TWO sound cards showing up on your computer (Your computers and the SignaLink). You will have to do some on software adjustments for the SignaLink sound card (Labeled “USB Audio Codec” or “USB Audio Device”) and you will have to modify your settings for each software that you use for communications. Tigertronics website provides a great amount of information on how to setup your SignaLink USB to your computer and will provide technical assistance over the phone\e-mail.
On the radio side with the FT-950 I went to menu # 51 (Data Out Lvl) and # 53 (Data V Gain) and changed the value to 90 to max out the levels. If I need to changed the RX and TX levels of the data port I can do so on the fly with the knobs on the SignaLink. I also changed FT-950 to display the ALC meter.
Now it’s time to pick a frequency and start doing some “Digital” Communications. I picked my favorite 14.070mhz. At this point I am adjusting the RX knob on the SignaLink to make sure I am not overdriving the DM-780 software. I keep my level around 40%. If you have the RX knob maxed out (turned fully clockwise) and you are getting less than 10% of audio then check the software settings on the “USB Audio Device” and the settings on your communications software (For example DM-780 has Attenuation level. That box should be turned off or at zero). If it’s still low then check your rigs Data Settings and max out the RX and TX gain
Once the RX is set, it’s time to start transmitting. Soon as you start transmitting adjust the TX knob so you see nothing on your ALC meter but the power is still at the level you set it at. The picture above shows that I set the power to 20 watts. in the PSK field you really do not need much power. I see a lot of people running high wattage which just makes it hard for others to communicate as they are causing QRM to stations near.
That’s It!
So far I am loving the SignaLink USB. My sound card is now free so that I can listen to music again. Windows OS sounds will no longer be transmitted (DING!), I no longer have to readjust my soundcard for digital. I can also use my microphone jack for it’s intended purpose; for plugging a microphone into. I can switch from digital to SSB in seconds! I wish I purchased one of these with the radio.
* – I am not tech support for the SignaLink, I just want to show how I went about putting it together. If you have issues please go to http://www.tigertronics.com
Before I upgraded to general I purchased an FT-857D. I was planning on putting it in my truck but I ended up using it in the house since it was my only HF rig. I wanted a bigger system so I could put the 857D mobile and I ended up getting a Kenwood TS-430s. After making the impulse purchase I realized that the TS-430S is not suited for digital. I kept using the FT-857D as a home unit and then I decided to sell everything for a new HF base that could handle digital. I was debating between the Kenwood TS-2000 or the Yaesu FT-950. For reasons which are unknown I ended up getting the FT-950. I am loosing VHF and UHF by getting the FT-950 But I think I made a wise purchase. So far I am loving this rig, it’s taking some getting used to but it’s amazing how a couple of adjustments makes a someone who I can barely hear sound like S9.
