Using a Modified SignaLink™ for FSK Transmission

KC9QQ Ready for NAQP RTTY Contest

KC9QQ
Ready for NAQP RTTY Contest

After the CQWW WPX RTTY contest I decided to modify my RTTY setup so that it could operate FSK instead of AFSK.  I wanted to do this because in the CQ WPX RTTY contest I had experienced several cases where the SSB filters (the only filters available during AFSK operation) didn’t provide the desired selectivity.  In a previous post (SignaLink™ USB Not Transmitting) I talked about the modifications made to my SignaLink™ for FSK operation.  I decided to tryout the modification in the NAQP RTTY contest on Saturday.

I didn’t have a lot of time to operate because I needed to take several hours off to attend our monthly astronomy club meeting.  However, I was able to spend enough time with the new setup to realize that being able to use the RTTY filters in the Icom 756 Pro III resulted in a substantial improvement over the SSB filters.

The RTTY filters were able to do a much better job providing error free copy of stations adjacent to other strong signals.  In a few instances, I used the Icom 756 Pro III’s  dual peaking filter to pull weak stations out of the noise.  I was impressed.  There were a couple of stations that I was only able to copy about 50% of their transmission, but after I activated the dual peaking RTTY filter I copied them error free.  I limited my use of the dual peaking filter because it did make it a little more difficult to tune in stations, but it was just a click away when I would run across a weak station that needed a little boost to be pulled out of the noise.

A Lesson Learned

I want to thank the station that took the time to tell me that I was off frequency.  I was about 50 contacts into the contest, but seemed to be having problems being heard on the first or second call.  Several stations had sent Agn? Agn? after I made my call.  After I called one very busy station at least four times he came back and told me that I was off frequency.  I looked at my radio and realized that I had left the RIT on!  I turned the RIT off and stations quit asking me to repeat my call and report!  Murphy is alive and well.  I didn’t plan on setting any records; I just wanted work a new mode, hand out a few contacts and have some fun.  All three objectives were accomplished.

Here is a summary of my results:

NAQP RTTY February 2014:  Low Power, All Band

Band QSOs Points Sections
80m 24 24 18
40m 43 43 22
20m 15 15 12
15m 30 30 13
10m 24 24 9
Total 136

Final Score:   10,200

SignaLink™ USB Not Transmitting

If you have ever had trouble getting the SignaLink™ to go into the transmit mode perhaps  you may find this article helpful.

After I operated in the CQ WW WPX RTTY contest I decided to modify my setup so that I could run my Icom 756 Pro III in the RTTY mode, in order to take advantage of the 756 Pro III’s nice RTTY filters.  This meant I had to switch from AFSK transmission to FSK transmission.  Since the SignaLink does not support FSK output  I started searching for a different interface which that would allow me to operate FSK.  While I was searching for other interfaces I came across an article written by K7SFN describing how to modify the SignaLink™ for FSK transmission.

Here is a link to Frank’s nice modification: http://www.k7sfn.com/projects/signalink.html.

SignaLink FSK Modification for Icom 756 Pro III

SignaLink FSK Modification for Icom 756 Pro III

I made the modifications to the SignaLink™ described in Frank’s article.  I also made a serial cable to connect between my shack computer and the FSK keying jack I had installed on the back of the SignaLink.

I reconnected the SignaLink™ to my computer and radio and setup MTTY to work with the new FSK setup.  I fired up the rig and MTTY and was receiving RTTY as I expected.  I then connected my Icom 756 Pro III to a dummy load to test the FSK keying circuit I had added.  When I tried to transmit, the SignaLink™ would not go into transmit (the PTT led would not come on).  I then spent two frustrating hours trying to figure what I might have messed up making the modification.  I even fired up Fldigi to see if I could transmit PSK-31 and it would no longer transmit.  I was concerned that I might have damaged my SignaLink making the modification.

Rather than lead you through my whole trouble shooting process I’ll just cut to the chase.  I followed the troubleshooting guide in the SignalLink manual  and could not correct the problem.  I then went to their website to see if they had any other solutions.  On the website they had the following statement:

My SignaLink™ USB was working perfectly but now will no longer Transmit – This is the most common problem we hear about and it is virtually **always** due to the software volume controls being reset by Windows.  This can happen if you unplug the USB cable, change the default sound card in Windows, or accidentally mute the SignaLink’s output.  Other things can cause this to happen as well, so please check your Windows software volume controls carefully.  Note that they will most likely be reset exactly opposite of how they should be set, so they can look correct at a glance.

I then repeated Tigertronic’s audio setup procedure and the SignaLink™ started transmitting again.  I don’t have any idea why windows behaves this way, but beware if your SignaLink™ will no longer transmit, be sure to go back through the audio level setup described in the SignaLink™ manual.  Had I known this could occur I would have saved myself several hours of troubleshooting.

I can now continue to use the SignaLink™ to receive RTTY and use FSK instead of AFSK for transmitting. I plan to try out the new setup during the North American QSO Party RTTY contest this weekend.

73,

Fred, KC9QQ

My CW Progress

During most of the time I have been a ham (other than my year as a novice) I haven’t spent much time operating CW.  After I passed the 13 wpm CW test for my General Class License, I pushed CW aside and operated SSB on the HF bands and FM on the local repeators.

This was definitely a mistake because my speed degraded over time and I missed out on the opportunity of becoming a proficient CW operator. I also lost many years of enjoyable CW operation.  Now that I am older and my ears or not as good as they once were, I have found that improving my speed and ability to copy CW has been a slow but rewarding adventure.

I have always been amazed watching or hearing other hams carrying on CW conversations at 20-25 words a minute; taking only an occasional note.  A ham I used to work with could carry on a CW conversation at 35+ wpm while also having a conversation with someone in the shack!  I found that truly amazing.  I’m sure I will probably never be able to copy 35+ words per minute while carrying on a conversation with someone in the shack, but I have at least set a goal of being able to head copy normal QSOs at 25+ words per minute.

Elecraft K2 During Assembly

Elecraft K2
During Assembly

After I retired in 2008 I put my TS-520 back on the air and spent more than a year operating SSB in contests and chasing DX.

In 2009 I decided to purchase an Elecraft K2 (10 Watt) transceiver kit; to re-experience the joy I had found building Heathkit and Knightkit kits during my early early ham years.

K2 Interior

K2 Interior

The Elecraft K2 is a marvelous kit; which was somewhat more challenging to build than the Heathkits and Knightkits I had built, but the end product turned out to be a transceiver that worked as well or better than many commercially built models. When it was finished I realized that its receiver was practically as good as my Icom 756 Pro III. Since my K2 was initially configured for only CW, I had to us CW to tryout my new masterpiece. I discovered that I really enjoyed operating CW, but my speed  and comprehension were below the 13 wpm I had mastered to get my General license.

I decided to work on improving my CW skills.  I have made significant progress from my sub-13 wpm speeds, but I’m still not copying as well as I want to.  Therefore, I continue regular practice to further improve my speed.  For my practice sessions I use three programs. They are:

  1. Morse Runner  http://www.dxatlas.com/morserunner/
  2. G4FON (Kock method Trainer)  http://www.g4fon.net/CW%20Trainer.htm
  3. RufzXP  http://www.rufzxp.net/
G4FON Kock Trainer

G4FON Kock Trainer

I started with G4FON which will send random code groups, simulated QSOs, and a list of common words using the Koch method.  In the Kock method of learning the individual letters are sent at the user selected final speed (e.x. 25 wpm) you hope to achieve but the letters are spaced out to a lower user selected speed (e.x. 15 wpm). This is done to help you learn what the letters sound like at the high speed,  but with the letters spaced out so you have a little more time to think between letters while you are learning.  Initially, I tried to copy down all of the letters, but I found that I was unable to write the letters down much faster than 20 wpm.  Therefore, I would run sessions where I would listen to complete words without trying to write them down.  This removed the pressure of trying to write down each letter and it helped me begin to form the sound of the words in my head.

Morse Runner Contest Simulator

Morse Runner
Contest Simulator

Morse Runner is contest simulator.  When you run Morse Runner you set your desired operating speed and call CQ.  Stations then call you and you have to correctly copy their call letters and exchange to receive credit for the QSO.  The program setup can be customized to provide a very realistic simulation of actual contest QSOs; including QRN, QRM, multiple callers and even LIDS.  This program has helped me to combine copying the code with keying the received code into my computer. Developing this skill is essential for CW contesting.  The neat thing about Morse Runner is that it adds and element of fun to your CW practice.  You really have the feeling your are participating in a real contest.  Since it is focused purely on contesting it doesn’t help a great deal with head copying conversations but it is very effective in helping one to simultaneously copy and type call letters and contest exchanges (serial number).

RufzXP High Speed Callsign Trainer

RufzXP
High Speed Callsign Trainer

The program I find the most challenging is RufzXP.  RufzXP sends call letters which you must accurately copy.  Each time you correctly copy a set of call letters RufzXP increases its sending speed for the next set of call letters.  Some of the sets of call letters can be very long such as: JA1ZPM/KP5/QRP.  It will send a set of 50 call signs.  You are graded on the number of correct call signs and on your maximum speed.  It is almost impossible to not make mistakes because it keeps speeding up until you do make a mistake.  However,  it is very effective at pushing you above your best speed;  which is a key factor needed to increase your speed.

So how is my CW today.  Well it is still not as good as my goal, but I am getting much better. During contests I am able to copy call letters and exchanges at 20-25 wpm.  When the call letters come at me at 30-35 wpm (especially with lots of dits! e.x. HB5HSI) I often have to listen to the call sign several times to get the correct call.  I try to operate several CW contests year, both for the enjoyment and to improve my skill.

As far as rag-chew QSOs, I can now head copy around 20+ wpm but I am still 5-10 wpm below where I would like to be.  Also sometimes a longer word will throw me and cause me to miss a couple more words just trying to get my brain back in sync!

I’ve heard a lot of hams explain how their speed was 10 wpm and after they worked Sweepstakes one weekend their speed had miraculously increased to 25 wpm.  I assume these stories are true, but I that has not been my experience.  Every gain in speed I have achieved has taken hard work and hours of practice.  I’m sure a big part of my problem is because my ears are just not as good as they used to be.  I have mild tinitus  in both ears which is probably slowing my progress.  However, even with that handicap, my speed continues to improve-albeit not as fast as I would like.  At least, now my speed is high enough that I enjoy just listening to CW QSOs.

What is the solution?  There is no doubt that the only way to get my speed above 25 wpm is continued practice and on-the-air operation.  With a little luck, I think this will be the year I achieve my goal.

73,

Fred,  KC9QQ