FT-891 and TRX-manager CAT control software

I have successfully got FT891 running under TRX-manager: http://www.trx-manager.com/index.html

1) Install the dual serial port driver from Yaesu website. 
See manual here: http://www.yaesu.com/airband/downloadFile.cfm?FileID=9515&FileCatID=42&FileName=USB%5FDriver%5FInstallation%5FManual%5FENG%5F1610%2DB0.pdf&FileContentType=application%2Fpdf

(Note: the 891 has dual serial ports, it does not have an USB soundcard).

2) Reboot the PC and check that you see two serial devices in your Device manager (type device manager when clicking the start button)

3) Hold F on the FT-891 in a couple of seconds (long click)

4) Goto menu 05-06
Set CAT RATE to 38400

6) Goto menu 05-08.
 Set CAT RTS to DISABLE (unless you do that you may have a problem getting data thru)

7) Set the rate to 38400 in TRX-manager (setup menu) and select FT-891. Also select correct COM port (on my PC it was COM5. It may be different on yours).
Remember: unless you set CAT RTS to DISABLE (see above) you will not get data thru and you will mess around in the TRX-manager menus while the problem was a setting in the FT-891 menu.

8) Stop and restart TRX-manager

9) You may hear a clicking sound for every CAT transmission in your FT-891 loudspeaker (A bit annoying… I have to admit that even if I like Yaesu radios)

10) Click F on the FT-891 (short click)

11) Goto MON on the FT-891 menu

12) Click on MON

13) Turn down the MON level to 0
Note: This applies regardless if you have MON ON or MON OFF (this is a bug in Yaesu’s firmware. Rare. LOL)

14) Now you have CAT control without any clicking sounds on your FT-891

15) Enjoy your Yaesu FT-891

Comments about the FT-891: 

Plusses: the FT-891 has in my view a better and more modern RX than the ageing FT-857, even better than IC7300 (some ppl. claim) http://www.eham.net/reviews/detail/13042?page=2 , it is a low cost modern mobile 100W HF rig with a small detachable front, it has DSP RX, a nice variable RX filter, works well down to low voltages even if someone claims it doesn’t, has a much better menu system and a better VFO, it has a reasonable current draw on RX (even if the datasheet overstates this a bit it is below 1A on my rig).

Minuses: No VHF or UHF ( however that may be a benefit. Not the compromises that probably are in the 857 rf chain). No USB soundcard (do you really need that in a mobile station?), 60M USB has to be programmed in a memory and you go memory tune from there and it will keep USB even if you are below 10 MHZ.

How to do export and import of Excel files with CSV firmat in Chirp

  • Program a couple of memory channels in your radio (in my case Icom Ic-2725) from the RADIO menus
  • Connect chirp to the radio
  • DOWNLOAD the data from the radio
  • Export from Chirp to a CSV file
  • Study this CSV file and use it as a template
  • Copy paste frequency and ctcss and offset info ++ from ANOTHER XLS file to the CSV file you made above!
  • Save as CSV from Excel (this is now your frequency list to import to the radio)
  • Check with Notepad ++ that there is COMMA (not semicolon) separation saved when you save as CSV from Excel. If this is not the case, go to regional settings / additional and set list separator as , (as opposed to ;). Start and stop Exel and a reboot wont hurt to make the settings take effect
  • Now you import this CSV list into Chirp
  • Upload to the radio
  • If you get error message that Chirp cant convert floating point in the tone settings, make sure to format EVERYTHING in your Excel sheet as GENERAL (not text, not number)


CAT / RS232 / CW interface (FTDI, MAX232, 5V controllable FETs)

I made a CAT and CW interface from readily available components. Of course it is possible to buy a microham interface or simular. However, I wanted no USB soundcard functionality and Xp, Win 10, Linux compatibility without having to install drivers. A native FTDI chip from SF will do the job nicely. The FTDI chip has 5V TTL out and the true RS232 has +-1 12V signal levels. Therefore I pressed a MAX232 board that I designed approx 10 years ago and was laying in the junkobox into service. 5V TTL into and out from the MAX232 chip into the FTDI chip.
I used some “5V TTL FETs” for switching the CW signal. The RTS / CTS signals from the FTDI interface can drive these fets directly. I needed to invert the signal so that the CW keying is off by default. So since I had two of the 5V TTL FETs laying in the junkbox, I used one to invert and one to drive the CW key output. On the picture to the left the fets can be seen.
Here the quick and dirty prototype can be seen. The old RS232 converter board to the left, the switching FETs to the right and the FTDI board below.

HDSDR trackerball VFO project

I have been working on a trackball based controller for my HDSDR SDR project lately. This is a small R&D project that is run on my spare time where the goal is to determine if it is possible to use a trackball as a VFO for software defined radio (SDR) in contests. The project started out based on a demand for a more ergonomic way to operate a mult receiver in a contest environment that is less fatiguing during 48hours duration of a major contest like CQWW or CQWPX. The goal is that it should be possible to operate all radio functions you need from one hand only: VFO, speed of vfo, band, mode, filter width, volume, gain. I have modified a Marconi trackball and the controller is a Trinket Pro controller (Arduino)

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RF current amperemeter with log detector

I have long had the need to measure antenna current. This can be done by a rf-current transformer and a rectifier made by a shottky diode or fast silicon diode and an integrator driving a mechanical instrument. However the dynamic range is very limited with such a setup.

Therefore I made a new rf-amperemeter design with a log detector chip from Analog Devices driven from a current transformer made out of a split core ferrite material that has response in the HF and lower VHF frequency range.The current trafo is terminated in a few ohms and the RF current conductor (actually the primary) sees only a fraction of an ohm so very little influence is done on the circuit you are measuring. (Apart from capacitive coupling and a slight leakage inductance from the current transformer windings/ferrite combination). The ferrite core is a split type and is epoxied to a clip.

I calibrated the instrument by terminating the generator in a fancooled 100W dummy load and measured the voltage over the load by an oscilloscope. Since it has a log output the dynamic range from milliamp range up to 1,4A RF current. That would peg a mechanical instrument if you would at the same time want to be able to detect a significantly lower RF-current without having to change scales with switches / pot meters etc.

Next I plan on making a OLED display on this design with an arduino controller. Its a sparetime project so lets see how long tiem it takes before I implement that.

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Single Sideband (SSB) modulation on the Raspberry PI

F5OEO has recently written some code to transmit a SSB signal using just the hardware in the Broadcom SOC chip on the Raspberry Pi.  You can find more info on this link http://www.rtl-sdr.com/transmitting-fm-am-ssb-sstv-and-fsq-with-just-a-raspberry-pi/

I tested the code on my RPI on 6m via a cable connection. It worked OK. If you look at the S-meter you can see that the envelope is constant. This is due to that the RPI has no way of modulating the envelope so the software actually modulates frequency. It is kind of constant envelope SSB.

Below you can see what the signal looks like. (This is received on a SDR via an attenuator). The signal is a bit too wide. However cool test.

If you want to test the code yourself you can check it out over on F5OEO at github https://github.com/F5OEO/rpitx

Warning: do not connect the RPI GPIO output running this code to an external antenna without a bandpass or lowpass filter and a valid amateur radio license. Never transmit any signal outside the amateur bands.

How to upgrade your Windows installation without an internet connection

Sometimes the need arises to upgrade an old Windows installation. If you do have a slow internet connection or no internet connection, this may be a significant time problem. A full Microsoft download of SP3 and all hot fixes can take many hours on a slow Internet connection. Perhaps you now think: why is this relevant? I always have a fast internet connection, don’t I? But is this in fact true? What about at  a customer site with a slow DSL connection. What if the internet connection is down? What if it is an embedded system? What if you are installing from an old XP pre SP1 DVD where the new Microsoft Update methods are not supported? Well, in those cases you need WSUSOffline that can be downloaded from http://www.wsusoffline.net/ This is a set of scripts that automatically downloads the service packs, hot fixes, .NET frameworks and language support you need from Microsoft’s servers. You can select what components to install (se below image). The install files together with an installer script can be copied onto a USB memory stick. When you run the installer script on the machine you want to upgrade, everything happens automatically and you will, when the process is finished, have a fully updated Windows installation. I used this to upgrade an old machine with an old outdated XP installation on, for use with my CNC machine numeric control software.

Testing DxPatrol HF converter for Funcube dongle


At Hamradio in Friedrichshafen I picked up a DxPatrol HF converter for the Funcube Dongle ( Supplier WiMo, designer: http://www.ct1ffu.com/site/ ). I was eager to test it on HF CW reception. To check the coarse frequency and operation of the local oscillator I used my Yaesu VX7R for detecting the signal from the board. (The DxPatrol HF converter can be given a voltage feed via the SMA from the Funcube Dongle, if you turn it on from your Funcube. Alternatively, you can feed it with power via the USB connector – only 5V and GND is connected internally of course. I wanted to check that the converter was operating by listening to the local osc with my VX7R).

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I was a bit surprised over the test result when listening to CW signals on HF. All the signals on the bands sounded like russian stations from the old days derifting all over the place. The local oscillator of the DxPatrol I purchased is unstable. It drifts so much that it can clearly be heard on CW. The designers of the DxPatrol unit told me to keep the unit free from wind when I asked about a possible design or osc issue via mail hehe 🙂 . I think a “slight mod” may be necessary … I have SI570 and a buffer in my mind….

Collinear airband antenna design

I wanted to test a simple airband antenna design since I had a roll of balanced feedline laying around in my shack doing nothing useful. First I had to measure the velocity constant of the feedline with my MFJ-259 to be able to come to an estimate of the required length of the matching section. I could also have used my vector network analyzer (VNA) to do that by the way.  To measure without interference from coupling to adjacent objects I did the measurement with the cable hanging out from my balcony as you can see in the left picture. The MFJ-259 was connected in the end and held by hand (that is a benefit of the battery operated MFJ 259 even if the instrument is not of the most accurate on the market). I wanted to make two antenna segments folded over each other. Therefore the top of the feedline is shorted and the currents will be in phase if the antenna is of a proper length. The matching section is a shorted line section that is tapped by the transmission line. The coil on the coax is a choke (I haven’t done any measurements on that choke yet by the way).

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The procedure I used to find the velocity factor of the balanced transmission line was to first measure a length of the feedline with a tape measure. Then I connected the MFJ-259 and found the frequency where the lowest reactance could be measured. (See pic two from left on the upper row above. You can see that the X is very low). This was done in the mode of the MFJ-259 where it is possible to measure both R and X. This is the quarter wave frequency of the line when the wave propagates in the line – not in the free air (“ether”). Then I calculated that frequency back to the wavelength with  y=300/f. I then divided the tape measure length by the calculated length and came to a velocity factor of 0,89. This is the ratio of the wavelength in free air and the wavelength in the transmission line. This is directly related to the propagation speed of the line when it operates in transmission line mode. From that I calculated the required length of the matching transformer and the approximate tapping point on that transformer to reach 50 ohms. Please note that you cannot use the velocity factor of the transmission line to calculate the required length of the antenna (only the matching section), since the RF currents on the two folded legs on the antenna are in phase and therefore the one lead is coupled to the ether and not to the other lead.


The picture above shows the SWR as measured with my vector network analyzer from DG8SAQ. The markers on the right side shows a 1:2 SWR bandwidth of 118,5 to 128,6 Mc/s which is OK. The reference level is 1:1 SWR. This level is lifted one division for clarity. (I think the Mc/s  is a cool way to express frequency by the way.)


Here my DG8SAQ1 kc/s to 1,3 Gc/s VNA is shown. It is connected to my PC via USB.

Conclusion: a combination of the MFJ-259, the DG8SAQ vector network analyzer, some balanced line and some coax can be used to make a good collinear airband antenna in less than one our at a cost of a few dollars. The antenna was screwed to a wooden section of my roof by a small screw by the way and can be removed in approx 2 minutes.