Channel: G4FRE RADIO BLOG

↧

HPSDR on 70MHz WSPR

December 22, 2012, 3:34 pm

≪ Previous: ADS-B using the R820T USB Dongle and VirtualRadar

Tonight I decided it was time to work out how to interface the HPSDR to the K1JT WSPR programme and try it on 70MHz. My Penelope board has a -20dB coupler on the output giving 0dBm which is fine for driving my DEMI L70-28 transverter http://downeastmicrowave.com/PDF/VHF-UHFXVERT_pd.pdf (serial number 1!) to 35W maximum. The normal 0.5W output of the Penny board should be terminated in 50 ohms to protect the output stage

I use the W5WC dual RX version of POWERSDR as this allows me two 96kHz chunks of the band to be seen at the same time. Usually one is on the beacons and one is on the calling channel

First I installed my paid for copy of Virtual audio cable which will allow the audio to be connected between the 2 programmes. It was configured to support VAC1 and VAC2.

Next a copy of N8VB's VCOM programme was installed with 2 pairs of cables, COM6>COM16 and COM 7>COM17

In the HPSDR Setup, CAT control TAB the port is set to COM 16, RTS and enabled:-

Next the VAC setup in HPSDR. VAC1 is setup as VAC2 as the input and VAC1 as the output:-

Next the WSPR programme needed setting. Audio IN is set to VAC1 and audio OUT is set to VAC2. Note these settings are the REVERSE of the HPSDR ones

Drive level to the transverter was set to produce 5W output. The 10MHz reference for the HPSDR was produced by a Thunderbolt GPS unit, which also, with the help of KE5FX "Lady Heather" Monitoring programme http://www.ke5fx.com/heather/readme.htm was used to set the computer clock every 15 minutes. The 70/28MHz transverter Local Oscillator is not yet GPS locked; an upcoming project based on the G4HUP DFS design

The system was allowed to run whilst packing the Christmas Candy

Looking at the WSPRNET spot database http://wsprnet.org/drupal/wsprnet/spots it was pleasing to see the signal had been seen:-

2012-12-22 22:16	G4FRE	70.092565	-15	0	IO82uc	5	M0NKA	IO92	95	63
2012-12-22 22:16	G4FRE	70.092534	-22	-1	IO82uc	5	PA0TBR	JO22pi	517	84

The PA0BTR spot was the ODX for the days spots on 4m; not bad for my Indoor Halo!

↧

HPSDR on 70MHz WSPR again

December 23, 2012, 7:51 am

≫ Next: PA checkout day

≪ Previous: HPSDR on 70MHz WSPR

Overnight I remembered that it is possible to control the HPSDR under Cat control. It can emulate the TS-2000. So I went into HPSDR setup and changed Cat control to 4800-N-2 on COM17 and enabled it:-

In the WSPR program under station parameters PTT method was changed to CAT, enable cat was ticked and Kenwood TS-2000 4800-8-N-2, no handshake chosen:-

Remember N8VB VCOM previously set up a virtual com cable between com7 and com17
Now the HPSDR is controlled without DTR etc. WSJT can also control the frequency.
Efforts were rewarded. My signals were heard in Holland:-

2012-12-23 19:12	G4FRE	70.092501	-23	-1	IO82uc	5	PA0O	JO33hg	614	74
2012-12-23 16:08	G4FRE	70.092507	-17	-2	IO82uc	5	PA0O	JO33hg	614	74
2012-12-23 14:56	G4FRE	70.092474	-16	-1	IO82uc	5	PA0O	JO33hg	614	74
2012-12-23 14:22	G4FRE	70.092485	-18	-3	IO82uc	5	PA0O	JO33hg	614	74

And in the UK:-

2012-12-23 15:54	G4FRE	70.092522	-20	0	IO82uc	5	G3SHK	IO90dx	131	162

2012-12-23 12:00	G4FRE	70.092501	-25	-1	IO82uc	5	G0MJI	IO83ni	144	344
2012-12-23 10:32	G4FRE	70.092521	+12	1	IO82uc	5	G3LVP	IO81wv	26	154
2012-12-23 09:24	G4FRE	70.092451	-15	3	IO82uc	5	M0NKA	IO92	95	63

And I heard a signal from Holland:-

2012-12-23 14:02

PA0O

70.092501

-30

-1

JO33hg

G4FRE

IO82uc

614

261

↧

PA checkout day

January 3, 2013, 4:04 pm

≫ Next: 477kHz WSPR on a non optimum antenna

≪ Previous: HPSDR on 70MHz WSPR again

Provoked by an email by G4BVY after borrowing his 1kW 30dB bird tenulune I decided it was time to test out some amplifiers

First up was my Elecraft KPA500. It still had the old V1.11 software so this was upgraded to 2.23. It was then tested out and worked fine, a good tryout in preparation for this weekends ARRL RTTY contest

Next up was the 70MHz amplifier. Previously I had acquired a DEMI 48V 50MHz 300W PA. As the KPA500 gives me 500w on 6m it was decided to put it on 4m. Steve told me the only thing that would need changing is the low pass filter. Looking in the junkbox and finding some UNELCO caps and some 2mm silver plated wire one was built and installed.

Next a 48V power supply was needed. I had bought an Erskine one from Jim GI1CET on ebay (I first saw them when he had them at the EME2012 conference but was too late to get one) Unfortunatelyt it produced 54V, bit high for the amplifier. Using the instructions provided, the cover and sisterboard were removed and a 220k resistor put in parallel with the 22k resistor to the right of the voltage set pot. This gave me the 47-50V range which was ideal

Hooking up the PA to the output of the DEMI 70MHz xverter (configured so that whatever i did it could only run 10W maximum, rather than its normal 35W) 8W gave me 370W on 4m . A quick test showed that it still gave 400W on 6m for 6W of drive, both of which were acceptable

↧

477kHz WSPR on a non optimum antenna

January 4, 2013, 5:56 am

≫ Next: MLA2500B Still works

≪ Previous: PA checkout day

I had a brief listen on new years day on the new 477kHz band and heard M0BMU, G0MRF, on cw but last night I decided to see what else i could find

I hooked up my Anan10 to powersdr, set the dial to 474.2kHz USB and launched the WSPR programme and let it run. The antenna was my indoor DX-EE 40/20/50/10m dipole

The first couple of decodes took me by surprise:-

2013-01-03 22:14 DF2JP 0.475628 -27 0 JO31jg 0.5 G4FRE IO82uc 633 282
2013-01-03 22:14 PA3FNY 0.475636 -27 0 JO22nc 0.2 G4FRE IO82uc 506 273

Leaving it running for another hour the following new stations were identified:-

2013-01-03 23:24  G4HJW  0.475700  -22  0  JO02de  0.5  G4FRE  IO82uc  177  268
2013-01-03 23:12  G8IMR  0.475735  -16  0  IO90iv  2  G4FRE  IO82uc  151  333
2013-01-03 22:32  PA0A  0.475725  -20  0  JO33de  2  G4FRE  IO82uc  591  262
2013-01-03 22:22  G3ZJO  0.475714  -29  1  IO92ng  0.005  G4FRE  IO82uc  98  260

PA0A was still there this morning:-

2013-01-04 11:50	PA0A	0.475700	-24	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 11:32	PA0A	0.475700	-26	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 10:54	PA0A	0.475700	-25	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 10:36	PA0A	0.475700	-19	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 10:28	PA0A	0.475700	-24	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 10:20	PA0A	0.475700	-26	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 09:36	PA0A	0.475700	-24	JO33de	2	G4FRE	IO82uc	591	262
2013-01-04 09:28	PA0A	0.475700	-25	JO33de	2	G4FRE	IO82uc	591	262

Time to think about a real antenna for reception.

↧

MLA2500B Still works

January 8, 2013, 9:06 am

≫ Next: KPA500 Built

≪ Previous: 477kHz WSPR on a non optimum antenna

Before returning the power attenuator to G4BVY I looked round the shack to see if anything else needed testing. Eyes fell upon the Dentron MLA2500. This was bought at a Weatherford hamfest for the sum of $100 and was restored as described at http://g4fre.com/mla2500b.htm It was brought as checked baggage from the USA in mid2007 but has not been used since. It was turned on and left with heaters only for an hour. Then the EHT was turned on without incident. Trying it on 40m, but not pushing it too hard 60W in produced 700W of output, on 15m similar results. It still seems to work!

↧

KPA500 Built

January 18, 2013, 8:42 am

≫ Next: KAT500 In motion

≪ Previous: MLA2500B Still works

Finally got round to building the KAT500 I ordered last May, delivered at the end of December

Basically it took an hour to bolt it together, with no real issues
Just need to find an exciter that gives more than 10W to try it out.

↧

KAT500 In motion

January 24, 2013, 6:00 pm

≫ Next: Raspberry Pi Laptop!

≪ Previous: KPA500 Built

Thanks to W5LUA I got to borrow his FT847 to try out the KAT500 with 100W drive. The FT847 cannot provide band data for the KAT500 but as it measures the incoming RF frequency it should be able to work out what band the FT847 is transmitting on

Firstly I tried it on my HF6v vertical which is resonant on 80/40/30/20/50/10m. On 80m, the vertical , who's bandwidth is low is resonant on 3560kHz but the KAT500 gave a good match up to 3800kHz. The KAT500 also managed to match the vertical on 17m and 12m.

The ATU is quite noisy while tuning as relays are switched in and out. Tuning is normally achieved in under 5 seconds

Secondly I tried it on my Alpha Delta DX-EE antenna which covers 160/80/40/30. It is very narrow bandwidth on the lower two bands but the ATU managed a match over a wide bandwidth. It also managed to match the antenna on 20/17/15/12/10

The ATU needed around 9W for it to reliably autotune.

↧

Raspberry Pi Laptop!

January 27, 2013, 6:08 pm

≫ Next: WSPR on the RPI/Lapdock under Raspian Revisited

≪ Previous: KAT500 In motion

Although the RPI is small, by the time keyboard, mouse and HDMI display has been added its quite a big setup

Searching the internet I found information http://kimondo.co.uk/raspberry-pi-modmypi-case-motorola-atrix-lapdock-raspberry-pi-laptop/ on how to use a Motorola Atrix Lapdock as a display/keyboard/display for the RPI. They were originally intended as a "docking station" for the Motorola Atrix Android phone and cost around $250. They never really caught on, so they are available on the internet for a greatly reduced price, I paid $50 (shipped) for mine.

The unit has an external charger for the onboard battery, which can be used to power the RPI. On the back panel are a pair of FEMALE type A USB connectors, a MALE micro USB connector and a MALEmicro HDMI connector.

3 cable systems are needed for the RPI:- USB, Power and HDMI

I managed to source a female to female micro HDMI adaptor and a short MALE micro HDMI to MALE regular HDMI connector that plugs into the RPI. HDMI socket

I also obtained a FEMALEmicro USB to MALE type A USB cable which allows me to take care of the RPI USB connection

I then assembled the power cable harness. I used another FEMALE micro USB to USB cable and spliced into it a MALE micro USB connector cable that plugs into the RPI power connector

All was all connected together, an SD card with the latest debian release was inserted, the Lapdock saw the HDMI activity and the display showed the RPI boot sequence. Success!

When finished booting, I then plugged in the USB wifi adaptor that normally fits into the RPI into the USB connector on the back of the Lapdock. and rebooted. It connected fine to my Wifi so we were in business

To test the Video quality i installed XBMC on an SD card and configured it

I then looked at tidying up the cables. Accidentally I found out that if a micro female USB connected to the lapdock was connected directly to the regular sized USB port on the RPI the RPI was powered up AND it still saw the USB wifi dongle on the Lapdock

↧

WSPR on the RPI/Lapdock under Raspian Revisited

January 28, 2013, 8:24 pm

≫ Next: WSJT on the RPI/Lapdock under Raspian revisited

≪ Previous: Raspberry Pi Laptop!

Having got the Lapdock working I decided to install the latest debian package and reinstall WSPR

2012-12-16-wheezy-raspbian so that was downloaded and installed. At installation time I took the opportunity to overclock the board at 1GHz and in the same menu allow the memory space to fill ALL the memory card (if you dont, you only have 2GB to use, even on a 16GB card!

sudoapt-get update

sudoapt-get install build-essential subversion python2.7-dev python-numpy python-imaging-tk python-pmw libportaudio2 portaudio19-dev libsamplerate0-dev gfortran cl-fftw3 python-dev lib-hamlib-utils
svn co http://svn.berlios.de/svnroot/repos/wsjt/branches/wspr -r2840

(trying to load the current revision ie ommitting "-r2840" software wouldnt build)
cd wspr
./configure &minus;-with-portaudio-include-dir=/usr/include &minus;-with-portaudio-lib-dir=/usr/lib/arm-linux-gnueabihf

At this point the Makefile that configure created needs to be edited so the RPI uses the hardware floating point processor

vi Makefile (edit wouldnt work on my machine on this file)
make sure line 5 reads:-
FFLAGS = -g -O2 -fno-range-check -ffixed-line-length-none -Wall -Wno-character-truncation -Wno-conversion -Wtabs -fPIC -mfloat-abi=hard

make sure line 9 reads:-
CFLAGS = -Wall -O0 -g -Wall -O0 -g -mfloat-abi=hard

sudomakeinstall

to launch wspr

./wspr

Again i used the imic as the audio input/output

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: system [iMic USB audio system], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: system [iMic USB audio system], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

works fine, nice to have a compact system for wspr

↧

WSJT on the RPI/Lapdock under Raspian revisited

January 30, 2013, 7:42 pm

≫ Next: A replacement for my Raspberry Pi

≪ Previous: WSPR on the RPI/Lapdock under Raspian Revisited

While comissioning the Atrix Lapdock I needed to install WSJT. I had similar issues with the version currently at the trunk of the svn not installing properly, There were no clues on the SVN as to what the latest stable release was so I found out what version I had previously used (2589)and installed that as follows:-

svn co svn://svn.berlios.de/wsjt/trunk -r2589

cd ../trunk

./configure --with-portaudio-include-dir=/usr/include --with-portaudio-lib-dir=/usr/lib/arm-linux-gnueabihf

it did a whole load of things starting at "Compiling wsjt" and ended with "Installing into: /usr/local"

still in trunk:-:

make clean

make

after it finishes make sure you have permissions to execute ../trunk/wsjt.py:-

sudo chmod 777 wsjt.py

Even though the serial port isnt used, WSJT still tries to talk to it so make sure /dev/ttyAMA0 permissions are set appropriately

to launch WSJT:-

./wsjt.py

↧

A replacement for my Raspberry Pi

February 1, 2013, 7:29 pm

≫ Next: Picuntu on the MK808 part 1

≪ Previous: WSJT on the RPI/Lapdock under Raspian revisited

While researching other uses for the Atrix lapdock I came across some android based TV players. They are often referred to as "Mini PC on a stick"! as they are only slightly larger than a USB thumbdrive. They had USB ports (mini usb connectors) for peripherals, onboard WIFI and an HDMI output (mini HDMI connector) for connecting to a TV. They are intended to stream Video from the internet and display them on a TV. There was a selection at www.geekbuying.com Initially I looked at the MK802 which had a Allwinner A10 ARM Cortex-A8 processor for $45 but then a spotted the MK808 which for just $10 more ($55 shipped) had a Rockchip Dual-core Cortex A9 RK3066 CPU. So I ordered one.

It took 10 days to arrive from China. and was supplied with PSU and all the needed cables. It had Jelly Bean Android 4.1 build loaded and didnt take long to get it up and running. It normally sends audio out of the HDMI connector to the TV but has no provision for audio Input. Luckily it recognised my Ipad's IMIC so it was soon working on Skype with very good quality video conferencing.

I then spotted that there is a version of Ubuntu for the MK808. called Picuntu. Its getting even more interesting!

I may get to replace the "huge and underpowered" raspberry Pi! I have already seen one person using it with a TV dongle to stream ADS-B signals consuming less than 10W!

↧

Picuntu on the MK808 part 1

February 5, 2013, 7:00 pm

≫ Next: Picuntu on the MK808 part 2

≪ Previous: A replacement for my Raspberry Pi

Having had a play with Android on the MK808, I decided I needed to install Ubuntu so I could install WSPR and WSJT

Searching the net I discovered there is a reduced version of Ubuntu 12.10 called Picuntu see .http://ubuntu.g8.net/ that can be used with the MK808. You put Picuntu on a micro SDHC having declared it as a recovery device and boot from it, so you can still use it on Android

I also discovered there is a version of Android that can be loaded on the MK808 that has some improvements, has the code to boot from recovery, has root priveledges, has "reboot from recovery" built in, and makes more memory available. see http://www.freaktab.com/showthread.php?3207-NEW-MK808-Finless-1-6-Custom-ROM. It was installed with the instructions in the ROMS readme file. When the MK808 was booted it came up in Android mode and it had wifi once i made sure the wifi interface was eth0

Next it was time to write the picuntu image to the microsdhc card. I found a technique at https://www.miniand.com/wiki/Picuntu+Linux--2-Creating+the+linuxroot+filesystem. Put the card in the MK808 slot, rebooted in recovery mode. It objected saying damaged card. Powered off, tried again same problem. Lots of messing around until it finally rebooted into Picuntu, the only issue was there was no sign of Android any more! The rterminal window didnt fit the TV screen (command line was 6" off bottom of screen) which was a challenge and no wifi. Lots of things were tried to get wifi until i came across a posting on http://code.google.com/p/rk3066-linux/wiki/PicUntu:-

@alxkos Without quotes,

write "bcm40181" to /etc/modules,

then change /etc/network/interfaces to :-

auto lo iface lo inet loopback

auto eth0 iface eth0 inet dhcp

wpa-ssid mySSID

wpa-psk myPassword

Reboot.

To reconnect type in terminal: sudo service networking restart

This worked and no i had wifi to do apt-get update. I also tried to install gnome desktop, but after 2 hours it installed, looked ok, but when it rebooted it complained it was running in low res, gave me some boxes to click on to try and fix the issue but none could be clicked on. Same issue when i rebooted. Time for a rest!

↧

Picuntu on the MK808 part 2

February 6, 2013, 7:20 pm

≫ Next: WSPR on the MK808 under Picuntu...Not Recommended

≪ Previous: Picuntu on the MK808 part 1

First thing to fix was to get Android back. Luckily the original rom image for the MK808 is available at http://tabletrepublic.com/forum/mk808/mk808-firmware-download-3065.html so I applied that to the MK808 using the procedure they state and Android was back up and running.

I then took a further look at the miniand,com web site especially the complete process document. https://www.miniand.com/wiki/Picuntu+Linux+Step+by+Step+Installation so I went all the way through, installing their recovery image along the way

Booted the MK808 in Android. opened terminal window, did "su" followed by "reboot recovery" and it started to boot in what looked like Ubuntu. Again no wifi, fixed using the process in the previous post and command line was off bottom of screen. Did updates, still no joy

I did try the "faulty image" sd from last night and it booted fine, but still had the same issues

Searching the web I then came across an 8GB image of picuntu RC0.9 "picuntu-linuxroot-0.9-RC2.2.img" which had everything already in the image. Tried burning it to an 8GB micro sdhc card, using win32 image writer but it refused. saying card was too small. Tried a patriot sd card, same issue. Luckily I had a 16GB card so I put the image on there without problem.

Powered up in Android, did reboot recovery and up came Picuntu, with the Xubuntu desktop displaying a picture that fitted the screen. Opened terminal window, could actually see what I was typing. Progress indeed.

Good news was that when rebooted the MK808 came back up in Android. Quit while ahead, WSJT and WSPR can wait until tomorrow!

↧

WSPR on the MK808 under Picuntu...Not Recommended

February 12, 2013, 6:36 am

≫ Next: 40m WSPR on Valentines night

≪ Previous: Picuntu on the MK808 part 2

Time to try WSPR on the MK808 under Picuntu. Using the same method as previously used it installed without issue. I plugged in the IMIC and let it run on 20m

First thing I noted was that the waterfall display was flickering and alternating between two completely different displays. The second thing i noticed was that the "sound card calibration values" at the bottom left of the screen were not at their normal 1.00 ish but were at around 0.5. Not surprisingly I got no decodes. I tried adjusting a whole load of settings but still no decodes. I tried the IMIC under Ubuntu and it worked fine. Time to move on to other projects.

The other issue with Picuntu is its screen resolution. It ONLY supports 1080P mode so if you have an HDMI display with any other resolution it looks terrible, text looks particularily badly defocussed. Especially bad was.the display when I hooked the MK808 up to the Lapdocks HDMI input.

↧

40m WSPR on Valentines night

February 15, 2013, 6:25 am

≫ Next: Practical Wireless becomes unobtanium?

≪ Previous: WSPR on the MK808 under Picuntu...Not Recommended

I thought for a change I would run the FT817 on wspr overnight on 40m and see where it could be seen. Im pressive results, especially DU1MGA for a new country on this mode

↧

Practical Wireless becomes unobtanium?

March 30, 2013, 8:16 am

≫ Next: August 1943 P.W.easier to get than April 2013 one!

≪ Previous: 40m WSPR on Valentines night

The April 2013 was supposedly published Mar 14. I duly looked at the local newsagent the following Saturday , no sign of it. They phoned their suppliers who said they had none. Had to visit central London the following Tuesday, tried two different newsagents, same story. Tried the local shop again Mar 23 and Mar 30, the warehouse was still attempting to get them from the Publisher. If its going to be this problematic, time to give it up after reading it for 50 years?

↧

August 1943 P.W.easier to get than April 2013 one!

April 1, 2013, 8:49 am

≫ Next: 70MHz followed by HF JT9-1

≪ Previous: Practical Wireless becomes unobtanium?

Today we went to the flea market at the Three counties showground near Malvern. It was very cold, but was still very well attended. They had ran out of gas for heating so the indoor areas were just as cold as the outside stands. Saw a couple of valve radios including a 6Volt mobile radio that I was tempted with but resisted. Nothing exciting UNTIL! On one of the indoor stands, on a shelf at ankle level, were a stack of 1940s Practical Wireless! There were 20 of them from Aug 1943 through Mar 1946. 50p per copy got them (cheaper than current back issues!). Skimming through there are some interesting articles including a receiver for 5 to 50m that uses a valve that I inherited from my father in law, G3AUA's estate. I can see a project coming on

↧

70MHz followed by HF JT9-1

April 7, 2013, 2:09 pm

≫ Next: ANAN-10 With CUSDR, 4 receivers at once

≪ Previous: August 1943 P.W.easier to get than April 2013 one!

Spent the morning on 70MHz for the contest. I used the K3 and the DEMI Xverter to a Halo in the loft. Surprised to work 15 stations the best DX being G4FZN/P at 248km. There was only one escapee G4TSW.
After lunch I decided it was time to try the new JT9-1 mode. I installed WSJT-X on my D945CLF2 atom motherboard computer and selected the usual MME audio inputs and outputs. Monitoring the audio output it sounded alright to it was time to try it on air

First 30m Heard RY6KM so I called him with my 5W and he came straight back. Also worked OE6ESD and OE3EPW. Intrigued by not needing Directx audio drivers as mentioned in G4VXE and G4ILO in their blogs I installed WSJT-X on my Dell laptop and deployed the regular audio input and output. Switching to 20m I decoded ZD7JC who came right back to my 5W call. I dont seem to need Directx audio

I looked at http://hamspots.net/history/ and saw I was getting out reasonably well on both 30m and 20m:-

The map view from http://pskreporter.info/pskmap.html also shows I was getting out:-

↧

ANAN-10 With CUSDR, 4 receivers at once

April 8, 2013, 10:21 am

≫ Next: 28MHz WSPR 25 November

≪ Previous: 70MHz followed by HF JT9-1

I had previously tried the DL3HVH CuSDR 32 bit on a couple of my computers without success, mainly due to the unavailabilty of Opengl 2.0 video driversmachines

I have a fairly recent dual 2.2Ghz core processor computer which has windows 7 on it so I thought I would try it on that. It installed without incident and I was impressed by the result

The following shows a spectrum view of four bands 40, 30, 20 and 15m. Each shows 192kHz bandwidth. One band can be demodulated and heard

↧

28MHz WSPR 25 November

November 25, 2012, 7:48 pm

≫ Next: Hermes in motion

≪ Previous: ANAN-10 With CUSDR, 4 receivers at once

Even despite a late start:-

↧