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4X1DA Israel flag Israel

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First licensed in 1976 when I was in high school, I've been facinated with radio and everything relating to RF ever since. My main interests in Amateur Radio include experimentation, propagation and QRP operationNearly all of my HF activity is on digital modes, primarily - WSPR, JT65 and JT-9 - running usually <10W. HF antennas currently include a 20M delta loop, 40M inverted-V and a beverage for MW DX.

The ability of WSPR to decode signals with a SNR as low as -28 dB in a 2500 Hz bandwidth is extraordinary (the actual WSPR signal is just 6 Hz wide). My 1W (30 dBm) WSPR beacon was recently heard in ZL, a path of over 16,000 kms, with a SNR of -21 dB, meaning there was still 7 dB of margin left to lower my power even further and still be heard - amazing!

Primary HF receiver is the WiNRADIO G31DDC/G33DDC 'Excalibur' Software Defined Radio (SDR). Coupled with DF8RY's CSVUserlist Browser/Database utility over separate 24" monitors, for SW listening, it doesn't get any better!

Above 30 MHz I use an RTL-SDR; essentially a $20 DVB-T dongle which uses a custom driver to provide multi-mode reception from 22-2200 MHz. My favorite software for the RTL-SDR is SDR# (SDR Sharp) which I use with a number of useful plugins.

HF xcvrs include an ICOM IC-7200 for digital modes and a Yaesu FT-950 for SSB/FM.

Update, April 2016:  Deteriorating  HF conditions has forced me to 'QSY' to VHF and UHF.  Having lots of fun with a Raspberry Pi based simplex AllStar Node #42973 on 439.1 MHz (PL 91.5). Also active on DMR where I'm usually listening on US Nationwide TG4639/3100.  

The ruggedized MIL-SPEC Pelican case shown in the photos above goes everywhere I go. Hence, friends and family have knicknamed it 'The Football'. It contains two DV Hotspots (A DV4Mini and a DV-MEGA), an AllStar Link Node based on a Raspberry Pi, a Hytera PD-365 for DMR and a Yaesu VX-6 for AllStar.  A combination of any two DV modes (DMR/D-Star/C4FM/P25) + AllStar, can be supported simultaneously. A RAVPower 26,800 mAh battery bank and a 15W solar panel provide continuous power for days at a time. All equipment is powered from standard USB connectors at 5V. 

Click here to scan some of the TGs I'm usually on.

If you need a QSL card, please use eQSL only.

Best 73 and hope to 'see' you on the bands soon!




 >16,000 km path with just 1W (30dBm) on WSPR

 12-Hour snapshot of 20M from WSPRnet - Stations hearing 4X1DA's 1W WSPR beacon (April 24-25, 2014)

 WiNRADIO Excalibur G31/G33DDC in 0-30 MHz Spectral Display Mode

 Screenshot of CSVUserlistBrowser Utility. AOKI/Nagoya, EIBI, HFCC, FMSCAN and DRM databases are updated daily

 Harris RF-590/RF-551A HF Receiver/Preselector -  The Workhorse

SDR# with RTL-SDR/e4000 Front End (Newer DVB-T Dongles use the R820T Tuner IC capable of RX 24-1700 MHz )


SDR# with Fast Scanner' plugin. Green bars=known (in the database), blue=unknown and red=locked-out channels

Free counters!


7780809 Last modified: 2016-12-24 16:43:32, 10086 bytes

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