SWL I1-14748 since 1960's and licensed OM since 1969 with original callsign I1EFO.
ARRL DXCC Honor Roll award since 1996.
Rarely I use vintage equipments manifactured in USA from 1945 up to 1962 operating on CW/AM or old "phasing method" SSB generation and old transceivers with "crystal filter" SSB generation FPM300 (1974) and Swan 350B (1977). I'm first classified on "International Vintage Contest HF" 4°, 5° and 6° Editions (years 2011, 2012 and 2013) cat. A/SOS-1959 with Heath SB10 transmitter and Hallicrafters S-107 receiver.
On digital modesnow I'm using an old Yaesu FT747GX manufactured year 1987: I prefer JT9-1 and WSPR modes. Since 10 september 2013 I'm using my FT747GX on 630 meter band JT9-1 and WSPR-2. You can see last day's photo of my call at DL1DBC's WSPR monitor (distance 855 km). Most of my WSPR activity is around earth's grey-line time.
For 472 kHz activity I'm using the FT747GX transceiver with a "MF Solutions" TX down-converter (tnx John WG2XKA) with output no more than 12W and an inverted-L antenna with about 1:1 SWR (measured with avintage AlliedZ-bridge and BW Matchmaster) matched by L-network with vintage Péricaud variometer coiland 4500pF in parallel with the coax feed. I get 0.6A aerial current (measured with a vintage Triplett thermocouple ammeter) which is what I reckoned was needed for 0.5W EIRP. On reception I added at FT747GX a Yaesu FRT-7700 preselector and an homebrew digital active band-pass audio filter based on Switched Capacitor Filters (SCF) MF10 CMOSmanufactured by Texas Instruments.
You can see my best 472 kHz WSPR trasmission activity at http://wsprnet.org/olddb?mode=html&band=2190&limit=2500&findcall=i5efo&findreporter=&sort=distance.
For VLF, LF and MF reception I'm using also 400 meters long electric-fence as "U-Beverage" antenna, matched with 9:1 balun and 450 ohms termination resistor, and Cushman CE-24E selective levelmeter receiver.
See call IW5EFO of my last son Daniele (MD), together my first son SWL I5-2701-FI Gabriele (Lawyer), at http://www.qrz.com/db/iw5efo site too.
Last modified: 2013-12-08 08:55:33, 3204 bytes cached
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