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FM5GB Martinique flag Martinique

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Platinum Subscriber Lookups: 10935

Beaming US west coast


Antennas :

-Cushcraft log periodic ASL 2010 (20 thru 10 m)

-Cushcraft 5 elements 6 meter beam

-Quarter wave sloper (80 m)

-Fritzel FD4 windom (40 m)

-B & W folded dipole (30 m).

-Loop ALA 1530 and ALA 100LN (21 m loop)by Wellbrook (for VLF & LF DXing)

-On roof mounted 2.3 kw solar panel array.

I was first licenced in France in 1980 (call was F6GOC). When I moved to the Caribbean in 1991 I got my actual callsign FM5GB but I haven't been active until 2010 when I changed the hobby : I stopped most of my scuba diving activities (I'm still an **CMAS instructor) and came back to Ham radio. I operate mainly phone and digital modes, but my strongest interest is LF and VLF dx-ing. I have a great log filled with Airport beacons and DGPS stations ranging from Northern Canada to Southern Brazil and few Europeans.

QSLing : by eQSLcc or direct (QSL's are printed & now being sent out monthly).

SWL reports welcome.

Sorry no bureau membership !.

Please include Self adressed Envelope and return postage if possible (my local post office does not accept IRC's).

Answering CQ calls is the way I operate most of the time.

73's to everybody, hear u soon or see u on my waterfall !

Another view of the 50 foot-15 meter tower (CTA self supporting, tilt over & crank up made in France) which I had to crank down because of a wind damage; and the solar panel mounted on the roof.


Big multiple weekend project : reboxing  the Anan 200D into a home made enclosure...


Completed enclosure before assembly (dimension is rack 19" x 4) Lots of cutting, filing, drilling and taping

The 100 w PA unit sitting on its new heat sink with double fan cooling underneath.

Two fans for the 100 w PA and one for the power supply unit.

Internal layout

Orion board

PTT buffering, Line in circuitry from balanced to unbalanced.,Pure Signal sample switching thru a coax relay.

The power supply with low noise regulators providing 12, 5 & 3.3 V to the Orion board.

GPS disciplined oscillator by BG7TBL, yields ultrastable 10 MHz clock reference for the SDR Orion board.

Front view (has changed slightly from the first design)

Rear panel. You notice the Anan blue. PS is the Pure Signal sample input from the amplifier. GPS antenna input at left.

Left side warm air exhaust

It works : GPSDO locked, power voltage 13.801 vdc ! Mike signal goes thru DBX balanced preamp. No more birdies from any switching power supply, no more RFfeedback even with a kW ouput into the antennas which are just over the shack ceiling.


The equipment presently :

- EX-Anan-200(D) SDR transceiver from Apache Labs made in India transplanted in a new home made aluminum box, with new linear power supply; balanced line input, PTT buffer circuitry, GPS DO module, lots of shielding and improved cooling for the final amplifier.

- Expert 1K-FA linear amplifier from SPE Italy (fully automatic amp, antenna switch and ATU)

- Perseus direct sampling SDR receiver from Microtelecom Italy (0-30 MHz).

- Excalibur G31DDC direct sampling SDR receiver from Winradio Radixon Australia (0-30 MHz)

The big black box on top is a linear power supply wich replaces more than 10 little PSunits for all

SDR receivers, and various accessories (the piece is very heavy and huge because home made!)

The SDR, the 1K-FA linear, the Perseus receiver and all digital decoding  and logging programs follow the frequency thru DDUtil ( http://k5fr.com/ddutilwiki/index.php?title=Main_Page). Rotator is controlled thru EA4TX interface with a mouse click in HRD rotator.

The computer is Intel I7 quad core @4.0 GHz (slightly overclocked); 8Gb ram 0.5Tb SSD  Win7 64 pro. It will run all SDR gear simultaneously (<30 % processor use) with no dropout and still lot of headroom for future extensions !

Best  73s  from  FM5GB   !

6837980 Last modified: 2015-11-07 16:58:07, 6520 bytes

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