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DN54 QSL Confirmation:

Direct only Please

Mail to:

                    Robert Bratton

                    1220 Sage Brush ST

                    Cody, WY 82414


Summer QTH (DN54):  stop by for an "807", we can go fishing, rockhounding, or do some flint knapping!


W4TTU-15 two watt FSK 30 meter mobile GPS APRS beacon

W4TTU/B 10 watt 6 meter CW propagation beacon (50.069.4 MHz) operating from Northwest Wyoming DN54LM

Map: BEACONSPOT.eu BEACON SPOTS MAP for 6 meter W4TTU/B updated July 19, 2012


W4TTU/B 2 watt 30 meter CW propagations beacon (10.125.4 MHz) operating from Northwest Wyoming DN54LM

IARU Region 2 approved for continuous operation


Homebrew 40 Meter WSPR (Weak Signal Propagation Reporting) beacon (USB exciter). RF output is 100 mw.

Map image copied from WSPRnet:  shows what 100mw with a dipole can do on 40 meters.


Field Day 2011







Battery/solar 5 watt CW 40/15 meter operation at Red Lake near Cody, Wyoming. A gorgeous Sunday morning!

G0KSC 3 element LFA Yagis for 6 meter FSK441 meteor scatter

Boom and elements are sectional for easy takedown and trunk storage, boom pigtail length left for future construction.


Homebrew 6 meter Moxon antenna: using CPVC and arrow shaft construction

Construction permits quick take down for portable use.  A good performer and easy to tune.  Left photo shows coax feed point and one adjustable corner.  CPVC sections are friction fit and not cemented.


1.8-54 Mhz QRO Low Pass Filter by K8CU (QST Nov. 2002 and ARRL Handbook 2009) a great filter!

WA4NJP and W7GJ QRO coaxial transfer box for switching a power amp in and out.







Homebrew two pole helical filter for 2 meter APRS digi receiver front end, path loss < 1 db with sharp semetrical skirts.


Sterling, Virginia AMSAT ECHO Ops with Yaesu FT-470 HT and Arrow 144/435 Mhz antenna


J-pole antenna showing hose clamp RG-8 coax feed.

J-pole used with sun powered W4TTU-10 APRS

Digi site in Cody, Wyoming:  same antenna with homebrew wind turbine and Maggie my border collie


Sugarland Run, Virginia APRS i-Gate hardware: Argent FC-301/D data radio, Kantronics KPC-3, and RF Concepts 2-23 RF Amp.

Typical monthly reported positions packets to APRS-IS ~ 75,000.  Typical receiver range ~ 62 miles.


Homebrew 40 Meter 5 watt CW QRP rig. The receiver section is a direct conversion autodyne type.  Great back pack rig, the key is a modified micro-switch and the antenna is a dipole with voltage balum using light duty Belden 8218 75 ohm coax. The antenna works well when used as a slanted dipole.  The bar graph serves as a power out (matching) indicator.










Microstrip silicon bipolar transistor (AT-42085) noise figure test jig. An optium noise match near 50 ohms makes for easy matching with this transisstor.

10 watt BP solar panel use with APRS sun pwr W4TTU-10 digi in Cody, Wyoming.



Lynn, K7IKO, going for the top in two (2)meter APRS j-pole install, Cedar Mtn. near Cody, Wyoming.

Thirty (30) meter PSK-31 slant dipole with ice accumulation in northern Virginia.


30 meter dipole voltage balum secured in 1.5 " PVC end cap. 60 watt wind turbine with PVC blades and Powermax stepper motors.


Original design 435 Mhz satellite pre-amp, about as good as it gets for noise figure, <.3 db. Features enhanced mode PHEMT ATF-54143 with Omron stripline RF relay, 6 db microstrip output padding, pin diode front end shunting during transmit, and single coax feed. Pre-amp provides 20 db of linear gain.

Hardware on right is Argent SRB MX146 low cost programmable VHF transmitter wired for APRS use. Pigtail leads connect to a counter on a bucket rain collector. The 9 pin D connector connects to an open tracker + APRS tracker.

73, Bob W4TTU

1654308 Last modified: 2015-01-31 10:16:30, 24407 bytes

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