QRZ.COM
ad: M3ZGS-1
Please login help/register callsign: password: secure login
Database News Forums Swapmeet Resources Contact
 04:41:49 UTC 20 Dec 2014 
Advanced Search Current Hot Callsigns XML Logbook Data QSL ListMaker Database Downloads DX Spotting Network Ham Club Database QSL Corner Top Web Contacts Expired Callsigns QRZ's 1993 FCC Database Daily Update Reports Just Added Callsigns Database Help Forum
Amateur Radio News General Announcements Special Events, Contests, etc. Hamfests and Conventions Silent Keys Headlines
Forums Home Discussions, Editorials, Talk Technical Forums Logging and Contesting RV and Mobile Help Forums
Ham Radio Gear for Sale Ham Made Gear General Merchandise Swapmeet Hot List Ham to Ham References Stolen Radios, Scams and Rip-offs
Site Menu... Practice Amateur Radio Exams Amateur Radio Study Guides Online License Renewals License Wall Certificates Commercial Ham Radio Links DX Country Atlas Grid Mapper Ham Radio Trivia Quiz Life Member Honor Roll
Help Desk, for accounts, lost passwords, etc. Add your callsign to QRZ Subscription Services Users Help Forum Frequently Asked Questions - FAQ QRZ en Espanol Privacy Statement Advertise with QRZ List of Current Advertisers About QRZ Donate to QRZ Contact us
ad: L-HROutlet
ad: l-assoc
ad: l-tentec
ad: l-Waters
ad: l-WarrenG
ad: l-rl
ad: l-innov
ad: l-gcopper
ad: l-Heil
W4TTU USA flag USA

Login is required for additional detail.

Email: Login required to view

XML Subscriber Lookups: 7792

 

DN54 QSL Confirmation:

Direct only please with SASE

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!


Beacons

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


WSPR

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

1496902 Last modified: 2014-12-05 11:24:15, 24417 bytes

Login Required

Login is required for additional detail.


Apply for a new Vanity callsign...

You must be logged in to file a report on this page

Please login now...

Currently updating logbook display.
ad: giga-db
Copyright © 2014 by QRZ.COM
Sat Dec 20 04:41:49 2014 UTC
CPU: 0.050 sec 60707 bytes mp