Cookies help us deliver our services.

We may use session cookies for technical purposes such as to enable better navigation through
the site, or to allow you to customize your preferences for interacting with the site.

By using our services, you agree to our use of cookies. OK
home QRZCQ - The database for radio hams 
 
2019-12-13 08:22:34 UTC
 

Call:

   Advanced
 

Call:

  

Pass:

  
 

or

 
K0ZR

Active QRZCQ.com user

activity index: 0 of 5
sticker

Jeff Crawford

Purcellville 20132
United States, VA

NA
united states
image of k0zr

Call data

Last update:2017-04-17 22:24:59
Continent:NA
Views:1747
Main prefix:K
Class:Extra
Federal state:VA
US county:Loudoun
Latitude:38.7661800
Longitude:-77.6149500
Locator:FM19DB
DXCC Zone:291
ITU Zone:8
CQ Zone:5
Website:www.k0zr.com
ULS record:232488

Most used bands

40m
(30%)
20m
(25%)
15m
(16%)
80m
(13%)
160m
(10%)

Most used modes

CW
(91%)
SSB
(10%)

QSL data

Last update:2015-03-02 17:42:50
eQSL QSL:YES
Bureau QSL:YES
Direct QSL:no
LoTW QSL:YES

Biography

I am an electrical engineer by day and an amateur operator as much of the remainder of the day as possible. My principle areas of specialization are in digital communications, RF, and microwave hardware and systems.

Increasingly I add to my station through my other interests in steel work. I have built my operating desk, tower raising/lowering fixture, base for the 80m free-standing vertical, and other miscellaneous fixtures to hold/store aluminum tubing and other antennas. My next "large project" is to design and build one or possibly two fixtures to allow tipping over of Rohn 55 tower at about the 40 foot level, allowing one to work on antennas with feet on the ground. Each tower would be 80-90 ft tall, hinged at the 40 ft level.

Worked DXCCs:

Equipment

Very briefly, I operate almost exclusively CW on the HF bands. Antennas include Force12 C31XR for 10, 15, and 20m at 22m and a Cushcraft XM-240 for 40m at 24m high. Use a ~ 55 ft free-standing vertical with 90 radials for 80m and inverted-L at 80 ft for 160m. Also use the DX Engineering active antenna four-square for receive on 160m and 80m.

Station equipment includes Tentec ORION II and Centurion amplifier, and an Elecraft K3 and Alpha 8410 amplifier. Use a Bandpasser II filter on each radio, as well as the Tentec 438 tuner on each radio as needed. I use the Array Solutions 2 x 8 remote RF switch to complete my SO2R station. I am in the process of designing and building 2 KW bandpass filters to help mitigate harmonics and in general, strong signals, for my SO2R setup. So far I have completed filters for 20, 40, and 80, with the other three bands hopefully completed by fall 2017 for contest season. Each filter is a 5th order elliptic, championing as needed Norton Transforms, providing generally in excess of 60 dB loss to the neighboring bands, i.e. band below and band above.

  

Site Rev. 18332