SD-20 Mast Support
took this picture of my SD-20 from World Radio Magazine
holding up one end of a 40m dipole. The other was in a tree and it was
fed with LMR-240.
I heard N9OHW calling CQ on 18.070 599+ and answered but it turned out Mike was in Mountain View near Moffett Field, about 3 miles from
my house! He was on an ICOM-706 MK 3 and a vertical 10 ft up.
I let Mike go chase DX...pretty funny!
Addendum: I heard via e-mail from Mike that he was back on the air today first time after a ten-year hiatus, and had just bought the rig!
Sunol Regional Wilderness
These are the pictures I took.
and Bill K6ACJ
, Tarantula, Bill K6ACJ
(call?), and Oliver KB6BA
That's the 60M counterpoise I borrowed from Bill running vertically just to the left of the tarantula.
Sunol Regional Wilderness
came up from Huntingon Beach, CA and he and Ken
and Oliver KB6BA
planned a trip to the Sunol Regional
Wilderness and invited me along. Oliver brought his sister and
brother-in-law, who had just arrived from Germany.
We set up at the the of the hill, and I loaned Bill my SD-20 pole for
one end of his 40m dipole and he threw the other end in a tree.
I set up a Pac-12 for 30m and 40m and Bill loaned me some wire to clip
onto it, and that got it to load up to about 2:1 on 60M with the 40M
coil and Z100. I talked to Alan W6BZQZ, who suggested I try the
balun he designed. I did, and at the 50 Ohm (1:1) position it seemed
to get a better match, according to the Z100, but there wasn't a big
change in the received results according to Alan. He could something
at 1 Watt, but we couldn't have a QSO until I used the K5OOR
HFPacker Amplifier off of the 9.5AH NiMH cells I got from HamStop, and that worked fine.
I didn't make any contats on 40 or 30...it seemed like 60M was the
only band where we could work anybody, though Bill started (but
couldn't finish) a couple of QSOs on 7109.
A tarantula came through and caused a bit of excitement; I encouraged
it to leave and it did. It was so camouflaged I was afraid we would
step on it in a clump of the dry grass.
We packed it up before sunset and headed to a local restaurant.
Here are some pictures that Bill took.
Second draft of vacuum mold design for clear Lexan clamshell cover for my
. Looks like
$20-$25 in qty 50. The part would be vacuum molded inside this, so it would wind up looking like the inside of this mold.
First SSB DX QSO with HFpacker Amp!
I talked to Lucio IK6SNR about 200 km from Rome in Central Italy on 14.210. He gave me a 5x5 and I gave him 5x7. I was using the FT-817 and the HFPacker Amp into a G5RV.
QRA, Grid Square, Distance between Latitude and Longitude, etc.
;;; Routines to calculate
;;; - Maidenhead Grid Square (QRA, IARU Grid Square) from latitude and longitude
;;; - Latitude and longitude from QRA
;;; - Great Circle distance from grid square to grid square
;;; - Bearing from Grid Square to Grid Square
;;; Leigh L. Klotz, Jr. WA5ZNU
;;; Assembled from various places -- see comments.
;;; (qra 37.428833 -122.114667)
;;; This gives CM87wk which is correct
; (latlon "CM87wk")
; Gives 37.4375 -122.125
; (latlon "CM87wk")
; (haversine-great-circle-distance-miles (latlon "CM87wk") (latlon "QN16ix")) ; 4605 miles
; (haversine-great-circle-distance-miles (latlon "CM87wk") (latlon "JN62vu")) ; 6232 miles
(defun qra-dist (x y)
(haversine-great-circle-distance-miles (latlon y) (latlon x)))
(defun latlon-dist (lat lon)
(haversine-great-circle-distance-miles (latlon "CM87wk") (list lat lon)))
;; Note: All calculations in degrees
;; lo = longitude + 180 (offset origin to -180degrees longitude,)
;; La = latitude + 90 (-90 degrees latitude.)
;; C1 = ASCII CHAR ('IP(lo/20)+65')
;; C2 = ASCII CHAR ('IP(la/10)+65')
;; C3 = ASCII CHAR ('IP(FP(lo/20)*10)+48')
;; C4 = ASCII CHAR ('IP(FP(la/10)*10)+48')
;; C5 = ASCII CHAR ('IP(FP(lo/2)*24)+65')
;; C6 = ASCII CHAR ('IP(FP(la)*24)+65')
;; QRA Locator = String C1+C2+C3+C4+C5+C6
(defun qra (latitude longitude)
(setq longitude (+ longitude 180.0))
(setq latitude (+ latitude 90.0))
(+ ?A (floor longitude 20.0))
(+ ?A (floor latitude 10.0))
(+ ?0 (floor (* 10 (- (/ longitude 20.0) (floor longitude 20.0)))))
(+ ?0 (floor (* 10 (- (/ latitude 10.0) (floor latitude 10.0)))))
(+ 32 ?A (floor (* 24 (- (/ longitude 2.0) (floor longitude 2.0)))))
(+ 32 ?A (floor (* 24 (- latitude (floor latitude)))))))
(defun latlon (qra)
(let ((c1 (upcase (aref qra 0)))
(c2 (upcase (aref qra 1)))
(c3 (aref qra 2))
(c4 (aref qra 3))
(c5 (if (> (length qra) 4) (upcase (aref qra 4)) 0))
(c6 (if (> (length qra) 5) (upcase (aref qra 5)) 0)))
(- (+ (* (- c2 ?A) 10.0)
(* (- c4 ?0) 1.0)
(/ (+ 0.5 (- c6 ?A)) 24.0))
(- (+ (* (- c1 ?A) 20.0)
(* (- c3 ?0) 2.0)
(/ (+ 0.5 (- c5 ?A)) 12.0)) 180))))
;;; Great Circle distance and bearing based on Haversine formula
;; (from R.W. Sinnott, "Virtues of the Haversine", Sky and Telescope, vol. 68, no. 2, 1984, p. 159):
;; as described by N9SSA in
(defun haversine-great-circle-distance-km (latlon1 latlon2)
(let* ((k (/ 180.0 pi))
(lat1r (/ (car latlon1) k))
(lon1r (/ (cadr latlon1) k))
(lat2r (/ (car latlon2) k))
(lon2r (/ (cadr latlon2) k))
(dlonr (- lon2r lon1r))
(dlatr (- lat2r lat1r))
(a (+ (* (sin (/ dlatr 2.0)) (sin (/ dlatr 2.0)))
(* (cos lat1r) (cos lat2r) (sin (/ dlonr 2.0)) (sin (/ dlonr 2.0)))))
(c (* 2 (atan2 (sqrt a) (sqrt (- 1.0 a)))))
(d (* R c)))
(/ d 1000.0)))
(defun haversine-great-circle-distance-miles (latlon1 latlon2)
(* (haversine-great-circle-distance-km latlon1 latlon2) 0.621371192))
(defun atan2 (y x)
(if (or (= x 0) (= y 0))
(if (>= y 0.0)
(/ pi 2.0)
(- (/ pi 2.0)))
(if (< x 0.0)
(if (>= y 0.0)
(- pi (atan (- (/ y x))))
(+ (- pi) (atan (/ y x))))
(if (> y 0)
(atan(/ y x))
(- (atan (- (/ y x))))))))
The Thing That Ate My Antenna
My 28ft teflon/silver wire got wrapped in these and ii broke it trying to get it down.
On the way back tonight we stopped at my sister's (Ex-WN5UOE) in San
Luis Obispo, and I got out my KX1 and 10 NiMH AA's and threw a 16ft wire
on the floor and a 28ft wire across a few pieces of wrought-iron
furniture, out the window, and into a tree. Around 0600z I worked
ES5MC Arvo in Estonia on 14.030...he was a fluttery 559 and gave me a 519 on the 3rd call but considering my antenna I was quite pleased.
(haversine-great-circle-distance-miles (latlon "KO37mt") (latlon "CM95qg")) is 5733, divided by 4.5W is 1274 miles per watt.
I worked Rob KB7PWJ from the Queen Mary as W6RO/MM using an
FT-1000 to a 40-20-17-15-10 vertical on 14.0396...
Rob was using
his OHR rig again. Rob gets a QSL card from the club station and I get
a "guest operator" certificate...
I am QRV on venice Beach, CA with one wire in pair of palm trees and
another in the sand.
I am working on building interest in an XML-based ham log format. I
created a site XDIF.org
and a mailing list
to discuss XDIF. I wrote a sample XML Schema and sample log, but they
are just early ideas, and I am trying to get a good group of experts
together to define it -- and most importantly implement it.
Giant tower and beams at Knott's Berry Farm.
I set up mu KX1 in the hotel in santa Monica, cA and tried to work 40 or
20 with two wires dangling out the windows. I heard some strong
stations on 40m but they were having very long QSOs and I didn't get
there in time. On 14.009 I heard V73NS from the Marshall Islands but
couldn't get an answer.
I hooked up the PAC-12, KX1, and Alan's Balun in the 12 ohm position on
40m at the elementary school and heard a few CQ's and answered N6VOH
Barry from Los Angeles. Barry just bought an ICOM-703 for under $400 at
HRO in Anaheim and was running it to a Windom at 35ft. He was happy
with the new rig and said the sale was still on.
I had trouble with the 18ft LMR100 cable I made with the crimp-on
connectors from Eua-Am. I guess I have to buy either a crimp tool for
them or spend $5 for each one for a clamp on... So I used a 1ft RG-58/U
cable from Pasternak I got at a flea market instead and sat in the
Mt Hamilton, from IBM Almaden. This was Elecraft's field Day site...
I stopped at Starbuck's in Los Altos on the way to work after picking up
some pants at the tailor, and put a wire in a friendly tree. I got
W6ODW code practice on 7100, three-letter word groups, but nothing else.