Around 1920Z on 2005 Jan 30 I talked to W0RW
Paul in Colorado Springs, CO.
Paul was operating from his shack and I was using my K2 at the local school,
with an SD-20.
Around 6:00J I talked to W3FF
on 5371.5. Budd was
hard to hear but Bill was 589.
I heard W4DEC
Larry from Theodore, Alabama, near Mobile.
Larry was running 25-40W on a Kenwood TS 2000 from a 25ft high 40m inverted
vee and was 589 here. He couldn't copy me at what my meter said was 50W
but could at what my meter said was 100W. I was uncomfortable with the
100w from the HFpacker amp so we said 73.
Pleather case for the WB6ZQZ
HW-16 Electrolytic Capacitors
Here's an article on rebuilding electrolytic capacitors
. Maybe a good plan for my HW-16.
cutting the caps off in place. Sounds like a
I may be helping PAARA 2005
field day, or I might operate 1B1B. Last year I operated 1B1B and placed second in entire Pacific Division
in the 1B1B category.
I took my KX1 and Hamstick to the SF Baylands and heard a nice QSO
between KH6AP 599 and DW7YE 449A on 14.054. I switched from the short Hamstick to the long one, and they came up a bit. When they
signed off a few OM tried to call but they had such a long QSO I doubt
either wanted another right away, so I waitied a minute and called QRL
then CQ DE WA5ZNU/QRPM.
NH7D Ben in Hilo, HI answered me rigtht away on 14.054. Ben was 559 in the QRN-free zone and we had a nice QSO on his TenTec Argo at 15W into an inverted vee. Ben gave me a 559 (probably 459 as he missed some) but later said I was up to 569. Ben asked for a QSL so when I get
my new ones I will send one.
SSTV Gallery 14.230
I have started doing SSTV reception and have a short script that
thumbnails the ones I receive. See RX
for the list.
Olivia HF MFSK Speed and Performance
put together an analysis
of Olivia parameters and has sorted all the ones that are under the 300 baud US legal limit by speed.
Here it is reproduced:
|tones ||BW ||baud ||sec/block ||chars/sec ||mult ||?|
I hacked up a visual CQ preamble for PSK that fits in 31Hz.
There's a sample WAV.gz.
I think that to do it for real you could populate the 512 element FFT
with a windowed bitmap representation and then convolve it to put it
back in the time domain.
This example was generated with a hack program called Coagula which does
pretty much that.
I'm not sure about the bad sidebands though...
More Duet Progress
Whirlpool has kindly offered to send a new motor and control unit to
install and see if the problem is particular to my unit.
They also informally said that the control panel is unshielded plastic.
Whirlpool's service people were scheduled to come out yesterday between
1 and 5pm but called at 3:30 to say they weren't qualified.
I had a hint of that when the caller ID said "SEARS."
So I called today and waited on hold about 45 minutes. I explained the
problem again and they said "Our technical support people say that the
control panel and washer will just do that and even changing a new
control board and motor won't help." So I asked for the FCC ID number
for its Part 15B unintentional radiator and in response I got "Mike," a
supervisor. Mike and I talked for a while and he said he would go back
to the engineering group with the data I have and try to find out what's
up. I told him I thought that their control panel was unshielded and
perhaps they had overlooked Part 15(b) compliance. I sent him the images and told him
that I would like their help in finding out whether their design or my
unit is meeting the regulations or not. He said that they have only
three products with electronic controls and that this unit is designed
in "North America" but manufactured in Germany. "This particular SKU is
not sold in Germany" he said, when I asked if perhaps it was supposed to
be CE compliant as well as FCC compliant and they'd removed CE required
I am at home after lunch waiting for the washing machine service and I
calling CQ 599 on 18.075 and answered him with my K2
barefoot at 14 watts. Stuart is in Surry, BC running an Icom-817 to an
80ft antenna up 25ft and has had snow on the ground and is expecting
more tomorrow. Quick QSO and then Stuart went QRT.
I worked CO3VK
Jose in Bejucal, Habana Cuba, EL82tw.
Jose was using an old "Spilsbury
" rig with a home-made VFO and 35 watts.
7070. QSO end 08 Jan 05 05:18:22 UTC
QSL via IZ8EBI
My newly-repaired Radio Shack 0-15 counter, made of 4 flip flops. All
but one grain-of-wheat bulb was gone, and the glass-encased
photoresistor broke in transit, but Radio Shack had more! Not glass,
but plastic coated, and the bulbs were colored. I got tired of
stripping the leads on them though and put in LEDs after a while. It
works great! I built it when I was about 10...it had a couple of lifted
foils but worked once I replaced the components. I remember replacing
the photoresistor with a switch and learning what debouncing was...
Olivia HF MFSK Mode with Walsh FEC
There is a new digital mode based on MFSK with FEC using Walsh functions, and a selectable bandwidth from 125Hz to 2KHZ.
There is a mailing list, digitalradio with Yahoo Groups, for discussing it, but you need a password to read the archives.
Tbe designer of the mode, Pawel Jalocha SP9VRC, has published a
specification, and so US hams are now in compliance with FCC order DA 95-2106, which the ARRL says reads:
"This Order amends Section 97.309(a) of the Commission's Rules...to clarify that amateur stations may use any digital code that has its technical characteristics publicly documented. This action was initiated by a letter from the American Radio Relay League, Inc. (ARRL)."
Updates: See performance figures for the various configurations done by Mark N5RFX. See N1US's Olivia MFSK HowTo for Windows users. For Linux, the curses-based interface is available by contacting SP9VRC by email. Hopefully, GPL source will be available soon.
I have been having terrible trouble with my Whirlpool Duet
washer producing RFI (EMC problems). We've had it since July 2003, but I've been unable to quiet it. Finally I sought advice from the RFI mailing list at contesting.com and got the following responses:
- Do call the service center. I did and they are coming out on Monday.
- Try making the station ground wire instead of braid and eliminate a long bonding wire outside. Unfortunately, this doesn't help, and I get the noise in an AM radio in the house as well.
- Try a Radio Shack brute-force line filter. I did, no help.
- Whirlpool service says to make sure that the 3-prong outlet is grounded. II measure a 0.02 volt AC ripple between the ground pin and the cold water pipe, so I ran a wire from the ground to the cold water pipe for testing. No change.
- An EMC engineer suggests that I use a small antenna and see if the noise is from the power line or from the body of the unit, and to find out if the motor is frequency-controlled AC or stepper/PWM DC. No luck finding out, but bingo on the radio test: with my KX1 and 1ft wire antenna, I pick up the biggest noise from the control panel, and the least noise from the bottom of the washer and the washer cavity.
Finally, I produced spectrum plots of noise with gMFSK and my K2 and FT-817. With these I learned that the majority of the noise is concentrated in repeating frequencies, every 15-17Khz. Sadly, one of these falls on 14.070 Mhz. see the spectrum plots.
This is me at age 6 on my father N5LK
(at the time WA5UBQ
Kid's Radio Day
We worked Carl (10) and Joe (11) at K1LGQ
in Brookline, NH on 14.270. They persevered and heard us at 25W or so.
At 2249Z I heard K0RDW
calling CQ on 14.032.71 and answered him
with my K2 at full power and the J-38 from my first-grade science
project. I unhooked the International Crystal OX-1 oscillator from one
side of the key and answered Ron with 15W or so from the K2. Ron
is in St. Paul, MN where it was 22F and sleeting. He was running
25W from an Icom 756 Pro to a 3 el up 45 feet! His signal was great
here, about 579; Ron gave me a 559.