Amen!!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Sunday, November 10, 2013 10:33 PM
To: Rick; topband@contesting.com
Subject: Re: Topband: Steady Carrier on 80 CW
What a stupid frequency for a test beacon of any type!
-
Some switching power supplies are frequency-jittered to spread their
spectrum and enable their host devices to meet FCC or Industry Canada
line-conducted emissions limits. Also some of the newer lighting devices and
cicuits can produce RF!! Y ou might try walking your neighborhood with a
portable
Some of the line-conducted emissions can radiate from the power distribution
circuits - especially with overhead service
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of N1BUG
Sent: Saturday, November 09, 2013 6:29 PM
To: Rick ve3mm
Cc:
The switching frequency of switching power supplies can vary with the burden
on the supply as well as ambient temperature. If it's sensitive to outdoor
temperature could be the electric utility meters - most of those contain
switching power supplies these days, and the meter's internal temperature
Maybe they caught all the fish they could hold and headed to port to offload
their catch! :-)
K4OT V
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Rick
Stealey
Sent: Tuesday, November 05, 2013 8:32 PM
To: topband@contesting.com
Subject: Re:
Thanks for confirming, JC. Well, that suggests that the source is onshore
somewhere here in the states - perhaps northern Florida or south Georgia?
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of JC N4IS
Sent: Sunday, November 03,
Hi, Bill
Well, if it is a ham, he must have a pretty decent antenna - being heard
rather well all round NA and SA!
73,
Charlie, K4OTV
-Original Message-
From: Bill Cromwell [mailto:wrcromw...@gmail.com]
Sent: Sunday, November 03, 2013 8:46 AM
To: Charlie Cunningham
Cc: topband
A man after my own heart!! :-)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Herb
Schoenbohm
Sent: Sunday, November 03, 2013 2:31 PM
To: topband@contesting.com
Subject: Re: Topband: Nye Viking MB-V-A
I had a similar problem with the
Well, most all the guys in New England see it peaking pretty much due south
- which suggests that the origin is off-shore in the Atlantic, rather than
on shore in the Carolinas. (Maybe from the Bermuda Triangle? :-))
How long have you had that Hi-Z 3-element receive array, Paul?
Charlie, K4OTV
That's good information, Jerry!
What we need, rather than relying on antenna patterns for direction, is
direct phase measurement between a pair of vertical elements - with a third
element (or a pair) to resolve F/B ambiguity) if well calibrated , such an
array can be quite good for
Actually, Gary, if we triangulate using Victor's 150 deg bearing from
Carroll, Ohio and your 180 degree bearing from SE CT, we could plot an
intersection and figure out just about where the source is! I suspect that
the modulation that Tim said was too rapid for QSB is likely due to swells
and
BTW, Gary,
When Tim, K3LR, started this thread he also reported that the signals peaked
at around 150 deg, from Middlesex, PA, so that, combined with your due south
bearing, would also put the source out to sea! ( and not in NC or SC)
73,
Charlie, K4OTV
-Original Message-
From: Topband
/radio_buoys.htm
The good news is they're battery operated and will ultimately have to be
retrieved
for battery replacement.
73
Frank
W3LPL
- Original Message -
From: Charlie Cunningham charlie-cunning...@nc.rr.com
To: g...@ka1j.com, Topband@contesting.com
Sent: Friday, November 1
Thanks for the information, Gary! I'm impressed with and envious of your
directional resolution capability!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary
Smith
Sent: Friday, November 01, 2013 5:35 AM
To:
Thanks, Gary
Well, there are many vessels from Japan, Korea, US and Canada (and others)
that operate out there!
Yes, unfortunate that we have intruders in our bands!
73,
Charlie,K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary
Smith
Thanks, Gary and Mike
Well, with my small lot, about all I can do is be envious!! :-)
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary
Smith
Sent: Friday, November 01, 2013 10:05 AM
To: topband@contesting.com
Subject: Re:
Don't think Roger was testing. I think he was reporting a signal he was
hearing from the south of ME.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bill
Stewart
Sent: Friday, November 01, 2013 12:16 PM
To: Roger D Johnson
Cc: Top
Smithfield, NC?
-Original Message-
From: Bill Stewart [mailto:cw...@embarqmail.com]
Sent: Friday, November 01, 2013 12:46 PM
To: Charlie Cunningham
Cc: Top Band Reflector; Roger D Johnson
Subject: Re: Topband: TEST on 1830
Hi Charlie, I wasn't sure...subj. sorta sounded like
he might
Hi, Don
Well, we can improve on that by using a solar determination of true North.
The way that I do it for my antenna arrays is:
1.0 Use a weather site to determine local sunrise and sunset times for your
location on the day that you are going to make the determination.
2.0 Split the
Seems that I saw something a while back about some fishing beacons on the
low end of 80m ( or maybe 160m -but I think it was 80m)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Victor A.
Kean, Jr.
Sent: Thursday, October 31, 2013
FYI
http://www.w8ji.com/ndb%20beacon%20fish%20buoy%20net%20beacons.htm
(Looks like Tom knows a bit about those beacons - including fishing and
driftnet beacons.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Victor A.
Kean, Jr.
Well, that makes a lot more sense, Gary!! That would be down into the
Atlantic or Carribean or SA. I don't understand how Victor could think that
NC and SC are at 150 deg from him, if he's in New England??
Charlie, K4OTV Raleigh, NC
-Original Message-
From: Topband
BTW, Gary - how are you measuring direction on 80m?
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Gary
Smith
Sent: Friday, November 01, 2013 1:18 AM
To: Topband@contesting.com
Subject: Re: Topband: Steady Carrier on 80 CW
3.503.1 due south from SE
Now I understand!! Victor, K1LT is NOT on New England - he's in OH! So, I
guess 150 deg to NC or SC makes sense - although he could still be looking
past us out into the ocean, which is what I expect is the case. I guess I'm
just an old coot, and back in the old days, we could tell where someone
Hi, Gary
Should do fine! The W2DU balun is a good current-mode design by someone who
knew what he was doing!
As for 160, I do have a W2DU current mode balun, from Unadilla that is
longer that the 80-10m version (more beads) but I never really pushed it. I
did use it some n 80m. Actually on
and below the optical carrier frequency. The
photo-diode would see the optical carrier and the +/-
2 MHz sidebands as an amptltude modulate optical carrier and we would select
the lower sideband to recover the 2 MHz baseband signal.
73,
Charlie, K4OTV
73.
Charlie Cunningham
-Original Message
Well, might work. Another idea though, check with Fair-Rite - I believe that
they have some cores that wil fit over .405 RG-8, and I know they have lots
that sill fit over RG-58 or RG-8X. If you don't mind removing the
connector, you can just slip a bunch of them over the end of the cable and
use
That would work as well. I used something similar, but with less turns to
precede the 4:1 current balun feeding the drivers on my home brew 5-band
quad.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim
Bennett
Sent: Thursday,
What works flawlessly, Randy? The link? J
73,
Charlie, K4OTV
From: Randy Lake [mailto:randyn1...@gmail.com]
Sent: Thursday, October 24, 2013 7:51 PM
To: Charlie Cunningham
Cc: Jim Bennett; g...@ka1j.com; topband@contesting.com
Subject: Re: Topband: Balun question
Check this link out
Just teasin' you, Randy! J I think the snap-ons would be quick, simple and
very effective and should outlast the antenna, I expect!
From: Randy Lake [mailto:randyn1...@gmail.com]
Sent: Thursday, October 24, 2013 7:58 PM
To: Charlie Cunningham
Cc: Jim Bennett; g...@ka1j.com; topband
True!
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Thursday, October 24, 2013 8:41 PM
To: g...@ka1j.com; topband@contesting.com
Subject: Re: Topband: Balun question
Though this reflector is for 160M I have an 80M question that
A W2DU balun, however is another story! Walt knew what he was doing!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Thursday, October 24, 2013 8:41 PM
To: g...@ka1j.com; topband@contesting.com
Subject: Re: Topband:
Hi, Carsten
You might try it with just a series C into the 3/8 wave on 80m. The VSWR may
not be that bad! Then you could always add a 4:1 balun or transformer if
needed.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carsten
I liked the idea of the ceramic based knife switch! That ought to take most
anything us hams could throw at it at pretty much any VSWR! :-)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Sunday, October 20, 2013 6:39
Hi, Jim
In my experience, the answer is no to both questions - although a full
size inverted L , while being a very effective transmit antenna can be a
really noisy receive antenna. Can you go out in the woods and hang a flag,
pennant or KAZ terminated loop for a receive antenna? Helped me a LOT
: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim F.
Sent: Saturday, October 19, 2013 1:18 PM
To: Charlie Cunningham; 'top Band'; 'Jim Fitton'
Subject: Re: Topband: Raised radial question from NH
Thank you Charlie,
In that case I may be able to get another raised radial up before
-boun...@contesting.com] On Behalf Of Bruce
Sent: Saturday, October 19, 2013 5:26 PM
To: Charlie Cunningham; 'Jim F.'; 'top Band'; 'Jim Fitton'
Subject: Re: Topband: Raised radial question from NH
Charlie,
The so called KAZ is a receiving Delta loop. I ran into the KAZ name when
Broadcast Band
Thanks for sharing the patent info, Frank! Really interesting!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of
donov...@starpower.net
Sent: Thursday, October 17, 2013 12:15 PM
To: topband
Cc: Tim Shoppa
Subject: Re: Topband: W8ji
I expect that needs to be a good quality and seriously heavy duty switch
that's used to vary the configuration of the matching network - at least at
full power!
Thanks, Tom!
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
???
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard
Fry
Sent: Friday, September 27, 2013 7:27 PM
To: topband@contesting.com
Subject: Topband: 5/8 wavelength vertical is mo betta than shorter
versions??
Niko AC6DD wrote:
... the 5/8 Vertical
Quite a bit of the radiation from 5/8 wave verticals is at relatively high
elevation angles - above 40 degrees elevation.
(Perhaps useful for VHF mobiles that need to hit mountain top or hill-top
repeaters)
Charlie, K4OTV
-Original Message-
From: Topband
Hi Herb.
I'll bet that 1/2 wave sloper worked great! When this thread got started, I
modeled several verticals in EZNEC from 1/4 wave to 5/8 wave in height. I
sent the plots around to folks that were interested via e-mail. Couldn't
post them here on the reflector. At the request of Carl, KM1H,I
What's the objective of your beacon experiment, Don?
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of
dnem...@aol.com
Sent: Sunday, September 22, 2013 7:11 PM
To: topband@contesting.com
Subject: Topband: BEACON
My 1 watt beacon is on
Very nice to have all of those collected into one place!
Thanks for sharing, Tom! Have a god day!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom
Boucher
Sent: Friday, September 20, 2013 2:25 AM
To: 160 reflector
Subject:
Thanks for sharing, Dan! I've used EZNEC a LOT over the years, and I've done
a lot of useful work with it, but I was unaware of AutoEZ. I'll look into it
and maybe investigate the paid version as well.
Thanks, and have a good day!
73,
Charlie, K4OTV
-Original Message-
From: Topband
Hi, Eddie
Nicely done! Looks reasonably professional to me! At the very least,
you've made a good effort to quantify your results in a meaningful and
repeatable way, with decent tools. No need to tune your sense antennas, as
long as there is enough signal level and dynamic range for your FS
Hi, Mike
You've reminded me that I have pair of 2 amp FS RF ammeters (1950s/1960s
era) that I need to hunt up and squirrel away before clearing out the junk
around my home and preparing to move out. Someday, I may be able to put up
another 160 antenna!
73,
Charlie, K4OTV
-Original
Yes, EZNEC does work!! I've had great success with it over the years. It
was great for my home-brew (home-EZNEC-designed) single-feedline 5-band
quad. It was great when I was building and tuning it to watch all the
resonances and impedances fall in line just where EZNEC predicted! (Killer
Hello, Jim
You seem to be lost!
First of all, the thing that you originally called a hairpin match is
NOT a shunt match. The coil, or hairpin is in SERIES with the reactance
and radiation resistance and copper losses of the antenna!
For the thing to work the antenna must be shortened some from
Sorry, I just looked at my own post and I see that the reflector or e-mail
changed my superscripts to lower case.
The formula is Q(squared) +1 or Q*2 +1
Sorry,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Charlie
Cunningham
Sent
BTW, Jim
The Qs that you threw out for the inductor are OUTRAGEOUS! The only reason
for raising the Q of the inductor is to reduce its losses that are going to
be pretty small across 50 ohms, even at full power. because the the voltages
and currents at the end of your feedline are going to be
Great!
I like the spark gap and the 33K static drain much better between the
antenna and ground, that between the antenna and radials as in your first
post! I was thinking of sending you a note to that effect, but you saved me
the trouble, Mike!
I expect that your capacitor matching network
22:44:45 -0400 Charlie Cunningham
charlie-cunning...@nc.rr.com writes:
Valid points, Keith.
I think the boys that went to FO0AAA did good to hang up that KAZ
terminated Loop that John, ON4UN, put together for them!
snip
And FYIthere was no receiving amplifier used with that antenna
Thanks, Doug
I guess that explains why I had, in my mind, and memory, associated the
FO0AAA antenna, with John, ON4UN. I do know that Earl, K6SE was an
authority on those types of antennas!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On
Wow! That's a good one!! I worked Jacky, 3B8CF many years ago on 160, but
never 3B9! Lowest bands I've ever worked 3B9 were 40 and 30 m. I worked
Jacky just before sunset here in Raleigh NC! Worked him with the FT-757 GX
that I had back then, with a GG 4-400A afterburner doing the best it
of day e.g.
Drive time.
Tim N3QE
- Original Message -
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 11:17 AM
To: 'James Rodenkirch' rodenkirch_...@msn.com; 'Mike Armstrong'
armst...@aol.com; 'Tom W8JI' w...@w8ji.com
Cc: topband
Well it seems that somehow the document attachment got removed. I'll try
again!
Charlie
_
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 1:13 PM
To: 'Shoppa, Tim'; 'rodenkirch_...@msn.com'; 'armst
Figure 1: 1/4 wave 40m GP with 4 elevated resonant radials at 10 above
real, high accuracy GND.
Figure 2: Elevation plot for 1/4 wave GP - Peak elevation angle 22.0 degrees
Figure 3: 1/2 wave vertical radiator above 4 elevated resonant radials at
10' above real GND
Figure 4: Elevation
??
_
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 1:13 PM
To: 'Shoppa, Tim'; 'rodenkirch_...@msn.com'; 'armst...@aol.com';
'w...@w8ji.com'
Cc: 'topband@contesting.com'
Subject: RE: Topband: 5/8
Sorry folks - no luck getingthe document through - even whe I copied it into
the bosy of an e-mail and tried to send it to the reflector. If anyone's
interested, send me your e-mail address and I'll send it via e-mail/Outlook
to you directly.
Thanks.
Charlie, K4OTV
_
Topband
for
the reflector to accept.
Later,
Charlie, K4OTV
-Original Message-
From: Carl [mailto:k...@jeremy.mv.com]
Sent: Sunday, September 08, 2013 12:24 PM
To: Charlie Cunningham; 'James Rodenkirch'; 'Mike Armstrong'; 'Tom W8JI';
Shoppa, Tim; w7...@juno.com
Cc: topband@contesting.com
Subject
Thanks, Jim!
Have a good Sunday afternoon/evening!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Sunday, September 08, 2013 3:53 PM
To: Charlie Cunningham; 'Carl'; 'Mike Armstrong'; 'Tom W8JI'; 'Shoppa
: Topband: 5/8 wavelength vertical is mo betta than
shorterversions??
On 9/8/2013 1:08 PM, Charlie Cunningham wrote:
... I didn't have time to get back to it
today because I got all bolluxed up trying to include an attachment to my
reflector post. Also, even trying to embed the document in the body
on 160 is
limited!
Regards,
Charlie, K4oTV
-Original Message-
From: Carl [mailto:k...@jeremy.mv.com]
Sent: Sunday, September 08, 2013 4:54 PM
To: Charlie Cunningham; 'Shoppa, Tim'; rodenkirch_...@msn.com;
armst...@aol.com; w...@w8ji.com
Cc: topband@contesting.com
Subject: Re: Topband: 5/8
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Sunday, September 08, 2013 7:04 PM
To: Jo YC0LOW; 'Jo YC0LOW'
Cc: topband@contesting.com
Subject: FW: Verticals - 1/4. 1/2 and 5/8 wave - Hope this works
Hello, Jo!!
Good to hear from Indonesia
Hi, Jim!
Good to hear from you!
I don't think there's any simple or definitive answer to your question. The
reason is that the 5/8 wave vertical splits the radiation into 2 lobes and has
a second higher angle lobe, compared to a 1/4 wave monopole. Sometimes,
depending on distance (and skip
BTW, Jim
Nothing wrong with a 1/4 wave ground-plane! I've done really well on 40, 80 and
160 with quarter-wave verticals ( if you're willing to accept the 160 inverted
L as a quarter wave vertical.) I am - the models say it has comparable gain
and radiation patterns. ( also ran elevated
: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Saturday, September 07, 2013 9:41 PM
To: Charlie Cunningham; topband@contesting.com
Subject: Re: Topband: 5/8 wavelength vertical is mo betta than shorter
versions??
My loop, Charlie, is doing well - it's
that
there are also feed-lines running up the tower?
I did model my 5-band home-brew quad on my little 40' tower.
Regards,
Charlie
-Original Message-
From: Carl [mailto:k...@jeremy.mv.com]
Sent: Saturday, September 07, 2013 3:04 PM
To: Charlie Cunningham; 'Mike Armstrong'; 'Mike Waters';
map
Hi, Mike
When you say that you use stacked vertical beams - aren't they stacked
horizontally?
It seems to me that the vertical collinear elements,along the lines of what
Carl is describing, are generally vertical collinear 1/2 waves in phase -
usually with a 1/4 wave phasing line between
Well, if I understand Carl's proposed antenna - he is proposing enough
vertical height for two 1/4 wave ground plane antennas, one above the other.
In that case I would elect to use a vertical dipole. That would place the
current maximum at least a 1/4 wave above ground - reducing the ground
Gee, I wonder if Carl had any idea what a catfight he was going to start,
when he began this thread?
For my money, if I had enough support height to support two 1/4 wave ground
planes, one above the other, I'd install a vertical 1/2 wave dipole and get
the current maximum higher above ground to
To: Charlie Cunningham
Cc: ZR; Shoppa, Tim; topband@contesting.com
Subject: Re: Topband: Are stacked verticals feasible?
Carl and Charlie,
I am not sure it would even be close to practical or even doable, but I
remember seeing an old book on verticals written by a prior Navy Captain, I
believe. He had
To: Mike Armstrong
Cc: Charlie Cunningham; ZR; topband@contesting.com; Shoppa, Tim
Subject: Re: Topband: Are stacked verticals feasible?
Mike,
This is the book.
http://store.cq-amateur-radio.com/Detail.bok?no=26
73, Tony K4QE
On Fri, Sep 6, 2013 at 10:41 PM, Mike Armstrong armst
Actually, the normal way to stack vertidals is HORIZONTALLy - into
broadside or end-fire arrays. It seems that Carl is describing collinear
monopoles - in the case he describes - collinear ground-planes - possible
- but why??
-Original Message-
From: Topband
,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Andy Ikin
Sent: Monday, August 26, 2013 6:29 AM
To: Charlie Cunningham
Cc: Topband Reflector
Subject: Re: Topband: Anyone have a boat load of J-310s?
Charlie wrote on Aug. 26.
Your preamp
What's taking out the J-310s, Jim? I have some around here somewhere, but
it's been years since I've seen them. Did you try Digi-Key?
Do you need to modify your preamp a bit to better protect the J-310s?
73,
Charlie, K4OTV
-Original Message-
From: Topband
That's great, Jim!! Sounds like it's working well!! Have fun! I'm sure you
will like it!
73,
Charlie, K4OTV
From: James Rodenkirch [mailto:rodenkirch_...@msn.com]
Sent: Sunday, August 25, 2013 9:53 AM
To: Charlie Cunningham
Subject: RE: Topband: Two 2:1 transformers to choose from
Jim,
If you really have trouble getting some J-310s, let me know. I'd really
have to hunt -probably out in my garage. The J-310s that I have, if I could
find them, are, I expect, at least 20 years old and pre-date the shenanigans
that Paul is warning you about. The ones that I had, are, as I
That's always worked for me, Mike! The bit of resistance that I suggested
that Jim add ahead of the FET gate and the diodes serves the same purpose as
your incandescent lamp - but I expect that the lamp is more rugged and
forgiving.
73,
Charlie, K4OTV
-Original Message-
From: Topband
[mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Sunday, August 25, 2013 4:43 PM
To: Charlie Cunningham; 'Paul Christensen'; topband@contesting.com
Subject: Re: Topband: Anyone have a boat load of J-310s?
I've found what I'll need, Charlie, courtesy of Andy Ikin! Thanks
-Original Message-
From: Andy Ikin [mailto:andrew.i...@btopenworld.com]
Sent: Sunday, August 25, 2013 5:16 PM
To: Charlie Cunningham
Cc: Topband Reflector
Subject: Re: Topband: Anyone have a boat load of J-310s?
Thirty years ago I used 6DJ8 (E88CC) to solve a third order IMD problem
-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Andy Ikin
Sent: Sunday, August 25, 2013 6:32 PM
To: Charlie Cunningham
Cc: Topband Reflector
Subject: Re: Topband: Anyone have a boat load of J-310s?
Charlie,
When I was poor man 40 years ago, I always wanted Tektronix 545B
As I recall, when I wound the tranformer for my 40' X 10' KAZ terminated
loop, I wound it 3:13 T because I was trying to match from 50 ohms up to
around 950 ohms. The core I used was binocular that I cobbled together by
taping together two Fair-Rite tubular cores, side-by-side. I used wire-wrap
Pretty sure it's 73 material, Mike. That's about all I had in my Fair-Rite
engineering and designer kits.
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Mike
Waters
Sent: Saturday, August 24, 2013 8:12 PM
To: Charlie Cunningham
Well, Jim
Since you wound both transformers, why not try them both, and see if you
can measure any difference? I' guessing you won't see much!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Thursday,
Well, that FO0AAA KAZ terminated loop has pretty good gain as terminated RX
loops go, so I wouldn't expect the system to be noise starved, but the gain
opf that loop is of the order of -30 dBi at 160, so a preamp is in order.
Charlie, K4OTV
-Original Message-
From: Topband
I'd be surprised if a little mismatch between an approx. 100 ohm twisted
pair and 50 ohm coax would make any really noticeable difference, but some
sort of balun might be in order. For the 40' X 10' KAZ loop that I had, I
just tied the primary of the transformer to some RG-58 that ran through an
,
Charlie, K4OTV
From: Mike Waters [mailto:mikew...@gmail.com]
Sent: Thursday, August 22, 2013 10:41 PM
To: Charlie Cunningham; topband
Subject: Re: Topband: Two 2:1 transformers to choose from!!
This is the preamp I use. The circuit is from Solid State Design For the
Radio Amateur, C 1977
I've also had very good results using wire-wrap wire for winding small RF
transformers. Pretty easy to work with - and it's rugged.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of
mstang...@comcast.net
Sent: Wednesday, August 21, 2013
Well, my submerged radials worked well, years ago. Of course, it probably
helped that the lake had been treated with copper sulfate for vegetation
control!
:-)
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tod
Sent: Wednesday,
Sounds like a robust relay, just above the feed-point would de-tune the L
rather nicely. At least that was my thought. Probably simpler and more
straightforward than trying to detune it in the shack.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com]
recommend hot-switching, though.
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Shoppa,
Tim
Sent: Thursday, August 15, 2013 10:58 AM
To: Charlie Cunningham; 'Tom W8JI'; 'Tomas Magyla'; topband@contesting.com
Subject: Re: Topband: How
Well, Tomas
If you are comfortable using Smith Charts, you could work out some reactance
for any length of feedline to detune the antenna. Other than your 1/2 wave
approach, another approach would be to use an electrical 1/4 wave or 3/4
wave feedline and short it in the shack with a relay when
Sad, but true.
Folks don't seem to listen much anymore. Seem to prefer being spoon-fed
DX from Internet packet clusters.
Charlie. K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of
mstang...@comcast.net
Sent: Tuesday, August 13, 2013 1:42 PM
To:
-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Tuesday, August 13, 2013 2:57 PM
To: Charlie Cunningham; mstang...@comcast.net; 'Mike Waters'
Cc: 'topband'
Subject: Re: Topband: Lightning QRN season?
Heck, got on 160 yesterday morning and called CQ
Worked the VK3 with 100w from the FT-757GX I had at that time. Antenna -
Inverted L.
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Tuesday, August 13, 2013 3:10 PM
To: 'James Rodenkirch'; 'mstang...@comcast.net'; 'Mike Waters'
Cc: 'topband
Well, it's winter down under - good quiet time for them to hear us! :-)
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John
Harden, D.M.D.
Sent: Tuesday, August 13, 2013 4:26 PM
To: James Rodenkirch
Cc: Charlie Cunningham; topband@contesting.com
Well, because it's winter in VK, Jim, I expect that they have a better shot
at hearing YOU!!
Charlie
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Tuesday, August 13, 2013 6:08 PM
To: Charlie Cunningham; 'John Harden, D.M.D
Jim,
I completely agree with Jim Brown! I noted those 2:1 transformers the other
day and meant to send you a note to say that I wouldn't bother! That
little bit of mismatch loss won't make any difference!
73,
Charlie, K4OTV
-Original Message-
From: Topband
201 - 300 of 355 matches
Mail list logo
