Right, Don!
If someone does not want to sell something to Alaska - its simple - I
will not buy it (because they will not sell it to me - even when I
pay the shipping). I still get ignorant questions like do we use US
currency and do they need a passport to visit (AK became the 49th
state of t
I agree with Bob, but as 45-years experience has taught me.
Properly crimped bright new copper wire is fine. Take a look several
years later (also compare contact resistance; probably best measured
as voltage drop under load). If you live in the desert where
humidity never rises above 25% yo
When I need to know accurate power readings my best instrument is
either scope and good 50-ohm termination, or using my HP432A mw power
meter. Its about 1/2 dB accurate. But +10mw is the highest scale so
you need several high power coaxial attenuators to measure
power. 40dB will permit measu
Great retort, Don. You beat me to saying the same thing.
So plug it in with assumptions and you get the "stupeed" award. If
lucky it just sits there and does nothing. Unlucky and you just
tested your warrantee (Not Covered). But hooking up ham gear without
opening manual is standard operat
How many crimp tools? (accumulated partly for working jobs I had to
supply my own tools)
Two coax crimpers for RG58/RG59/RG174 - the one I use is ratcheted
with replaceable dies
One NAPA crimper for butt spices, spades, and ring connectors
One RJ11/RJ45
Two Molex type 1.4 to 2.8mm
One for 50-
Obviously you've never been in the military? (or forgot?)
The military is a big "testing pool" for "idiots" (please note the
quotes for idiot-its use is tongue-in-cheek). I used to work for
Hughes Aircraft writing "tech manuals" for the military. You could
not assume the operator knew anyth
Congrats to Gary - KB8RQ and Lance - W7GJ operating V6M on Falalop
Island in Yap!
I made my inaugural receipt of 6m-eme signals last night and able to
copy/decode three stations (which included Gary):
073100 4 -22 1.385 38 3* V6M KG7H DN18 1 0 0.0
074500 10 -20 2.11
Two things:
1. Good idea to have proof of purchase that has date. Not for
traveling abroad but so you can show upon re-entry to the US at
Customs, previous ownership and prove its not something you bought in
Italy. Ele-craft sounds pretty Italian to me.
2. Do not put in checked luggage. Re
This thread is probably just about over-
I ship using USPS Priority Mail almost exclusively.
Small box = $5.25*
Medium box = $11.30*
Large box = $15.80*
*If you pay online - a bit more if you pay at the PO
Priority Mail is 2-day delivery which translates to 3-day in Alaska
(it gets to the Ancho
Jim beat me to saying it:
Depends on what band, what application you are talking about.
JT65 was created for weak-signal eme (originally) ...and where I use
it 1000w is QRO and 600w is not.
QRP must be used in context of what is being attempted...I ran 150w
on 2m-eme and that is considered QRP
Jim,
I agree that the thread is pretty well thrashed, but -
I do like to hear comparisons of Elecraft equipment with other brands
as it keeps abreast of what's happening out there. Technology is
"stampeding ahead" and all ham gear makers are susceptible to the
changing landscape.
I hated w
Excuse me while I boast a bit:
I built two DEMI transverter kits this past month and have two more
to do. The board is smd with about 100 or more components. I built
a 222-28 and 2304-144 transverter and waiting for a 902-144 and a
second 2304-144 kit to arrive. it takes me about 7-10 days
-shrink and had some tags on the job. But I found using colored
electrical tape the longest lived.
I have black (of course) and
Brown/Red/Orange/Yellow/Green/Blue/Violet/Gray and White. That
covers 0 thru 9. But I have devised a color code using more than one
color tape:
Violet cables are
I built my station shelf (hutch, whatever) out of 1-inch by 12-inch
pine shelving. Dimensioned lumber is actually 3/inch thick Its
48-inch wide with one riser in the center and two shelves high
28-inches overall height.
drawing is second on this page:
http://www.kl7uw.com/station%20layout.htm
When we moved to our current home in 2006, my ham stations and
outside antenna took a primary consideration in even deciding on
which property to choose. My nine sled dogs were the other primary
consideration. We moved from a 5ac lot to 1-3/4ac of which about 1ac
is not woods. But moving out
While its true there is a drop off in numbers of serious weak-signal
hams, I consider myself one.
I have antennas and equipment for 50/144/222/432/900/1296/2400/3400/10,368 MHz
I do eme on 144 and 1296 and building for 50 and 3400 eme.
Being in Alaska really is in the VHF wilderness as there are
I used standard peg board: http://www.kl7uw.com/Backside_Station.jpg
One can loop tywraps thru the holes to tie down wiring. Helps to
have really long arms, though!
73, Ed - KL7UW
From: Mel Farrer via Elecraft
To: "Chuck Milam, N9KY" , bruce
Subject: Re: [Elecraft] Ham Shack Arra
Don't have much to say:
Had a Cantenna from Heath in the 60's - knocked over; spilt mineral
oil on the floor, threw can away!
I have acquired "dry" loads over the years rated into UHF and
sometimes to mw at flea markets and swaps. My highest power load is
500w Sierra with power meter and sw
Most VHF operators learn that there are good deals in used amps. I
only have one 180w 2m amp that I bought new (in 1976). All the
others were bought from other hams.
But one can build an amp vs buying overpriced Mirage junk. Look at
the 80w 2m kit that W6PQL offers. I have actually done a
nce between 500w
and 800w than between 800w and 2.5kw signal wise if I understand
correctly...
Jerry Moore
AE4PB, K3S - S.N. 010324
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Edward
R Cole
Sent: Friday, September 18, 2015 2:00 PM
To: Elec
Elecraft Digest works pretty well for me. I'm on about 18 other
lists so if all e-mails arrived individually the sorting thru would
be horrendous. With the digest I can reply to any comments on the
list. Only problem is sometimes an topic get moderated before I
receive the digest so I cannot
Anyone needing a W6PQL 80w 2m linear amplifier for their KX3-2M or
Elecraft transverter and want it professionally built I have the
answer for you. I had already considered offering the W6PQL 80w amp
fully assembled with RF output bar meter. The kit comes with
attenuator that will accept up t
I have analyzed my costs to build single units of the W6PQL 80w 2m
amplifier and the total material costs come to $254. Based on that I
have posted information at:
http://www.kl7uw.com/kits.htm
The amplifier will use a 1.375x5.375x8 inch heat sink with a 120mm
fan. Fan will be thermistor con
I think Ray is not the only one to suggest obtaining used VHF amps.
I owned one of the "brown" B1016, which is the older version, and it
didn't output 80w anymore but did a good job at about 65w. The
preamps in these VHF amps were never low-noise preamps but extra gain
did help some of the ol
Having done a few home metal bending jobs, I leave it to the
professional metal smiths if I need a nice enclosure. I use to have
access to a brake at work (retired five years). I also used to buy
some really nice enclosures from a K3 ham in the east who is now sk
(used in my 2m-8877 and CCI H
Yep!
I lived in CA for ten years; LA and the Mojave (been there done
that). Some feel that way about Alaska. Summer temps never over
80F, and never water the lawn (nature does that well
enough). Everything is green all summer long (leaves now are turning
gold as we are into fall and gettin
Do not intend to upgrade either KIO3 or KXV3; I have the PR6-10 and
the USB/RS232 works fine with line-in/out.
I did (this week) order two new SYN3A for both main and sub-Rx for
the lower phase noise; and the KBPF3 mod kit for use down on 630m.
http://www.kl7uw.com/about.htm
what home looks li
Bob,
Good comments. I think those of us who have been in ham radio for
many years still think of physical filters as doing the job of
specifying the radio bandwidth and forget that today's radio often is
digital or partially digital where DSP does the job and filters are
only used supplement
Doug,
Not sure what the first paragraph has to do with filter selection on the K3?
Using the 1st IF output one bypasses all filters and the DSP 2nd IF
completely. I know because I do that for both main and sub-receiver
on my K3. I use two LP-Pan (one for each IF).
You do not define "Full"
I just bought this GPS for providing accurate time to my computer:
ProGin GPS RECEIVER BU-353 (USB) SiRF STAR III
ebay: 181887610445
Cost me $24 and change including shipping (from Israel).
This is my replacement for Dimension-4 when I pull the internet plug
on my XP computer and switch to my l
I do not unplug anything when not in use. Never had a failure from
doing that. I do live in a virtually lightning free environment but
static buildup in dry winter winds can happen. This is why having a
shorted RFC across antenna lead -in or back/back diodes on RX input
are used. System is
I chose to upgrade my K3/10 SN4043.
That involves buying two KSYN3A (I have the subRx) and also got one
KBPF3MDKT upgrade kit for my main Rx. Cost with shipping was $468.95.
I suppose I could remove all the options I have installed and try
selling my plain K3/10 and purchasing a new K3s/10.
Starting a new topic but it was inspired from the 'K3/0 forum' topic.
I'm still thriving from my Alaskan Ham Home, but know someday
(hopefully distant) we will be moving to assisted living and I'm just
musing a bit how I can continue operating. Most of those
institutions to not permit ham ant
Thanks everyone for great comments!
Dennis,
Certainly that could be an issue. Recently read of some hams using
wifi gear for point-point ham connection so if a suitable antenna
could be used (like a patch on a window facing your remote site) for
trailerized remote that is only a few miles aw
Obviously most of you never built something and had to add up the cost!
Getting 50-100w multi-mode, multi-band into a KX3 sized package for
under $500 - dreamers!
It cost nearly that just for the linear amp. I suppose you want the
KX3 with 50w amp for the same cost.
Not going to happen. Well
I'd be careful what I asked for. Sma connectors are way more
difficult to connect than TMP. In close quarters almost impossible
to turn the nut on a sma and the fine thread has to be exactly
aligned. I have two custom-made tools for doing that and that is not
always good enough.
Better wou
I encountered an issue with remote keying my K3 via the straight key
jack today. After keying up for a test carrier and releasing the KEY
line the radio repeatedly keyed up at about 2x per second for
anywhere from three to ten times before stopping:
kerchunk-kerchunk-kerchunk-kerchunk ...
I
Just another accolade for the Astron PS. I bought a 35VM in 1980 to
run my then new TS-180S and it has worked over the years without fail
until last year when a couple pass transistors finally died...that is
34-years without failure!
On my last job (retired in 2009) we had lots of Astron 20A'
Jim,
Could resist but to reply (keep your sense of humor hat on!):
--
From: Jim Brown
To: elecraft@mailman.qth.net
Subject: [Elecraft] The Technical Side of Ham Radio
Message-ID: <563310bc.8080...@audiosystemsgroup.com>
Content-Type: text/plain; charset=windows-1252;
Back in the 1950's all radios drifted a lot at cold start...that is
why many let their receivers run continuously.
OCXO = Oven Controlled Xtal Oscillator. I utilizes an insulated
enclosure heated above the ambient temperature to provide a very
stable operating temperature for the xtal oscilla
Doug,
Many do not understand what how K3EXREF improves accuracy and
stability. Its commonly thought that its a phase locking system
(which it is not doing).
Basic frequency accuracy and stability is established by the TCXO in
the K3 which provides frequency reference to the VFO's. Per Elec
Thanks, Ron, that is a better description of the EXREF function.
I left out the page number where the TCXO specs are given (in my 2010
K3 manual) - page 8
It lists TCXO3-1 as 1ppm but I think it was commonly found to do 0.5ppm.
That matches my measurements at 28-MHz of 14-Hz error. MY actual
Topic has digressed to NR:
Simple question. Is all this feedback on how good or how bad NR
works about reception of CW (or does it apply to SSB?). Only time I
really need NR is when local noise overwhelms normally strong SSB
(e.g. signal is running S8-S9 and noise rises up to S8-S9. I find
Silly Syllabic Babble
At 10:00 AM 11/10/2015, you wrote:
What is SSB an acronym for???
Jim
W6AIM
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
__
Elecraft mailing list
Home:
I have finally gotten a breather from building transverters so
announcing a special order opportunity for those who wrote me
directly indicating an interest in purchasing the "W6PQL" 80w 2m Linear Amp.
This is a pre-sales special offer (starting today) for priority
purchase of the amp which is
Well the cat is out of the bag. I did not intend to publicize this
until next week. General orders will not be taken until then, so if
you are not one of the seven I intended to receive this - you can relax.
I will open up orders on Nov. 23 taken in order of e-mail sent after
utc and of
Good response with six paid pre-orders which will take me until after
Christmas to finish construction (I build one at a time). I am now
ordering the parts which in some cases gets quantity discounts and/or
reduced shipping per unit.
The next opening for taking orders will be at utc on No
My old 1976 Bird is that way... like an unruly child ... needs a slap
now an then to keep it on track! Actually, I don't condone physical
punishment of children. A word or a look can do much more...my Dad
was a master at that and I guess I picked up some from him. But
back to electronics:
hope this hasn't already been moderated - get the digest hours after
the "fact".
I tried a couple old computer speakers which were horrible sounding
and also subject to RFI (have a little on 80 & 40m). So I bought the
COMspkr from West Mountain Radio and am happy. I run my KX3 thru
this spe
I run FLdigi to my K3 via two stereo audio cables (spkr out to K3
line-in; line-in to k3 line-out) and a RS232/USB conversion cable for
controlling PTT on the K3. I use an external souncard with manual
level adjustments (knobs) which I find handy over getting dialog
windows in the computer to
I use DEMI transverters and they are capable operating over 4-MHz on
2m. The issue is with the K3 Tx power which falls off quickly above
30-MHz. I am unable to have enough drive at 30.52 MHz to get more
than 5w out of my 50w transverter on 146.52-MHz.
One could install a second oscillator wi
Charlie,
Hopefully, you do not have any signal leakage at 27-MHz to create Rx problems.
I'm using a L222-28 DEMI transverter and tunes 222-225 for Rx with no
issue. All activity is centered on 223.50 calling frequency with
exception of one repeater: input is 223.34 and output is 224.94 so
2
As of z (4pm Sunday for me) I am accepting orders for the second
production of amps to begin in January. I have received one order at
this point. I will accept orders until after Christmas when I will
close taking orders for January construction and be ordering parts.
If no more interest
before the daily
truck leaves the day's mail.
73, Ed - KL7UW
At 08:43 AM 11/23/2015, Edward R Cole wrote:
As of z (4pm Sunday for me) I am accepting orders for the second
production of amps to begin in January. I have received one order
at this point. I will accept orders until
six boxes of parts from vendors so most
of the parts are here. There are some back ordered items. I will
start assembly beginning next week as this week is taken with
finishing two DEMI transverter kits that preceded the amplifier orders.
73, Ed - KL7UW
At 12:46 PM 11/23/2015, Edward R Cole
January orders closed with five assembled and one kit
ordered. Ordering is open for later production (February+)
http://www.kl7uw.com/kits.htm
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
__
Just checked my K3/10 and it displays 13.7 with 13.73v measured where
the power cable is attached to my power distribution. Negligible
voltage drop in Elecraft supplied power cord when in Rx which displays 1.01a.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
I've decided to sell my Comm Concepts Inc. model AN762 HF
amplifier. Its rated at 140w and I get between 130 to 150w depending
on band (160-10m). Amp was built from CCI kit:
http://www.communication-concepts.com/140-watt/
And built on 1.5x5.5x6 inch heat sink with 5.5x11x3 inch custom
chassis
Quick report on AntlionAudio ModMic:
I bought model 5 which has both omni and cardiod pattern mic
elements. After a little K3 Manual study: page 55 for MIC SEL options
I chose to try using the 3.5mm rear mic jack; ModMic comes with
stereo 3.5mm so questioned if it would work in mono jack.
tip
Barry,
Not disagreeing. I bought my K3, SN4043, in 2010. It has an
internal preamp (push PRE) which gives about 10-dB gain (I
think). A few years went by and Elecraft announced the PR6 external
"add-on" preamp to improve 10m and 6m receiver performance. They
kind of admitted the bare K3
hmmm, well I'm hearing a lot of opinion expressed.
First off, how many of you have acctually built ckts
for10-GHz+? (show of hands) And of you who did, how many worked the
first time as designed without "tinkering"? Snow-flaking is a well
known method of "tweaking" the circuit to get it to
I run all my 12v equipment (almost anyway) on a 50A Astron PS. Since
the PS is rack-mounted in a half-height cabinet the dc cable is about
12-foot long, so I used #4 welding cable that terminates on a 30A
Fuse holder. That feeds two HD barrier strip terminal blocks (for
pos and neg rails). T
In today's USPS, both UPS and FedEx also carry the "mail" so one
cannot be sure who the "actual carrier" is.
I have no home delivery of US Mail so my USPS packages are held
secure inside the PO. Both UPS and FedEx delivery are drop n scoot
(lucky if you are home and hear the knock). And ther
hopefully topic will pass political correction police.
Recent order of a Yamaha CM500 from Amazon.com got "Lost in space".
Well actually their compooter substituted another city for mine and
sent it there, where all tracking failed. Fortunately I noticed it
was "delivery attempted" after a we
Since the K3 operates so differently (than traditional radios) for
proper modulation I thought I'd ask this:
In olden days amplifiers were rated in PEP typically as 2x average
(or CW) power, so for AM one had to set carrier at 1/4 full carrier
output to stay linear. (1/2 carrier for SSB).
But
e mode automatically.
The same should be true of the transverter output.
73,
Don W3FPR
On 4/23/2018 4:56 AM, Edward R Cole wrote:
Since the K3 operates so differently (than
traditional radios) for proper modulation I thought I'd ask this:
In olden days amplifiers were rated in PEP
typically as
Ted,
I wonder if the load center panel is mounted on an exterior wall? If
so running a penetration from the panel to outside might be
better. Then you could route it in conduit or exterior cable routed
along exterior to a good spot to bring it back inside at the lower
level. That still mig
Mike,
You mention this occurs when interior temp reaches 50c (122F). Just
a guess that a device in the SWR ckt or indicator driver is changing
bias with temp and giving a false indication. This is really a
question for Elecraft Tech Dept. I I am correct in my supposition
they, already know
I would agree. If I invested >$5K in a shiny new piece of ham gear I
would not risk it to damage from moisture. Besides, I would want to
admire it every time I sat down in the shack.
With that being said, I have a lot of equipment remotely located at
tower top or bottom. Most of my operatin
Frank,
I opted to do a few updates:
New synth boards for both main and sub receiver
Mod to general coverage bw filter
I already have plenty USB/RS-232 conversion cables and prefer that
line audio go to the computer via external soundcards. USB I/F would
require use of internal soundcard.
A
Steve - VE3SMA,
I see the same thing on 2m using my K3 with a DEMI transverter. The
K3 will tune 28-32 MHz in transverter mode but there is not enough
drive above 30 MHz. My 25w transverter drops to 7w at 146.52 (30.52
MHz IF). So its not usable at the FM end of 2m band.
Whether this a li
Just to add a little info, I measured and compared my KX3-SN475 to my
K3-SN4043:
http://www.kl7uw.com/HF.htm Half-way down the page.
KX3 on 6m with preamp on was -127 dBm with 2.8-KHz SSB*
K3 on 6m with ARR Gasfet preamp was -137 dBm*
on 10m the K3+PRE outperformed the KX3, as well
Subsequent
DEMI recommends 50-ohm terms on unused outputs of its 4-way 10-MHz
distribution amp. It uses MAR6 mmic's that output 10mw.
73, Ed
From: Wes Stewart
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Terminators on empty outputs/connectors
Message-ID: <5c34b345-5bd6-6e85-442b-ccc9b004b...@tr
For 35 years I raised and ran sled dogs here in AK. 1982-1988 I
volunteered as radio operator from remote checkpoints on the Iditarod
Sled Dog Race held each March from Anchorage to Nome (nearly 1200
miles thru the AK roadless wilderness). In the early years of the
race, ham radio provided c
For me music ability aided sending good CW, not the reverse. I
played a band instrument from 5th grade thru end of HS, but acquired
my Novice in my 8th grade (Nov. 1958, almost 60-years ago). I passed
the tech. 1959 (which used the General Class written exam) a year
before taking algebra.
I
Good point about "weak signal". Really refers to receiving and not
transmitting.
Example: eme operators are so dense in population in EU they have
mutually agreed to transmit during the same sequence in order to
minimize interference.
New: digital modes use on HF *should* augment operating
I really ought not step into this discussion. Obviously the Elecraft
Reflector is a mainstay of CW ops.
I've been using digital modes one eme since 2003. Back then the
introductory program was JT44 which was supplanted by JT65 within a
couple years. Then many variants were done to address c
Ah, yes ... the desert. Land of rattlesnakes, hairy spiders, and
horny toads. We got none of them in Alaska, absolutely no snakes of
any flavor, only garden spiders, and only the goldminers are h***.
Enough rain to never water the lawn. We got snow, too!!
I lived on the edge of the Mojave i
Fred,
I had both. Bought sixer in 1965 and installed it with vibrator PS
in my 65 Mustang with a halo bumper-mounted. A couple years later
bought the 6N2 and ran it at 150w plate-modulated AM (using PS and
modulator of a DX100). Fun years operating from Mich.
Re: 50.125, sure its the cal
Howard,
Good points on cooling.
Those of olden tymes, recall the fanless 6146, 813, etc.
The 3CX and 4CX ceramic tubes need high pressure for fast air
movement to keep them alive. Note; cooling on these tubes is applied
with filament voltage and run several minutes after removing voltage
fo
I feed my K3 speaker output direct to an old ten-inch National Radio
speaker, which simply mounted in a metal speaker box and open on the
back. Like the sound better than new modern speakers (amplified or not).
But I confess to running Western Mountain COMspkr's with my KX3 or my
900-MHz surp
Frankly I agree with Bob-K4TAX:
If you ever have chance to visit the sound booth at either a
broadcast station or recording studio, note the use of acoustic tile.
The Super-Contest station of KL7RA (sk) is lined with acoustic tile
and you note immediately how quiet the room sounds (even with
I do not use a GPSDO for 10-MHz reference source. Instead I bought a
Russian surplus OCXO from e-bay for $40:
http://www.kl7uw.com/K3EXREF.htm was my beta-tester report
http://www.kl7uw.com/Rubidium.htm more info on OCXO install. I
stopped using a "wall-wart" for 12v supply after discovering
Wes,
You got it pretty close. I was kind of stumped by Clay's
question. Disciplining I take to mean controlling from an external
source - huh? why?
If you want GPS frequency accuracy then buy a GPSDO for a couple
hundred dollars, but as far as affecting K3 frequency accuracy it
will not b
For ideas on how to use TX INHIBIT:
http://www.kl7uw.com/TX-INHIBIT.htm
I do exactly as Don suggests; connect KEYOUT to sequencer input and
last stage of sequencer is "K4" shown in the Inhibit diagram on my webpage.
For ideas on building your computer/radio I/F:
http://www.kl7uw.com/Digital_I-
We have used the parking lot of Sky View HS, Soldotna, AK for several
years. HS was shutdown about five years ago and located in hills
south of the *small* city of 7500. Club has TS450's and run two
stations 80-10m, 100w under KL7AN.
I usually join them to help setup at 9am with 10am start t
Just as "Life is too short for QRP", Life is too short for devoting
my retirement years to learning Linux.
It seems these days more hams are professional computer geeks but
total amateurs with understanding RF. Evidence: the growing
population of wireless noise floor. Some day they will be
A few months ago I corresponded with a ham from Montana that was
going to loan me his Heath SB200 or SB220 6m-converted amp this
summer. I forgot to note his name/callsign and now can't find
our correspondence from a few months ago. We were meeting at
Whitehall, MT for the exchange. Perchan
Firstly, I am quite comfortable/experienced running JT65 with my K3,
so hopefully some of that will transfer to setting up the KX3.
I have ordered a West Mountain "RIGblaster Plug & Play" with
RJ45-to-4 ring mic jack optional cable for interfacing my laptop to
the KX3. I still have to downloa
I always am *somewhat amused* by the "6m Open" e-mail.
My question would be how any KL7's did you work? 99% of openings do
not happen "Up here". I'll admit not listening, kinda busy preparing
for 9,000 mile road trip. Maybe hear us with our 80w KX3+KXPA100
(1/4 wave vertical mobile whip or
Andy,
The problem is there are few stations in Alaska, whether they work 6m
or any other band. About 2002 it was stated there were 3802 licenced
hams residing in AK. Now you know half of them never get on at
all. Out of the other half 50% do only HF: the other 49% do only
VHF-FM. That lea
Since this is for 6m which kind of considered VHF, then use of a
sequencer should be considered. With either K3 or K3S the last stage
of the sequencer can control TX INHIBIT control line of the K3/K3S
which will delay RF output into the PA until after LNA and TR relay
switching has occurred.
Along this line of discussion, I wonder if those who have the KRX3
could use it as a noise cancelling receiver (similar to the
anc-4)? If the aux receiver output in diversity mode could be
reverse phased to cancel noise using a "noise sniffer" antenna. I
realise that would eliminate use of the
OK, I realize the Timewave and MFJ noise cancellers operate at RF and
not AF...But I was thinking of the amazing noise reduction that SDR's
accomplish in the digital relm. I understand it may not be that
simple. But sometimes asking the question gets new thinking going.
For example the second
There is also the issue that the various AGC's may be varying the
>amplitude, so the process would have to address both instant
>amplitude and phase to affect cancellation. Should be able to
>program that, though. How hard to code, who knows???
>
>73, Guy.
>
>On Sun,
At 10:06 PM 11/29/2010, you wrote:
>Noted your comment on noise reduction by phase nulling. Have you
>looked on info on pages by pa0sim, see www.pa0sim.nl, he has done
>more or less what I think you are considering. Ie connecting the
>output from 2 phase locked receivers fed with separate antenn
nt' of
>exchanging the DSP board with more powerfulÂ
>version may be feasible. Â cheers, Johnny VR2XMC
>- éµä»¶å件 å¯ä»¶äººï¹ Edward R.
>Cole æ¶ä»¶äººï¹
>olaf.de...@mollefaret.no å¯æ¬(CC)
>Elecraft@mailman.qth.net å³éæ¥æï¹
>2010/11/30 (äº)
Response to Bill W4ZV: Of course not everyone would chose to use
their sub-Rx for noise cancelling. I mentioned that in my initial
suggestion. I was only thinking of the diversity discussion that
David, AB7E, refers to and thinking there was another approach to
obtaining noise reduction or n
Last spring I went hat in hand to my wife with the 3-year old K3
brochure. I did make an offer that she could not refuse (pay off the
loan on her Toyota Sienna). We plundered my 401K account for $12K; I
got $4K and she got $8K. Of course the interest on her car loan was
way more than what th
I have the TCXO3-1 (49.380.000) but never bothered to calibrate
it. So out of curiosity, I measured my freq. on the K3 in the tune
mode on 20m and 6m:
Measured on a EIP-538 microwave counter, agrees <1-Hz accuracy with
my rubidium on 10-MHz:
14.205.000 read 14.204.994 (-6Hz)
50.110.000 read 50.
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