And the line was completed while the Civil War was raging. Amazing!
Alan N1AL
On 11/21/23 13:43, Wayne Burdick wrote:
I highly recommend this fascinating first-person account. You might want to
skim over the parts about political infighting to get to descriptions of the
route, procurement
On 9/17/23 23:05, John Gay wrote:
...
Not much later I’d taught myself to solder and built a Knightkit Star Roamer.
Ah yes, the Star Roamer, my first "real" receiver. (The actual first
was a homebrew 1-tube regen.)
I feel like one of the Old Timers when I was young talking about their
Thanks Jim. Unfortunately I'm several thousand miles away from home so
I can't do that test right now. I'm pretty sure it's an electret, but
I'll check when I get home.
Alan N1AL
On 8/7/2023 11:00 PM, Jim Brown wrote:
On 8/7/2023 12:44 PM, Alan Bloom wrote:
I also use it for recording
I bought a CM-500 not too long ago. (I think it was late last year.) I
don't have any way to compare it to earlier production, but this one
does seem to have low microphone sensitivity. On the K4 I have to turn
on the preamp and set the mic gain to maximum to get 5 on the ALC meter
at
I had never used my CM-500 on a K3 so I can't do that comparison. But on
the K4 I had to turn on the internal mic preamp and set the mic gain all
the way to maximum. That seemed to give about the correct level - I
could talk at normal loudness to get 5 on the ALC.
I also use the CM-500 on my
Hi Al,
The "Bible" on this subject that has been used for many years by the
telecommunications industry is Motorola's "R56, Standards and Guidelines
for Communications Sites":
https://www.blm.gov/sites/blm.gov/files/Lands_ROW_Motorola_R56_2005_manual.pdf
It's kind of complicated, but it's
Since I found myself less than a 6-hour drive away from
Friedrichshafen, Germany this weekend, I decided to cross something off
my bucket list and attend the world-famous amateur radio convention.
Several people told me that the event was smaller than in previous
years, but it still was
It's the MENU:CenterEn function. When OFF, the center key does not
adjust the center frequency when in tracking mode.
Alan N1AL
On 4/25/23 08:06, ROBERT GARCEAU wrote:
When i press the Center button on my P3, I get a "center key disabled" message.
I have been trying to find the problem. No
There's no reason the P3 can't display it if you have a way to generate
the trapezoidal pattern from the transmitter. I think feeding a
triangle wave from a function generator into the mic input would do it.
Alan N1AL
On 4/19/23 16:38, Fred Jensen wrote:
and I'd buy one if it would do a
I changed the Subject line since this is a new topic.
If the wattmeter (in this case the P3 sensor) is placed after the tuner
then it will read the SWR of the antenna. To determine the net forward
power, just subtract the reflected power from the forward power.
To calculate reflected power,
Hi Dave,
There is a "SensorCal" entry in the Transmit Monitor Menu, but I don't
think it has enough range to correct such a large error.
There is also a "MtrScale" entry to set the full-scale power on the
meter display. Does the reading change when you change the scale?
In addition to the
Hiram Maxim, inventor of the Maxim machine gun, was the father of Hiram
Percy Maxim, a founder of ARRL:
https://news.yahoo.com/ukraines-troops-fight-off-massive-214437031.html
Alan N1AL
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Home:
On 3/6/23 15:08, Jim Brown wrote:
Most (but not all) verticals need radials to transmit a decent signal.
A vertical that needs radials is a lousy TX antenna without them.
Right.
I use a 6BTV, which is a 6-band trap vertical about 24 ft tall. With a
barefoot K4 at 100W I get out quite well.
the P3?
Thanks,
-- Dave, N8SBE
On 2023-02-24 13:23, Alan Bloom wrote:
Hi Dave,
Another possibility is that perhaps one of the display connectors has
come loose or is making a bad connection.
I normally wouldn't recommend this since these tiny connectors are
kind of tricky, but since the P3 isn't
Hi Dave,
Another possibility is that perhaps one of the display connectors has
come loose or is making a bad connection.
I normally wouldn't recommend this since these tiny connectors are kind
of tricky, but since the P3 isn't working anyway, there's nothing to lose.
There are two
On 2/17/23 14:14, kevin via Elecraft wrote:
If you want to copy and paste from the web it helps to add another
step to the process.
Paste the selected text into a text processor such as WordPad on a
Microsoft system or gedit on a Linux system. Then copy the text
again. This will
On 2/17/23 12:48, Dave New, N8SBE wrote:
Alan,
For starters where are all the spaces? :-) Makes it hard to read,
that's for sure.
That's weird. The spaces were there in the sent message - they somehow
disappeared in the reflected copy.; Let's try again:
The latest fad in AI (Artificial Intelligence) is ChatGPT, now supported
on Google and other platforms. I think of it as a "super Google" where
you can ask questions and get detailed answers. Just for grins I
entered the following request with the following answer. The response
"sounds"
Some would argue there's no activity in ham radio, or perhaps life itself,
more rewarding than making RTTY contest QSOs using a 1 pound radio with a
whip and an attached keyer paddle
You mean I no longer need my 75-pound Model 15 Teletype machine to
send/receive RTTY?
:=)
Alan N1AL
On
Its long-term utility was limited by the one-year non-renewable Novice license
of that era.
It actually was a pretty good CW rig. I used it long after I upgraded
from Novice. W1AW used one for their Novice station for awhile.
It had true full break-in that worked perfectly. The receiver
But I think that SDRs that digitize at the VFO frequency itself (I believe
this is generally called "direct sampling" on RX and "direct digital
synthesis" on TX?) can get away with a single channel, since there's no
mixer to cause the "you mix A and B and get both A + B and A - B even
though you
Dein Englisch ist viel besser als mein Deutsch!
On 6/10/22 15:44, df...@darc.de wrote:
Or this. While vacuuming it’s recommended to block the fan so it cannot rotate.
In some cases, when the blades are driven bei the airflow too fast, the fan
works as a generator and sends some voltage into
e about S6 on the ground-mounted trap
vertical at my house and they are almost buried in the noise when the
band opens up at night. So I'm not going to bug the neighbor about it.
But I bet they would have trouble trying to listen to AM radio at their
house.
Alan N1AL
On 6/7/22 17:21, Alan Bloom wrot
.
When I tune in one of the peaks, it sounds like a rhythmic grinding.
- Jerry KF6VB
On 2022-06-07 16:59, Alan Bloom wrote:
The weird thing about these spurs is how clean and stable they are.
Switching power supply noise is generally not frequency-stable and it
is not a clean CW
Alan,
I've had issues with the service from street to modem. As I understand,
there's a VDSL band which overlaps 7MHz band.
In my case, it was reversed, any transmission on 7MHz would disable TV
and Internet service.
John KN5L
On 6/7/22 7:54 PM, Alan Bloom wrote:
The ISP is TDS. They offer up
, the
spurs are still there. There is no wired connection from the K4 or the
desktop computer to the LAN (Wi-Fi only).
Alan N1AL
On 6/7/22 18:29, John Oppenheimer wrote:
Hi Alan,
What is your TV/Internet provider?
John KN5L
On 6/7/22 6:59 PM, Alan Bloom wrote:
The weird thing about these spurs
mes it's just idling, and then a burst of
information.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Alan Bloom wrote on 6/7/2022 4:21 PM:
As part of christening my new QTH/antenna/rig here at N1AL, today I
did the test where I recorded all off-the-air spurious signals on all
bands a
Yes, the modem router and a second router in the granny unit both run on
AC power, so they were off. There is no wired LAN to either the
computer or the K4 -- both connect to the Internet via Wi-Fi.
Alan N1AL
On 6/7/22 17:41, Ron wrote:
Sounds like wired LAN noise. Did you shut down your
As part of christening my new QTH/antenna/rig here at N1AL, today I did
the test where I recorded all off-the-air spurious signals on all bands
and then threw the main circuit breaker for the house and did the
measurement again, powering the K4 from a battery. This is to identify
any spurs
About 8 pm here in southern Utah I was listening to W1AW code practice
on 10 meters. Good strong signal - received on a ground-mounted trap
vertical antenna. And I could hear a bunch of 10 meter beacon stations.
Alan N1AL
On 5/26/22 17:46, Wayne Burdick wrote:
Amazing is the only word
Yes, a WiFi extender works for me as well. The one I'm using is $39 on
Amazon:
https://www.amazon.com/gp/product/B0118SPFCK/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8=1
Alan N1AL
On 4/26/22 07:01, Dave wrote:
As someone who doesn’t have a wired Ethernet connection in the shack, I can
There is a 52 year old Drake B-line in my shack
In those days, radios were easily field-repairable. If one quit
working, you replaced a tube or perhaps a burned-up resistor or
dried-out electrolytic capacitor. Almost all the parts were standard
devices that you could order from a parts
There are some components that can be damaged by water and/or cleaning
detergent. For example, you may need to re-lubricate the bearings of
variable capacitors and other components with moving parts.
If water gets inside a power transformer it can be hard to dry it out.
A method some use is
I believe that water-soluble flux does indeed need to be washed off to
prevent corrosion. That's what HP used (probably still uses) on
production PC boards.
However, RA (rosin activated) or RMA (rosin mildly-activated) fluxes
that are used in repair and rework (or homebrew projects) may be
ble DI washed to meet that
criteria.
Eric KI7LTT
On Sat, Jan 1, 2022, 11:16 AM Alan Bloom wrote:
Another problem with cleaning flux is ionic contamination. The
activator in the flux, which is necessary to get the solder to
stick, is
acidic. As long as the flux is left alo
Another problem with cleaning flux is ionic contamination. The
activator in the flux, which is necessary to get the solder to stick, is
acidic. As long as the flux is left alone, the ionic contamination is
trapped in the rosin where it can do no harm. But when you dissolve it
with alcohol
but having a low antenna goes a long
way toward limiting the contacts you make to NVIS propagation.
I suspect you could accomplish the same result simply by reducing
transmitter power.
A dipole 1/4 wavelength high has a nearly identical radiation pattern to
one close to the ground. It
On 10/21/2021 9:43 AM, Drew AF2Z wrote:
Dump Comcast at the soonest opportunity.
There may be more options than you realize that avoid having to deal
with the cable company and have no potential for interference to/from
the amateur station.
I recently bought a house here (near St. George
Recently I tried to order some electronic parts for a project I am
working on. In the old days (like, a year ago) I would just get on the
Digi-Key web site, order what I want, and it would arrive in the mail in
a few days.
These days, there are a LOT of parts on the Digi-Key web site that
NOTE: The operating manual has a black background
I can make the manual (K4 Built-In Operating Manual, rev C9.pdf) look
the way I want on the screen (black text on a white background with
images rendered in correct colors) in Adobe Reader by selecting:
Edit > Preferences > Accessibility
Don is exactly right about this. When I was at HP/Agilent, the company
directive was generally not to try to clean the rosin with alcohol.
(Rosin-core solder was used only in rework.) The rosin contains an acid
to help with the soldering, but the acid is locked up inside the rosin
where it
The Drake tuners used a Pi-L circuit topology in which the circulating
current in the inductor is independent of the load impedance. Assuming
almost all the loss is in the inductor, that means that the loss is
independent of the load impedance.
(Another advantage of that topology is you get
I can't speak directly about Elecraft tuners, but I did design an
antenna tuner when I was at Drake many years ago.
We specified the Drake MN-2700 at 5:1 SWR. I made sure it would match
that SWR at all phase angles on all specified bands.
Typically the low-impedance end tends to be the
I believe the SWR meter in the transceiver is at the input of the
internal tuner, not the output. Since it always reads close to 1:1 when
the tuner is engaged you may not notice if the antenna has a high SWR.
Alan N1AL
On 5/16/2021 5:10 PM, Wayne Burdick wrote:
The K4 shows all four TX bar
If the frequency display at the top center of the P3 screen is reading
zero, then that implies there is something wrong with the RS-232
connection between the K3 and the P3. Recheck the connections on page 5
of the P3 manual:
Best Buy has been totally out of laser printers for months.
Alan N1AL
On 3/31/2021 12:16 PM, Walter Underwood wrote:
Just not true. The Ford F-150 production is limited by parts availability. In
November, our order for a new fridge was canceled and the model is still not
available. If huge
The PX3 should draw no more than about 200 mA from the 12V supply.
When power is first applied, there will be some inrush current due to
the filter capacitors but I'm surprised that's enough to blow a 1A fuse.
Is it a fast-blow type fuse? Perhaps a slow-blow type would solve the
problem.
On 3/23/2021 11:51 AM, Jim Rhodes wrote:
I am often amazed at how well my tuners match some really outlandish antennas.
My KX2 loads up the aluminum rain gutter outside my window just fine on
80 through 10 meters. (I do have 1/4-wave counterpoise wires for 40, 20
and 10 meters.)
Alan N1AL
I just tried out DigiPan with my KX2 for the first time earlier today.
At first I thought it wasn't working because I couldn't decode any
signals on PSK31. Then I happened to stumble on a W1AW bulletin on
RTTY. Then they switched over to PSK31 and it decoded perfectly.
I guess the answer
This is nothing new. Over 40 years ago I sold a Drake 4-line to a guy
who saw my ad in QST. The rig was in good operating condition, but he
decided to send it in to Drake for a complete overhaul/tuneup, new
tubes, etc. and subtracted the cost from what he sent me. Basically he
got a new
Unassembled Heathkits have sold for amazing amounts of money. (I use
the past tense because I doubt there any of those treasures left these
days.)
I have even heard of people "making" an unassembled kit by buying a
built one, taking it apart, unsoldering all the components, and
replacing
If you return to a band but at a different K3 VFO frequency, the new
frequency may be outside the P3's span. If that happens, the P3 will
re-tune using an algorithm determined by the MENU > FixMode setting.
If you want to be sure the P3 frequency doesn't change you can set
FixMode to
I love to see people doing serious homebrew. Bravo!
I wonder if the SWR runaway at 150W could be due to the PVC pipe used as
the insulator for the variable capacitor? PVC is quite lossy at RF.
Perhaps when it gets hot it detunes the capacitor. It would be easy to
check by simply feeling
performance
on the various bands.
Alan N1AL
On 1/18/2021 5:38 PM, Alan Bloom wrote:
Well let's see...
Radiation resistance of a small loop is 31,171 * (Area / wavelength^2)^2
For a loop with a 91cm diameter at 14 MHz, I believe that comes out to
0.064 ohms.
Assuming the loss is due
determined to believe differently, and it's not my place
to convince you otherwise. You asked for inputs and I have made
mine. Hopefully you are right and I am wrong.
73,
Dave AB7E
On 1/18/2021 9:54 PM, Alan Bloom wrote:
> There is a reason why top quality variable capacitors often use
erials, such as a copper wire to an aluminum tube.
Yours is a limited theoretical analysis ... not a practical one.
Dave AB7E
On 1/18/2021 5:38 PM, Alan Bloom wrote:
Well let's see...
Radiation resistance of a small loop is 31,171 * (Area / wavelength^2)^2
For a loop with a 91cm diameter at 14
Or are they taking conductor geometry and other losses into account?
Wayne
N6KR
On Jan 18, 2021, at 2:05 PM, Alan Bloom wrote:
MFJ makes a pair of small, remotely-tuned loop antennas, the MFJ-1786 that
covers 10-30 MHz and the MFJ-1788 that covers 7 to 21+ MHz. As far as I can
tell, the two
MFJ makes a pair of small, remotely-tuned loop antennas, the MFJ-1786
that covers 10-30 MHz and the MFJ-1788 that covers 7 to 21+ MHz. As far
as I can tell, the two antennas are identical except for the size of the
tuning capacitor. Each consists of a 3 foot (91 cm) diameter loop made
of
On 1/5/2021 2:17 PM, Jim Brown wrote:
You've got to be in the middle of NOWHERE with a 50dB over S9 neighbor
to need more than a 16-bit sound card.
And that assumes the 50 dB over S9 signal is within the receiver
passband. Otherwise the receiver AGC will increase the volume of the
weak
I'm also using Thunderbird, but when I chose "Reply List" it puts my own
email address in the "To" field instead of the list address.
I have to select "Reply All", in which case it does the right thing -
reply to the sender as well as the list.
I'm using Firefox 78.6.0 (32-bit) on a Windows
480 x 272
On 12/18/2020 6:56 PM, Douglas Zwiebel wrote:
Anyone know what the screen resolution is?
Thanks
de Doug KR2Q
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Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
On 12/2/2020 9:06 AM, j...@kk9a.com wrote:
I concur, it is sad that Arecibo will not be rebuilt. The director of
operations is WP3R. I worked him in the Sweepstakes contest a couple
of weeks ago.
Yes, I met Sr. Vazquez WP3R when I visited Arecibo during a bicycle tour
5 years ago. A really
My first thought is there might be an intermittent RS-232 connection
between the K3 and the P3. That would prevent the P3 receiving the TX
and RX commands from the K3 so that the P3 gets hung up in TX or RX
mode. If you can lay your hands on a spare RS-232 cable, I would try it
to see if
Another solution is to use hermetically-sealed contacts. I built a
light-weight, single-lever key paddle using microswitches for the
contacts. It worked very well and never had problems with scratchy
contacts.
http://n1al.net/ham/paddle.htm
Alan N1AL
On 10/15/2020 11:42 AM, Bill Frantz
I believe that means that there is no RS-232 connection between the K3S
and P3. Check the K3S manual for the correct hookup.
Alan N1AL
On 10/8/2020 11:37 AM, Thaire Bryant wrote:
I have just noticed that after replacing my K3 with a K3S my P3 no longer
shows the center frequency of VFO A
I'm the guilty party who started the original off-topic thread. Sorry
about that!
If you're using the Thunderbird email client, the following is the
easiest way to automatically remove unwanted messages:
1. Click on the message.
2. Click on the menu icon (three horizontal lines) in the
Plus the K4 has a large, full-color, touchscreen display, Ethernet LAN,
several USB ports, flexible antenna switching, etc. And it's all
integrated in one box.
Alan N1AL
On 10/4/2020 9:31 AM, Gary J Ferdinand wrote:
Well, let’s think about this one a bit. I for one was not disappointed
And it's not just in California. Here where I'm staying in southern
Utah there have been a number of wildfires recently. In the middle of
the desert! Almost no trees here but with the heat we've been having
there are lots of brush fires.
Alan N1AL
On 9/29/2020 2:35 PM, Fred Jensen
I am currently "sheltering in place" far from home and would like to set
up a station here. I'm an 11-hour drive from home so I need to buy all
new accessories.
I already have a good Vibroplex key paddle at home so I don't need
another high-quality one. The good ones seem to start at around
In the "good old days" key shaping was done simply by adding a capacitor
to the key line or equivalent. That results in an exponential rise
and/or fall time, which is not optimum, so the time constant had to be
set pretty slow to avoid key clicks. Typically 5-10 ms. 10 ms results
in "mushy"
Of course, that's for the K3. The P3 doesn't have beep tones.
Alan N1AL
On 2020-04-26 20:02, M. George wrote:
> Go to the CONFIG SW TONE setting and change it to ON (the default).
>
> Max NG7M
>
> On Sun, Apr 26, 2020 at 7:32 PM Mike March wrote:
>
>> On my P3, the beep function has been
The P3 has a menu entry to calibrate its frequency MENU:Ref Cal
The calibration prodedure is on page 37 of the manual. I like to use an
AM broadcast station (preferably near the top of the band) for
calibration because these frequencies are highly accurate and AM mode
puts the carrier right at
> Since noise power scales with the square root of the bandwidth
That may be the source of the error. Noise power scales directly with
the bandwidth. (Noise *voltage* scales as the square root of the
bandwidth.)
Since the P3's effective bandwidth is 11 Hz and the K3 sensitivity is
specified
In the TX Monitor Menu, check that "Mod En" is enabled.
Alan N1AL
On 2020-04-10 21:48, Tom and Karen Norris wrote:
> I've been almost 2 years getting to this point of assembling the P3 Kit.
> The K3s I got to right away. Now that I have the P3 together and working
> the only problem I have
It sounds like one guy's rant to me. He refers to a letter supposedly
sent by CAL FIRE, but gives no reference to back up the claim.
In Sonoma County, California we have a 146.13/73 repeater system at the
County site on Sonoma Mountain that has been there for years. I'm a
member of the local
Yes I have been using Ubuntu for years. I used to have probllems with it
Every once in awhile something would break after an update. But since
I upgraded to version 16.04 LTS (Long Term Support version introduced in
2016) it has been stable.
At first I just used it for email and surfing the
Re: choice of test signal for calibrating the P3
> I am not certain why Alan prefers using a BCB signal, but WWV is an AM signal
> with defined frequency and tone frequencies.
Two reasons. The main one is that the local AM station's signal doesn't
depend on propagation. It is always there,
You could be right. I'm out of town right now so I can't check it. But
I think I remember that in some of the digital modes the definition of
VFO A frequency is different.
Alan N1AL
On 2019-07-23 11:36, Joe Subich, W4TV wrote:
> On 2019-07-23 12:47 PM, Alan Bloom wrote:
>
>> A
Good advice.
Also be aware that the center frequency differs depending on mode. For
example, it is the supressed carrier frequency on SSB but is offset by
typically 600 Hz on CW.
I like to use AM mode for frequeny calibration. After doing a frequency
calibration on the K3, tune to a signal
I'm out of town right now so I can't test this out. But when it came up
before, as I recall the problem turned out to be as Tom says, some
software programs send frequency and band commands in an order that
causes the P3 to temporarily be tuned outside the span window.
Normally, the P3 tries to
> Getting a 16 bit converter that fast, approaches the limit of available
> technology.
Right. At least at reasonable cost.
> These converters are pipeline architecture and have better than 90 db dynamic
> range.
Theoretically the dynamic range (ADC overload to noise floor) of an ADC
is a
I've long had mixed feelings about MFJ. They have some very
interesting, innovative, and cost-competitive products. However
sometimes the quality isn't there. For example I have an MFJ antenna
analyzer that was intermittent until I fixed a poor ground connection.
I forget the details, but as I
And don't forget that the isolation spec assumes a perfectd 50-ohm
termination on all ports. For example if one of the ports is seeing a
load with a 10 dB return loss, then the isolation will be no better than
10 dB.
Alan N1AL
On 2017-11-06 13:06, Jim Brown wrote:
> No -- the Mini-Circuits
The Dayton Hamvention is no longer in Dayton. I guess the Hara Arena
just got too scuzzy. The event is now in Xenia, a few miles east of Dayton.
http://hamvention.org/wp-content/uploads/2017/03/Map-to-Xenia.pdf
Alan N1AL
On 05/02/2017 04:33 PM, Fred Jensen wrote:
...
Wish I could come.
I've had exactly the opposite experience than Ken - excellent, flawless
performance from FedEx and horrible experience with the post office.
The local post office claims to have found a rule that says that if your
house is more than 1/2 mile from the public highway, they don't have to
deliver
The IEC 555 standard (later superseded by IEC 61000-3-2) specifies
allowed harmonic distortion in the power supply current of electronic
equipment:
https://en.wikipedia.org/wiki/IEC_61000-3-2
I believe it is mandatory in Europe and some other countries but not the
United States:
With 1500W of power, if the SWR is greater than 3:1 you may be exceeding
the ratings of the feedline. For example, Belden 9914 is rated at a
maximum of 300 VRMS, which is 1800W with a 50-ohm feedline or only 600W
with a 3:1 SWR. At 30 MHz, RG-8/213 style coax is typically rated at
1500W with
On 04/14/2017 03:20 AM, aj4tf wrote:
You will not regret an Elecraft purchase even if it is your first radio.
This thread is getting pretty long but I can't help but chime in.
If money is an issue (i.e. you're not part of the 1%), then I think
buying a used rig is a great way to go. If you
I don't believe this is a limitation of the K2. The panadapter
bandwidth is limited by the bandwidth of the sound card.
By the way, if the sound card's sample rate is 192 kHz, the panadapter
bandwidth is actually somewhat less than that, limited by the
anti-aliasing filter in the sound card,
One thing to keep in mind is that the XG3 has a square wave output so
there are lots of harmonics. One consequence is you can't use it with a
directional coupler to measure SWR unless you filter out the harmonics
somehow. Also you may need to worry about interference to other
services, although
I try not to post about off-topic items, but I can't resist.
There's probably nothing you can do to absolutely protect any computer
that is connected to the Internet. Someday you *WILL* click on some
attachment or there will be an operating system bug that doesn't get
caught and corrected in
If the AGC is working right, it is equivalent to manually riding the RF
gain control. It shouldn't affect the decoding.
If the AGC time constant is too fast then, yes, it can cause distortion
and degrade the decoding. But that should never happen in a
properly-designed AGC system.
AGC
Hi Paul,
It's just a matter of adjusting the SensorCal menu setting until the
power reads the same as the device used for the calibration. Of course,
that assumes the calibration device is more accurate than the P3. :=)
The nominal calibration value is 500. The intent was to make it
Yes, it can be calibrated in a manner similar to the W2. The menu entry
is TXMonMenu/SensorCal. There is a separate calibration stored for each
sensor type (200W/2000W, HF/VHF).
Alan N1AL
On 03/06/2017 08:26 AM, paul ecker via Elecraft wrote:
A related question on this subject concerning
The P3 shows total forward power. The power delivered to the feedline
is forward minus reflected.
With a 13:1 SWR, 73.5% of the power is reflected and 26.5% is
transmitted. If the transmitted power is 92 watts then the total
forward power should be 347 watts.
Alan N1AL
On 03/05/2017
. However, this scheme requires that the antennas be
on a shared feedline. With your approach the 40m antenna would no longer be
on the same feedline as the higher bands.
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Alan
Bloom
Sent: Tuesday
I use two of the top guy wires as an inverted vee. There are insulators
near the top of the guys and about 50 feet or so down. The vee is
brought to resonance on 80 meters with a center-tapped loading coil,
which also acts as a balun. The best match was with the coax tapped
right about at
The P3 will work with the K2, although you need to modify the K2 to get
an IF output signal. In the P3 menu, go to "Xcvr Sel" and select "4915
kHz" or "4915 kHz (inverted)" depending on which band you're on.
The P3 display does not indicate the K2 frequency, receive bandwidth,
etc. so it's
Yes, you could use an 8-pole double-throw relay to switch between the
two sensors.
The P3 and W2 use the same information from the sensors and the same
control lines.
Alan N1AL
On 01/13/2017 04:59 AM, Jean-François Ménard wrote:
Hi, thanks for the information. I just sent an email to
On 01/12/2017 04:44 PM, Harry Yingst via Elecraft wrote:
I was curious if anyone has been using the P3 TX Monitor with 2 sensors
If so how are you switching between the two sensors
I use this 4-port manual LAN switch, which can support up to 4 sensors:
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