Note that the Japanese manufacturers sell many radios with different
feature sets at different price points. If you decide you need a feature
that's not in your radio, you usually have to buy a new one. Elecraft, for
20+ years, has sold only a few radios, each with a variety of optional
features.
Brown noise is supposed to be sleep inducing. The security folks used
pink noise in the plenum above the SCIF's to mask conversations. I
can't remember exactly what the spectrum of A-weighting was, I think it
had a dip in the mid-range.
The TV station I was employed by in college would
kn5l's question suggests another: How do you measure reliably audio rms
power? (Say for EME Sun noise.)
It turns out, the Windows program Daqarta work perfectly with either sound
card audio or USB audio. Go to "Options," then "measure..." , then "dB." I
believe the 30-day free trial, when
> On Jun 20, 2019, at 12:26 PM, rich hurd WC3T wrote:
>
> There's a way to get around that in a Win 10 machine; tell it you're on a
> metered Internet connection. It won't update until you tell it to. It's
> in a setting somewhere.
Here is how to set it.
>From my earlier message below, S/N 752 has been purchased but I have S/N 234
remaining.
Thanks,
Bob K5WA
From: K5WA
Sent: Sunday, June 9, 2019 3:23 PM
To: 'Elecraft@mailman.qth.net'
Subject: A couple of K3 rigs for sale
Well, the K4 got my attention and I need to clear the decks
There's a way to get around that in a Win 10 machine; tell it you're on a
metered Internet connection. It won't update until you tell it to. It's
in a setting somewhere.
That said, I have a Dell Inspiron Mini that won't run much beyond Win XP
without severely bogging down. It is a small form
Windows 10 allows you to delay updates for up to 35 days.
Ken K6MR
From: elecraft-boun...@mailman.qth.net on
behalf of Jim Brown
Sent: Thursday, June 20, 2019 12:16:53 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] new computers, the search for
On 6/20/2019 11:17 AM, EricJ wrote:
Computers with serial ports running Windows XP/7 are approaching boat
anchor status
Not quite -- I paid extra for a couple of off-lease Win 7 machines so
that I wouldn't be subject to Win 10's forced automatic updates. I like
updates, but on MY schedule.
Eric,
Beats the heck out of the cell phone industry, where any phone that is
more than about 3 yrs old goes out of support, and I'm forced to upgrade
if I want any more security updates.
I anticipate that soon the feds will decide to regulate support of
connected IoT devices, requiring
I respectfully disagree on Drake receivers and EF Johnson transmitters
as boat anchors. My finding is there no suitable place on either one
to which one can attach a length of rope, hence becoming an anchor
line. Therefore, neither are considered to be a boat anchor.
73
Bob, K4TAX
On
We use USB/serial adapters from startech
https://www.newegg.com/startech-icusb234858i-usb-to-rs-232-422-485-serial/p/N82E16812399182
at work for our serial port needs. mostly because the ports enumerate in
the same order every time, which is a huge bonus. they have smaller,
cheaper versions as
Computers with serial ports running Windows XP/7 are approaching boat
anchor status along with Drake receivers and EF Johnson transmitters.
Eric KE6US
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Bob is correct to the extent that Pink Noise approximates the SPECTRUM
of speech, but John's is on target that speech is not continuous, but
highly variable in amplitude. For uncompressed speech, the average value
is typically as much as 20 dB below the peak value; compression can
reduce that
Hi Bob,
Viewing pink noise with an oscilloscope, it is continuous, where as
speech has breaks.
The web page is evaluating both expected power to a load and compression
gain. Using a little over six second recorded speech. Recording contains
fast spoken words, mostly numbers and a few "this is a
To evaluate speech use a pink noise source. That is the standard source signal
for acoustic measurements.
Bob, K4TAX
Sent from my iPhone
> On Jun 20, 2019, at 10:34 AM, John Oppenheimer wrote:
>
> Hi Don,
>
>> On 6/20/19 9:21 AM, Don Wilhelm wrote:
>> John,
>>
>> That connection is OK
I've found "off lease" and refurbished older laptops quite good for
radio. A couple sellers on Amazon have worked for me. Including one with
a real serial port. But then I upgraded my K3 with the K3S components so
now use a USB port.
73, tom w7sua
On 8/10/2013 9:24 AM, Jim Spears wrote:
Hi Bob,
Document Table 1, Line 7. speech = V/5*2^.5. which is same as Vrms/5.
Using measured RMS ratios, Vrms=15.3, 15.3/5 = 3V, compared to measured
5.24V.
Speech is rather undefined, so not too worried about the discrepancy. My
speech with no pauses is ~= Vrms / 3.
Really what is being
Hi Don,
On 6/20/19 9:21 AM, Don Wilhelm wrote:
> John,
>
> That connection is OK if you realize that your scope is reading the DC
> voltage developed by rectifying the RF from 1/2 of the load. You still
> have to use the power formula that is in the DL1 manual.
Well yes, power references are
Ken,
The DL1 is a 50 ohm load. I did specify that the formula was applicable
for a 50 ohm load.
For other loads, the formula is Vpeak squared divided by 8R.
It saves the trouble of converting to RMS and then using the more
familiar Vrms squared divided by R.
If you wish to derive the
Don , That may be peak to peak voltage squared decided by 400 for a 50 ohm
load.
Thanks 73 Ken K5DNL
On Thursday, June 20, 2019, 9:30:46 AM CDT, Bob McGraw K4TAX
wrote:
Here is a paper on the topic. This covers the correct procedure.
Here is a paper on the topic. This covers the correct procedure.
http://www.eng.auburn.edu/~troppel/courses/TIMS-manuals-r5/TIMS%20Experiment%20Manuals/Student_Text/Vol-A1/a1-12.pdf
73
Bob, K4TAX
Sent from my iPhone
> On Jun 20, 2019, at 8:38 AM, John Oppenheimer wrote:
>
> Using DL1 with
John,
That connection is OK if you realize that your scope is reading the DC
voltage developed by rectifying the RF from 1/2 of the load. You still
have to use the power formula that is in the DL1 manual.
I prefer to allow the 'scope to read the full peak RF voltage. Connect
the 'scope
Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
https://www.kn5l.net/ssbpower/
Question, is this technique correct?
John KN5L
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Help:
Thanks Eric. I suspected this, especially the continued support. Elecraft
has done an excellent job of not obsoleting older radios. I own three K3Ss
and it's comforting to hear the official word.
73,
John KK9A/4
Sent via the Samsung Galaxy 7 edge, an AT 4G LTE smartphone.
On Thu, Jun 20, 2019
Thanks Eric!!!
I had also asked on several occasions with no response.
I plan to order some upgrades after Huntsville.
> On Jun 20, 2019, at 3:12 AM, Eric Swartz - WA6HHQ, Elecraft
> wrote:
>
> Our current plan is to keep the K3S in the product line as long as demand is
> sufficient to
Our current plan is to keep the K3S in the product line as long as demand is
sufficient to economically produce it. We are certainly still shipping new K3S
orders weekly and have sufficient parts inventory to keep manufacturing them at
this time. We also are still strongly supporting existing
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