On Wed, 17 Sep 2008, Bill W5WVO wrote:
Actually, looking at transmission line SWR at the transmitter is a
poor way to adjust an antenna. To get it right, you need to use a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the antenna
Howard W. Ashcraft W1WF
hwa_AT_ashcraftfamily.net
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraf
> I just assembled K3/100 sn1617 - it also came with KPA3 manual Rev D,
> Jan 2008. No errata in my box. Also, no errata on your web site.
I just finished 1450 with KRX3. All of the manuals in the box were
one revision old. I printed copies of the most recent manuals on the
web and worked f
> Into a linear load, and I presume we have one here[A], there is no
> difference between dB relative to a voltage, using the 20 log10,
> voltage, formula and dB relative to the power corresponding to that
> voltage using the 10 log10. power, formula.
That's only true if the source and load imp
I just assembled K3/100 sn1617 - it also came with KPA3 manual Rev D,
Jan 2008. No errata in my box. Also, no errata on your web site.
Jerry W4UK
At 04:59 PM 9/17/2008, Ron D'Eau Claire wrote:
All of the acorn nuts go on the outside of the fan panel, Gary.
The new acorn nuts were introduced i
A dB is a well defined unit, and I don't see the problem with using it
as is in the K3. A dBV is also a well defined unit, although not often
used, but what the K3 calls dBV is not what is defined as a dBV.
As Chen says, this is really a nit, but having a dB scale will be
useful for a varie
This is a very nice scope and I thought I would offer it here before putting it
on eBay.
The 2337 is a 100 Mhz portable scope that includes a DMM in the front cover
that can also measure delay time. It is more compact than most Tek scopes and
is extremely rugged. It was designed to be used in
It is best to measure the SWR at the antenna. That ensures the actual SWR on
the feed line (and so feed line losses) are as low as possible.
Using an SWR bridge designed for 50-ohm lines will do the job. When the SWR
bridge reads something close to 1:1 the reactance will, by definition, be
close
If you have 1:1 SWR at the transmitter, you must have a 50+j0 load at
the other end of a 50 ohm coax, regardless of the line length. Using
a Smith Chart will just show a dot at the center. (Of course, if you
have a very lossy line, it could be a little off 50 ohms at the
load.) This also ass
An adequate and not too expensive vector analyzer is the VA1 by Autek
Research. It reads resistance and reactance (including its sign)
directly and also has a function that automatically calculates the Z
at your antenna even though you are measuring at the rig end of your
transmission line
I ordered a K3 at Dayton on 17th May and received a Katiegram on 9th Sept.
The KRX3 was shown on BO and I asked them to hold shipment until the subRX
could be shipped at the same time as the K3. I was told that would delay
shipment by approximately 2 months - i.e from mid Sep to mid Nov.
73, D
I should add that you CAN adjust an antenna for minimum SWR at the
transmitter, but when you do that, you are in all likehood
including some non-zero feedpoint reactance in the net impedance,
and this is being observed through the length of your transmission
line, which then becomes part of the ove
Actually, looking at transmission line SWR at the transmitter is a
poor way to adjust an antenna. To get it right, you need to use a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the antenna
feedpoint as possible. Adjust as close as y
Gary,
The SWR is being displayed when you press TUNE. The tuning power can be set
at TUN PWR, set it higher than 2 Watts.
Steef PA2A
K3 1184
- Original Message -
From: "Cranz Nichols" <[EMAIL PROTECTED]>
To: "LIST - elecraft"
Sent: Wednesday, September 17, 2008 11:53 PM
Subject: [E
I need to adjust the gamma matches on my 10/15M delta loop.
Is there a way to bypass the internal ATU and have the K3 display the SWR it
sees numerically?
Should dig out my old SWR bridge?
cln
WB5BKL
K3 #231
___
Elecraft mailing list
Post to: El
All of the acorn nuts go on the outside of the fan panel, Gary.
The new acorn nuts were introduced in May, 2008, and their use was
documented in Errata D3, dated May 7,2008 to the KPA3 manual.
The manual was subsequently updated to Rev E to include the errata items.
Rev E was released June 17. T
It is now alive and well after about 10 hours of build and
calibration/testing time. I did find a few very minor problems with the
assembly instructions that I will share with Elecraft.particularly with the
Fan assembly as the two bottom center acorn nuts interfered with the relay
of the KPAIO3 bo
On Wed, 17 Sep 2008 15:40:28 EDT, [EMAIL PROTECTED] wrote:
>Should I expect to see my KRX3 (no special filters on order with it)
>to be shipped by end of November?
Based on limited contact with Elecraft folks (they're neighbors), the
KRX3 seems to take a while to put through test and alignment,
You should be able to use the AFV readings instead of the voltage
measured with a DMM across the speaker - then using those values, enter
them into the calculations in the XG2 manual for calculating MDS.
73,
Don W3FPR
Björn Mohr wrote:
On 2008-09-17 00.26, "Lyle Johnson" <[EMAIL PROTECTED]> w
The K3's dBV function is a *relative* measure. It must be set to
whatever reference you wish by first using AFV. The calculation
measurement is true RMS. It is used for measuring things like MDS, AGC
slope, roofing filter attenuation and so forth.
So what's the correct procedure for measuring
I presume you meant to say Aug 1st 2007. That looks like about 5 months
from the date they started shipping KRX3s. I ordered one for my K3 in April
of
this year (right after the dx convention) My best calculation says I should
expect it next March, but other e-mail refers to K3s with KRX3
On 2008-09-17 00.26, "Lyle Johnson" <[EMAIL PROTECTED]> wrote:
> The K3's dBV function is a *relative* measure. It must be set to
> whatever reference you wish by first using AFV. The calculation
> measurement is true RMS. It is used for measuring things like MDS, AGC
> slope, roofing filter at
My KRX3 arrived today (Yippee in time for RTTY contest). Thanks to
the Aptos gang for a nice kit to upgrade S/N682. Ordered last august 1st.
Regards Ed KE3D
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to po
When breaking out K3 Accessory Connector leads to RCA jacks, do all return
connections for PTT, Key Out, ALC, +12Vin,
Power On, Digiout0 and Digiout1 go to either pins 5 or 12?
Bud W3LL
[EMAIL PROTECTED]
___
Elecraft mailing list
Post to: Elecraft@m
Ann Tekatch asked:
> Things are going really well with the build of s/n 1591 (I had the power
> on tonight for the initial power-up test - so exciting!!!) but tonight
> when I went to put the TCXO module on the KREF board, I discovered that
> the leads on the module are too long to allow its bo
Good news. I am still waiting having been notified in late August, I expect
this is because I ordered matched filter offsets and Elecraft are waiting
for a suitable match - the offset is a random process.
Let us know how you get on with the assembly, especially if there are any
issues with an ol
I have been unable to post the "N2CQ QRP Calendar"
on the QTH.net e-mail lists. Testing this without the calendar text.
Ken Newman
Woodbury, NJ
[EMAIL PROTECTED]
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to pos
Lateral thinking. Sounds good to me
David
G3UNA
>
> From: "Geoffrey Mackenzie-Kennedy" <[EMAIL PROTECTED]>
> Date: 2008/09/17 Wed AM 09:33:31 BST
> To: "Elecraft Discussion List"
> Subject: Re: [Elecraft] K3 dbV in 2.38
>
> Would it be useful to call it Vdb, i.e. a voltage measurement not
>
Dear Elecrafters,
For all those who are waiting their KRX3 :
My kit has been sent 11 September by US Postal Service (Priority mail) and
has been delivered this morning by the French Post.
It had been ordered with my K3 kit on 8 September 2007.
Raymond, F4FNT
K3/100 # 615, K2/100 # 5,636
__
Would it be useful to call it Vdb, i.e. a voltage measurement not
necessarily using the 1V RMS standard reference?
73,
Geoff
GM4ESD
On Tue, 16 Sep 2008 15:40:04 -0700, Lyle Johnson wrote:
Maybe dBv stands for dB "variable," not dB with respect to a volt.
Not with respect one volt, but v
Lyle Johnson wrote:
We have a total of three characters available, and we wanted to express
that this was a dB value, and it was voltage based. So we used dBV.
Into a linear load, and I presume we have one here[A], there is no
difference between dB relative to a voltage, using the 20 log10
31 matches
Mail list logo
