On 3/31/2020 8:52 PM, John K9UWA wrote:
Cut the hardline to multiples of 1/2 wavelength and the swr will be 1 to 1 on
both
ends. 50 in 50 out.
Did you notice that this is for an all-band antenna?
73, Jim K9YC
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Elecraft mailing
On 3/31/2020 8:36 PM, Don Wilhelm wrote:
What the roofing filters will do is keep the receiver from reducing the
hardware AGC for stations which are within the roofing filter passband.
In addition, when the DSP IF filters are set to about the same width as
the roofing filters, the two filters
Cut the hardline to multiples of 1/2 wavelength and the swr will be 1 to 1 on
both
ends. 50 in 50 out. In this case the OP needs around 200 feet. Once your get
the
velocity factor for the 1/2" hardline... that is ballpark 80 to 83%. for 3.540
mhz is
265 feet x .8 = 212 feet. If you don't
Hopefully that we will remember that the DSP filter skirts are steeper
than the crystal filter skirts, so judicious use of the HiCut and LoCut
will provide us with a better passband than narrow roofing filters.
What the roofing filters will do is keep the receiver from reducing the
hardware
You don't need an UNUN with the system. Connect the 1/2" CATV 75 ohm
hard line to the feed point on the antenna, and use a short jumper of
RG8X or RG6 between the hard line to the radio for convenience.
73
Bob, K4TAX
On 3/31/2020 1:06 PM, ae...@carolinaheli.com wrote:
The 200' run is Cable
Remember, different brands of 2.1 or 1.8 filters are not necessarily equal.
One must realize the shape factor is more important than the published BW.
Just because one radio filter is 1.8 kHz does not mean another 1.8 kHz BW is
the same.
Bob, K4TAX
Sent from my iPhone
> On Mar 31, 2020,
Tripod screws are 1/4-20, so an angle bracket and a screw and a wingnut could
help. Tilt the head over 90º.
I did something similar to attach a Nagoya NMO base station mount to a tripod.
Photos and description here. I’ve since replaced the hex nut with a wingnut.
I raised this issue after getting my AX1 with tripod adaptor, since it fit
neither of my consumer tripods. You need either a really small tripod head or a
adjustable ball-type adapter that elevates the AX1 up enough to use the BNC
plug to the radio.
Here is a link to one small ball head
I would like to buy a KDVR3 for my K3. Elecraft is not selling them anymore.
If anyone has one that they would sell, please contact me off list. Thanks. 73
de Carl N8VZ
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Elecraft mailing list
Home:
Al,
How about sharing your settings?
-de John NI0K
Al Lorona wrote on 3/31/2020 1:47 PM:
Jack beat me to the comment I was going to make. Far be it from me to contradict a
seasoned contester like W3LPL, nor to dismiss the comments of many others, but I wonder
how many "the K3 sounds bad on
I typically use Hi Cut the most, Lo Cut once in a while and almost never
use Width in SSB mode. For me the 2.1 kHz filter works swell in this
application.
In the late '90s I bought a TS-850s which was fitted with a 1.8 kHz
factory accessory filter. I couldn't get rid of it fast enough and
Having the 1.8 kHz in my K3S, I know what and how it works.
I work 2 SSB traffic LSB nets which both have LSB nets which are 2 kHZ above
my net frequency. That means at least 700 Hz to 1000 Hz of their primary
signal is in my receiver passband. The 1.8 kHz filter, the DSP at 1.8 kHz and
On 3/31/2020 3:18 PM, Buck wrote:
Why go halfway? I would go with the 1.8 as a roofing filter.
I tried that and didn't like the result. I prefer 2.1 kHz 8 pole
73, Jim K9YC
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Elecraft mailing list
Home:
I made an adapter
I uses a flat aluminum bar with a hole drilled and tapped for the camera mount
and then another hole with dnc adapter for coax and antenna.
Make short as possible fron tripod.
Bill
WF9M
> On March 31, 2020 at 5:16 PM rwwatson mailto:richard.watson15...@gmail.com > wrote:
>
>
Why go halfway? I would go with the 1.8 as a roofing filter. Crank the
DSP down to 1.6 and slew the passband to get the best readability.
Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com
On 3/31/2020 12:17 PM, John Simmons wrote:
David,
I'm looking to upgrade my filters for SSB. I have the
Hello list,
I now almost have everything I need for my kx3 portable setup. I want to use
the ax1 with an axt1 adapter and my tripod has a removable camera plate
which seems to prevent the coax from attaching to the axt1. any suggestions
on a good tripod.
--
Sent from:
Hi Grant,
I'll do it right, you can take that to the bank
73
Frank
W3LPL
- Original Message -
From: "Grant Youngman"
To: donov...@starpower.net
Cc: "Elecraft Refl"
Sent: Tuesday, March 31, 2020 9:03:14 PM
Subject: Re: [Elecraft] Transceiver Test Bed at W3LPL
If you’re
If you’re going to do this, I trust it won’t be “anecdotal”, and that you have
the equipment necessary to provide concrete measurable and rmost importantly,
repeatable, results. Maybe you do. But anything else is just opinion.
Grant NQ5T
> On Mar 31, 2020, at 4:46 PM, donov...@starpower.net
Hi Jim,
I'll try a variety of transceivers as QRM generators and document
the good and the bad...
tks
73
Frank
W3LPL
- Original Message -
From: "Jim Brown"
To: "Reflector Elecraft"
Sent: Tuesday, March 31, 2020 8:16:59 PM
Subject: Re: [Elecraft] Transceiver Test Bed at
The 200' run is Cable TV hardline (1/2") 75 Ohm, that's where the UnUn would go
(maybe).
Jerry Moore
Cell: 803-431-1870
-Original Message-
From: Victor Rosenthal 4X6GP
Sent: Tuesday, March 31, 2020 1:58 PM
To: elecraft@mailman.qth.net; ae...@carolinaheli.com
Subject: Re: [Elecraft]
My measurements of N6TA's FTDX5000 about three years ago found it to be
pretty clean on SSB. http://k9yc.com/FTDX5000_Report.pdf
73, Jim K9YC
On 3/31/2020 12:39 PM, donov...@starpower.net wrote:
I'll also use my FTdx5000s as QRM radios
Hi Barry,
Good ideas. It will be an interesting challenge to eek out the best possible
performance from each radio-under-test. We'll learn a lot.
tks
73
Frank
W3LPL
- Original Message -
From: "Barry"
To: donov...@starpower.net, elecraft@mailman.qth.net
Sent: Tuesday,
Frank,
I can't speak to the other radios, but you do need to fiddle the
values of the AGC on the K3s to get the best out of the radios. I think
the defaults are just to see if the radio works or is where it was left
while undergoing QC at Elecraft.
BTW: I'm glad one of us is doing
Hi Jim,
Very good ideas! I'll also use my FTdx5000s as QRM radios and
also try the K3s to see if the there is a measurable difference
in QRM
tks
73
Frank
W3LPL
- Original Message -
From: "Jim Brown"
To: elecraft@mailman.qth.net
Sent: Tuesday, March 31, 2020 7:31:10 PM
On 3/31/2020 10:44 AM, donov...@starpower.net wrote:
I welcome constructive comments about my test bed, test procedures and
results.
Hi Frank,
A worthwhile experiment. Suggestions. Use dirtier QRM rigs. Low cost
(less than FTDX5000) Yaesu rigs have lots of RF IMD on SSB, even when
not badly
That explains why I was getting so many startled looks and why so many children
were running for their lives the last time I went to Whole Foods :-) :-)
Grant NQ5T
> On Mar 31, 2020, at 2:43 PM, Bob McGraw K4TAX wrote:
>
> Wear clothes too as the public will appreciate that.
>
Yes correct. However as one will reduce the loss in the CATV coax and
will likely increase the loss in the matching network at the base of the
antenna. The mismatch loss in the CATV coax is 0.205 dB, based on
earlier calculations. I would question the loss in a broadband network
to be
The response from K4TAX was fine if you’re willing to settle for >2:1 SWR at
the antenna. If you want a better match, consult the book, “Understanding,
Building and Using Baluns and Ununs” – Jerry Sevick W2FMI, which is/was
available at the ARRL store. I have a copy and found page 92 talks
Yes, but with a 1.8 kHz filter, the adjacent QRM goes away as well.
One can't have good quality from a wide bandwidth if the adjacent
station is splattering over into your receiver bandwidth. Something has
got to give. After all, it is communications quality audio. Narrow
the bandwidth to
John,
I have either 2.8 or 2.7 KHz filters in my K3s; I just don't
remember which I ordered. I rely on the bandwidth of the filter that
follows which is created by DSP. It works fine for me. I know this setup
has stop bands that are around 105 db, but I don't know what the shape
factor
Subject: [Elecraft] K3 SSB filters
Message-ID: <6337fc8e-6d4b-5a8e-1e3c-c45e1ecde...@pinewooddata.com>
Content-Type: text/plain; charset=utf-8; format=flowed
With the recent experience in SSB? contests, I'm thinking of upgrading
my SSB filter(s). Currently for SSB I have only the 2.8 filter.
Valid points. As I pointed out in another thread on another forum,
while they only mention shirt and shoes, pants are implicit.
Scott
AD6YT
On Tue, Mar 31, 2020 at 11:44 AM Bob McGraw K4TAX wrote:
>
> Just figure that most events will be cancelled between now and August.
> Maybe even later.
Jack beat me to the comment I was going to make. Far be it from me to
contradict a seasoned contester like W3LPL, nor to dismiss the comments of many
others, but I wonder how many "the K3 sounds bad on SSB" comments occur because
of operator error in setting the AGC and gain controls
Just figure that most events will be cancelled between now and August.
Maybe even later. Figure on staying home, get outside in the yard, get
some exercise, and do what the XYL says. Just stay out of crowds and
stay out of the public. Buy 4 weeks of groceries at at time. Just wear
a
I thought I was a master at making a BFD out of anything. I am not worthy!
Eric KE6US
On 3/31/2020 10:44 AM, donov...@starpower.net wrote:
During the Coronavirus crisis many of us have much more time than
usual for serious technical experimentation and testing.
I'm building a transceiver
So you end up with < 2:1 SWR on the line. Actually TLW shows the input
to the line SWR as 1.87:1, at the load 2.15 and the total loss at 28MHz
as 1.017 dB. Nothing wrong with those numbers. You don't need a 2:1
UNUN.
Keep the length of RG6 to a minimum as it has higher loss than the 1/2
That CATV hard line is pretty low loss, so the excess loss from the
small mismatch isn't much. I wouldn't worry too much about the impedance
mismatch if your radio has the tuner installed. Hook everything up with
the CATV hard line, no Unun, and if the tuner makes the radio happy,
declare
Forgot to add: I used 28 MHz for the calculations in my previous email.
Losses will be lower on lower bands.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 31/03/2020 19:39, ae...@carolinaheli.com wrote:
I'm about to pull the trigger on a Hustler 6BTV
I don't think you need a unun because the additional loss due to SWR
running RG/6 at 2:1 is only 0.381 dB, and the unun itself would
certainly have some loss.
But the loss in 200' of RG/6 even at 1:1 is about 2.9 dB! That is almost
half your power. RG/8 would have only 1.9 dB loss, and with a
Seems to me we can pretty well assume that EVERYTHING is or will be cancelled
for the forseeable future ….
For those of us that can, we need to be staying at home and staying safe.
There’s always another hamfest :-)
Grant NQ5T
> On Mar 31, 2020, at 12:14 PM, Ken G Kopp wrote:
>
>
During the Coronavirus crisis many of us have much more time than
usual for serious technical experimentation and testing.
I'm building a transceiver test bed and I'll regularly report the progress
of my test setup, procedures and results. The intent of my test bed
is to document the
On Tue, Mar 31, 2020, 11:39 Ken G Kopp wrote:
> -- Forwarded message -
> From: ARRL Members Only Web site
> Date: Tue, Mar 31, 2020, 10:12
> Subject: Special Bulletin- More Event Cancellations, ARRL Digital Editions
> off-line
> To:
>
>
> More iconic Northwestern Division event
I'm about to pull the trigger on a Hustler 6BTV (6-Band, 80, 40, 30, 20, 15,
10 meters). It will be temporarily installed (with radials) about 200' away
from my house. I'd like to run CATV "hardline" but I'm not sure how to get a
2:1 UnUn with a wide enough bandwidth on the antenna side (the
-- Forwarded message -
From: ARRL Members Only Web site
Date: Tue, Mar 31, 2020, 10:12
Subject: Special Bulletin- More Event Cancellations, ARRL Digital Editions
off-line
To:
More iconic Northwestern Division event dominoes are falling as a result
of the COVID-19 pandemic. I
I believe what Frank is referring to is not Tx audio, but receive audio during
times of very heavy band loading, which pretty much occurs only in busy
contests such as CQ WPX SSB last weekend. During these times stations are
basically on top of each other or very closely spaced. We tend to hear
David,
I'm looking to upgrade my filters for SSB. I have the 2.8 filter
installed, which has steeper skirts than the 2.7. I'm wondering if the
2.1 would have a noticeable enough effect to justify the cost.
-de John NI0K
David Smith wrote on 3/31/2020 10:26 AM:
Been interesting reading the
The K3 Utility help explains what gets EE INIT-ed.
Glad it is working.
Keith WE6R, Elecraft K3 Tech
On Mon, Mar 30, 2020 at 8:47 PM Martin Sole wrote:
> Keith,
>
> Many thanks for the heads up. I did the gain calibration instinctively as
> I did not know if it would be modified by the EE-Init
Been interesting reading the comments on SSB contesting and filtering. As a
serious SSB contester from way back in the 80s, side rejection from other
contesters (especially where we are all bunched up on 40 meters and also when
the shortwave broadcast stations come on) has always been a topic
Not observed on my K3S, sn 10163 radio. And nothing shows on my P3.
73
Bob, K4TAX
On 3/30/2020 5:39 PM, Buck wrote:
How about this one? K3S CW mode. Tone at 14.053.953 with shift at 650
Hz, lox cut at .10 High cut at 1.20. Same tone at 7.026.765 and
21.074.113 but weaker. The tone is
I have, in my K3S, the standard 2.7 kHz filter for transmit and often
use the 1.8 kHz filter for receive to deal with QRM. It is necessary to
adjust the SHIFT in order to improve copy when the 1.8 kHz filter is
active. Yes, this is perfectly normal, the 1.8 kHz filter is not going
to allow
Having used a K3 for a few weeks sometime back, and now having a K3S on
my desk for about 3 years, I can attest that there is a noted
improvement and difference in the SSB receive audio with my K3S. I did
wait on buying a K3S but I did so, only after learning of the improved
SSB receive
Hi John,
There’s a nice writeup from Wayne and Eric here:
https://elecraft.com/pages/k3s-crystal-roofing-filters
Perhaps that will help. It certainly helped me.
73 de AG7TX
David Thompson, AG7TX
Jack of All Trades
Master of None
dbthomp...@me.com
> On Mar 31, 2020, at 08:00, John Simmons
With the recent experience in SSB contests, I'm thinking of upgrading
my SSB filter(s). Currently for SSB I have only the 2.8 filter. What are
thoughts about other SSB filters? I know when I narrow the bandwidth to
1.8 the intelligibility goes down.
-de John NI0K
I upgraded of my two K3's recently and have left over parts..
If you have a legacy K3, and are interested in having some spares, here's
your chance.
1x - KIO3A (3 board set) I/O interface
1x - KXV3A Transverter Interface
4x - KSYN3 synthesizer module
If interested, let me know via
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