Isn't there some authorized amateur activity in the 600
meter band? I saw someone post that they had a beacon going
aroun 500 khz.
Dave W7AQK
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: elecraft@mailman.qth.net
Sent: Sunday, July 06,
Ed Muns wrote:
What DSP bandwidths were you using and where did you have your crystal
filters engaging? There is only a 65 Hz bandwidth difference between the
400 and 250 crystal filters and both are wider than the what is needed
for 170 Hz shift RTTY. The crystal filter function is to
David Woolley (E.L) wrote:
Ed Muns wrote:
What DSP bandwidths were you using and where did you have your crystal
filters engaging? There is only a 65 Hz bandwidth difference between the
400 and 250 crystal filters and both are wider than the what is
needed
for 170 Hz shift RTTY. The
FYI, the DSP filter in the K3 follows the following formula for shape factor
according to Lyle KK7P:
Shape Factor = (6 dB BW) / (6 dB BW + 300 Hz)
Oops...no coffee yet. Make that
Shape Factor = (6 dB BW + 300 Hz) / (6 dB BW)
73, Bill
--
View this message in context:
I agree with Bill. Every instance of fan noise that I recall being
posted here ended up being assembly error (or more properly,
oversight). And since you say that they CAN be quieted down with
adjustment, I would suggestion checking for a wire touching the blades
when they spin. Loosening the
Bill
I can't recall seeing that figure published before; where would I look for that
figure?
David
G3UNA
snip
The purpose of the roofing filter is mainly to reduce strong (approximately
S9+30) signals from over-driving the ADC in the DSP. If they do that, then
the DSP determines the
never mindthe bnc is it .
sri for bandwidth,
bill
now that I received my katiegram for the second receiverI have
read the instructions. Looks like I need to make a decision whether
to hook the 2nd rcvr aux in to the unused ( non- transmitting) KAT3
ANT port...
or the ext
David Cutter wrote:
Bill
I can't recall seeing that figure published before; where would I look for
that figure?
David
G3UNA
snip
The purpose of the roofing filter is mainly to reduce strong
(approximately
S9+30) signals from over-driving the ADC in the DSP. If they do
I suspect I might know about this under another name, but I want to make sure
that I haven't missed something important. Just what is the R91 mod?
My K3 is #444.
Thanks,
Tony, KM0O
--
View this message in context:
http://www.nabble.com/What-is-the-%22R91-mod%22--tp18316001p18316001.html
Sent
Tony,
R91 is *not* a mod by itself. You did not miss anything at all.
When installing the KRX3, the builder is asked to meaure the value of
R91 and add a parallel resistor if it is 100 ohms. If it is 22 ohms, do
nothing.
If you wish to check and modify R91 to 22 ohms in your K3 without
I'm happy to report birth of K3 #1198:-
Ordered 17 Feb 08
Katiegram 29 June
Shipped 2 July
Back-ordered KRX3, KDVR3, 6k filter
Received safely (in rural Somerset) 4 July!! UPS were really quick!
Built apart from 100W PA 6 July
Thanks to all at Elecraft including Wayne, Eric, Katie, Madelyn and
Thanks Bill, it was the first 2 that were of interest.
David
G3UNA
David Cutter wrote:
Bill
I can't recall seeing that figure published before; where would I look for
that figure?
David
G3UNA
snip
The purpose of the roofing filter is mainly to reduce strong
OK, now that I'm slowly getting my station rebuild to the point where
I'm operating my K3 on a regular basis, I'm noticing that the AGC
seems to be kind of sub-optimal. There are large differences in audio
volume when receiving different strength signals. I have not been
directly comparing the
Have you tried adjusting the CONFIG:AGC SLP parameter? I've set mine
to the maximum value, 15, for flattest AGC slope.
Bob NW8L
On Mon, Jul 7, 2008 at 8:13 AM, S Sacco [EMAIL PROTECTED] wrote:
OK, now that I'm slowly getting my station rebuild to the point where
I'm operating my K3 on a
I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not
aggressive enough - that is, the volume difference is too large between weak
and strong signals.
73, Bud N7CW
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Cunnings
Sent:
2. 100 dB dynamic range of DSP. I'm not going to search for the exact
source but this is often quoted by manufacturers as the practical limit of
current DSPs using 24-bit ADCs. Theoretically it should be higher based
only on 24-bit ADC resolution but practically it's limited by other factors.
I agree, I also have mine set at 15 and there does seem to be a large
difference in the audio level of weak and loud stations... Jim K4JAF
- Original Message -
From: Bud Semon N7CW [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Monday, July 07, 2008 9:26 AM
Subject: RE:
... There are large differences in audio
volume when receiving different strength signals.
There are two AGC parameters that should help.
1) AGC THR
This sets the signal strength which must occur before AGC is activated.
It is defaulted to the several microvolts range. If you are
Bill,
I find the diversity option interesting and I imagine that it will be a very
useful feature on topband. In what other situations do you find it useful?
I have never tried diversity myself, what would the difference be between a
filter matched to the specs provided Elecraft and a set of
Isn't there some authorized amateur activity in the 600
meter band? I saw someone post that they had a beacon going
aroun 500 khz.
Dave W7AQK
The FCC issues special experimental licenses for various reasons. These are
not Amateur
CONFIG:AGC THR 001
(default is 5)
Sorry, I just checked and I see 002 is the lowest allowed value in the
present firmware release.
73,
Lyle KK7P
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the
On Mon, 7 Jul 2008 09:55:58 -0500, Jim Cox [EMAIL PROTECTED] wrote:
I agree, I also have mine set at 15 and there does seem to be a large
difference in the audio level of weak and loud stations... Jim K4JAF
- Original Message -
From: Bud Semon N7CW [EMAIL PROTECTED]
To:
I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not
aggressive enough - that is, the volume difference is too large
between weak and strong signals.
I just measured it. From a signal at the AGC threshold (-104 dBm if AGC
THR is set to 005) to a signal 100 dB stronger,
_
From: Gary Nichols [mailto:[EMAIL PROTECTED]
Sent: Monday, July 07, 2008 11:15 AM
To: elecraft@mailman.qth.net
Subject: audio problems?
Hello all, CW is working fine with K3 #716 but trying SSB there seems to be
a problem possibly related to the headset/boom
With regard to diversity reception on bands other than 160m --
When 6-meter sporadic-E is very intense and present over a fairly large area
between two stations, a phenomenon occurs where the signal will come in
alternately at a higher angle and at a lower angle, fading back and forth,
on
Thanks, Lyle -
I've made those changes, and will see how they work.
Appreciate the help!!
73,
Steve NN4X
On Mon, Jul 7, 2008 at 11:08 AM, Lyle Johnson [EMAIL PROTECTED] wrote:
... There are large differences in audio
volume when receiving different strength signals.
There are two AGC
Björn Mohr SM0MDG wrote:
I find the diversity option interesting and I imagine that it will be a
very
useful feature on topband. In what other situations do you find it useful?
I have never tried diversity myself, what would the difference be between
a
filter matched to the specs
On Mon, 7 Jul 2008 11:41:03 -0400, Gary Nichols [EMAIL PROTECTED] wrote:
[snip]
Hello all, CW is working fine with K3 #716 but trying SSB there seems to be
a problem possibly related to the headset/boom mic I had been using with
other radios. If I turn the monitor up enough to hear anything in
To those of you SSB ops who won't use VOX because every implementation of it
you've ever used basically sucked -- Try the K3! I just set it up using my Heil
Pro-Set for the first time, and it works just as you think it should. Very
smooth, no dropped syllables, no falsing -- amazing. It feels
Steve, please report back with the results of your change.
I have my AGC slope set to 3 or 4 IIRC. Anything more than that and the
rig just sounds flat with noise signals all being the same level, just
like all the rigs that I've owned before.
- Keith N1AS -
- K3 711 -
-Original
Ok settings gurus, What values of K3 AGC parameters will make the K3
most closely mimic the AGC in the K2?
- Keith N1AS -
- K3 711 -
___
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber
Yup, it's pretty good..
73
Stewart G3RXQ
On Mon, 7 Jul 2008 09:59:51 -0600, Bill W5WVO wrote:
To those of you SSB ops who won't use VOX because every
implementation of it you've
ever used basically sucked -- Try the K3! I just set it up using
my Heil Pro-Set for
the first time, and it works
Hi William,
1. I apologize for the mis-marked 2.8 kHz filter cardboard box. We
usually dispose of and marked up boxes and use new ones when shipping
filters. Your filter should be good, but we'll replace it if needed.
2. We are removing L3 on all KANT3s now at the factory as we found this
Bill
I don't follow how filter offsets degrade oscillator tracking, ie to make a
beat frequency. Sorry if I'm being thick.
David
G3UNA
What would be the effect of unmatched filters? You would have a beat
frequency, such as I mentioned with Orion above, which would be the
difference in
With two synthesizers, our software must calculate the proper PLL
divider and reference frequencies for each one. When setting the sub and
main to the same RX frequency, if the filter offsets set in the menu are
different this can cause small rounding errors in the synthesizer
frequency
DSP based VOX is very cool. :-) We can do some interesting things to
avoid dropped first syllables.
Eric WA6HHQ
Stewart Baker wrote:
Yup, it's pretty good..
73
Stewart G3RXQ
On Mon, 7 Jul 2008 09:59:51 -0600, Bill W5WVO wrote:
To those of you SSB ops who won't use VOX because every
Is that do do or can do ?
73
Stewart G3RXQ
On Mon, 07 Jul 2008 10:25:32 -0700, Eric Swartz - WA6HHQ, Elecraft
wrote:
DSP based VOX is very cool. :-) We can do some interesting
things to
avoid dropped first syllables.
Eric WA6HHQ
Stewart Baker wrote:
Yup, it's pretty good..
73
Stewart
'Do' as in 'already do'.. ;-)
Our current DSL firmware is designed to provide an extremely fast VOX
that does not drop much, if any, of the first syllable.
73, Eric
Stewart Baker wrote:
Is that do do or can do ?
73
Stewart G3RXQ
On Mon, 07 Jul 2008 10:25:32 -0700, Eric Swartz - WA6HHQ,
I have a recent model K2 that has an interesting problem: on each key closer,
there is a pop in the speaker. This is present at times in QSK or not QSK. It
is present with paddle connected to radio, or Winkeyer external keyer, same
problem.
It is present in test mode or not test mode. The pop
Eric - WA6HHQ wrote:
'Do' as in 'already do'.. ;-)
Our current DSL firmware is designed to provide an extremely fast VOX
that does not drop much, if any, of the first syllable.
Let me guess. Put the audio stream in a short delay line and offset the
initiation by the amount of time it
Eric,
Is there any news on when we can expect the release of the DVR?
--
View this message in context:
http://www.nabble.com/K3--Digital-Voice-recorder-tp18324569p18324569.html
Sent from the [K2] mailing list archive at Nabble.com.
___
Elecraft
Is there an easy way for the KRC2 and K3 to give an output for 6m? My problem
- quite common I expect, is to switch antennas between HF and 6m. I bought a
KRC2 and have just finished building it. However,I find there is not a 6m
output. I suppose I could work on the NOT 6m principle and energise
Mike,
The coding for the K3 6 meter band is the same as the KRC2 60 meter band
(and the KRC2 does not decode the combination used by the K3 for 60
meters).
Connect the KRC2 to the K3 and verify that the /60 output goes to ground
(check with ohmmeter) when the K3 selects 6 meters.
I
Thanks for the input, this is really interesting!
On 2008-07-07 19.23, Eric Swartz - WA6HHQ, Elecraft [EMAIL PROTECTED]
wrote:
With two synthesizers, our software must calculate the proper PLL
divider and reference frequencies for each one. When setting the sub and
main to the same RX
Nice! It´s years and years since I´ve used a VOX that worked
correct.
Sure looking forward to receive my K3. Too bad I have to wait
another while, oh well there are plenty other things to do but radio.
73 Jim SM2EKM
---
Eric Swartz - WA6HHQ, Elecraft wrote:
DSP based VOX
I have a nice big SWR meter - CN-801 HP so I can quickly see if
there's any smoke going up the coax. What could be simpler?
Simon Brown, HB9DRV
I have the same meter, always in line. No problems with Test mode here.
Paul
N4LCD
___
Elecraft
My problem is
that I'm not sure which filters I should add to my order for a primarily CW
use radio.
Probably none other than the included 2.7 kc filter, unless you're contesting.
You can always add narrow filters later if you find out that you
really need them.
Paul
N4LCD
Hi,
I am back on the Elecraft list after being gone for quite a while. I have a
K3/100 coming in the next month or 2, and now I am thinking about how it is
best to power it. The K3 has a nice small footprint and that will be much
welcomed in my small operating area. And, I don't want to dwarf
Ok settings gurus, What values of K3 AGC parameters will make the K3
most closely mimic the AGC in the K2?
- Keith N1AS -
- K3 711 -
Well, my choice is high threshold, steep slope and low AF gain!
AGC THR 8
AGC SLP 4
73' Val, LZ1VB
K3 516
K2 2745
Bill,
David you may be suggesting that in theory but I would pay
*close attention* to what W0YK says. Ed wins many RTTY contests
including several current world records from P49X, and results
sometimes speak louder to me than theory (and I'm an engineer
if that means anything).
Ed and
Joe Subich, W4TV-3 wrote:
Bill,
David you may be suggesting that in theory but I would pay
*close attention* to what W0YK says. Ed wins many RTTY contests
including several current world records from P49X, and results
sometimes speak louder to me than theory (and I'm an engineer
Val-LZ1VB wrote:
Well, my choice is high threshold, steep slope and low AF gain!
AGC THR 8
AGC SLP 4
Sounds about right Val! See the K2 AGC curve here about 2/3 of the way down
the page:
http://www.cliftonlaboratories.com/receiver_agc_curves.htm
73, Bill
--
View this message in
Being tha t it was mentioned that best responses seem to be with a
roofing filter wider than 300Hz and then he mentioned the 250Hz filter
wouldn't you deduce that he meant the 370Hz filter which Elecraft calls
250Hz? I mean maybe I'm jumping to conclusions here but that was pretty
clear to me.
KFL3A-250 K3 250 Hz, 8 pole filter
- Original Message -
From: Bill W4ZV [EMAIL PROTECTED]
That's interesting since there isn't a 250 Hz roofing filter. There's a
370
Hz and a 224 Hz, but no 250 Hz. What did you use for the 250 measurement
above or is that a calculated result? At
A little bit of DSP delay works wonders :-)
73
Stewart G3RXQ
On Mon, 07 Jul 2008 11:03:49 -0700, Eric Swartz - WA6HHQ, Elecraft
wrote:
'Do' as in 'already do'.. ;-)
Our current DSL firmware is designed to provide an extremely
fast VOX
that does not drop much, if any, of the first syllable.
After performing flawlessly for over a year my KPA100 has died for the second
time in about 3 months. I was finishing a nice 20 minute QSO on 10M CW last
week when the rig's lights flickered and the power supply shut down. Now
the power cord fuses blow and there appears to be a short when the
Brett Howard wrote:
Being tha t it was mentioned that best responses seem to be with a
roofing filter wider than 300Hz and then he mentioned the 250Hz filter
wouldn't you deduce that he meant the 370Hz filter which Elecraft calls
250Hz? I mean maybe I'm jumping to conclusions here but
All,
My K3 (with one extra roofing filter for CW) is not here yet, so I am asking
this question without direct experience.
It will be interesting to do an A/B comparison to see how the receiver sounds
with/without the narrow crystal filter for a given bandwidth.
I suspect this kind of test is
Bill,
I'd do the resistence checks shown in the KPA100 manual under Alignment and
Installation. It's page 40 in my old manual. Anyway it's Q1, Q2, Q9 and D13.
All the final and driver circuits.
Kurt
- Original Message -
From: nz0t [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Direct quote from the message:
Much of the narrowing is due to the very humped (Gaussian)
nature of the narrow crystal filters but the best responses
for RTTY seem to be with a roofing filter wider than 300 Hz
(the 250 Hz/8-pole) and/or keeping the DSP filter wider than
250 Hz with or
Bill,
Remove the shield and give it a good visual inspection first - look for
any evidence of overheated components.
Then check the diodes in the T/R switch - preferably with a diode test
function of a DMM, but the ohmmeter will work too - check both the
forward and reverse connections.
Check
A single page errata sheet to the sub-RX manual was posted on Elecraft's
website this morning. It is rev. A1, dated June 30th. The full URL is ...
http://www.elecraft.com/manual/E740126E_KRX3_Inst_Operate_Errata_Rev_A1.pdf
73,
Gary KI4GGX
___
Name here is George Osier , N2JNZ from Ogdensburg , NY
A question .. I have a K1 .. is there any way to have 10 meters
on it ?? I have 15 , 20, 30 and 40 now.
Thanks !!!
George , N2JNZ
___
Elecraft mailing list
Post to:
I am having very good performance from the SEC 1223 which is the same supply
I use with the K2/100. If it does generate any noise I have yet to hear it.
Bruce-W8FU
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Thomas Kuehl
Sent: Monday, July 07, 2008
64 matches
Mail list logo
