Another factor at play is the sensitivity/efficiency of the headset. For a
given power level, different headsets will deliver different sound levels to
the
ear.
In the case of my in-ear monitors, I found a significant amount of
attenuation of the K3's headphone output was needed to:
The turn of the screw method for tightening (used for many nut and
bolt fasteners) is appropriate with UHF connectors: firm finger tight,
and then use a tool (pliers) to tighten an additional quarter-turn.
If you can remove the shell without using a tool, it's too loose.
-- Eric K3NA
Gents --
I am not sure where the misinformation began that I use 5-pole
filters. None of the K3s used by Radio Expeditions, and none of my
personal K3 radios, use 5-pole filters (other than the stock filter).
My personal filter configuration at the time I bought my radios was:
2.7 kHz
Hi Wayne --
I always get nervous when I see diodes proposed to clip strong RF.
One of the biggest problems we have in a multi-transmitter site
(DXpedition or multi-TX contest station) is IMD generated by diodes
rectifying RF and re-radiating the result back into the local
environment.
said the following:
Eric, is this a simple resistor or ?
BTW, TU for the NCJ articles on TX/RX.
73 de Billy, AA4NU
-Forwarded Message-
From: Eric Scace K3NA e...@k3na.org
Sent: Apr 5, 2009 9:21 PM
To: Maarten van Rossum pd2r.maar...@gmail.com
Cc: Elecraft Group elecraft
I have very sensitive in-ear monitors. The K3 (and the Orion, and
possibly other radios) has significant hiss. I inserted an attenuator
and knocked the hiss down below my ability to detect it. There is
plenty of audio range remaining.
You may find 10 to 20 dB will help.
Hi --
I have an extra microHam cable set for the Elecraft K3 or K2
available (DB37-EL-K3). List price for a new cable is US$79 + shipping.
I will sell for $60 + shipping.
Please contact me directly -- please don't respond to the whole
list! Thanks.
73,
-- Eric K3NA
Did you set the Line In gain control to a value 0?
on 09 Mar 05 10:43 Bud Governale, W3LL said the following:
I can't get any transmit audio via the Line-In connector.
Connecting the Mic cable to the rear panel MIC connection produces good
transmit power and audio.
I know audio is coming
for the idea, why not put it on the reflector?
David
G3UNA
- Original Message -
From: Eric Scace K3NA e...@k3na.org
To: d.cut...@ntlworld.com
Sent: Thursday, March 05, 2009 4:22 PM
Subject: Re: [Elecraft] K3 birdies - question?
I wonder if a string of suitable ferrite beads would be enough Z
Hi --
I'm seeking advice on a feedback problem.
Scenario:
PC line out - microKeyer - K3 mic in (Note 5)
PC line in - K3 line out. (Note 1)
Note 1: microKeyer is bypassed so that stereo gets delivered to the
computer for archival recordings.
Note 2: K3 CONFIG: LIN OUT can be
Thanks, Joe, Lyle and Tim (KT1D). It was indeed the Playback Line In
control being un-muted. Now on to the next problem.
The tip to update the Router presets was especially valuable!
on 09 Mar 03 19:27 Joe Subich, W4TV said the following:
I suspect (but do not know) that it is the PC mixer
At the W1KM contesting site, we routinely see signals of +5 dBm or
louder on/near 40m from SWBC stations (using a single Yagi). We also
have two modest-power local AM stations (1 to 5 kW, a few miles away)
just below 1500 kHz that show up even a bit stronger than that on our
160m antennas.
Mechanical engineers refer to the turn of the screw method for
tightening. With a little practice one easily notices when the force
required to turn the screwdriver further begins to ramp up more
quickly. [This point is past finger tight, which often doesn't
compress the lockwasher very much
FYI --
I made a quick test of antenna port isolation on a K3 here to look
for a benchmark.
Main RX:
Signal injected at RX IN BNC connector of -98 dBm.
Pre-amp on.
160m 1820 kHz: When the main RX was switched to Ant1 or Ant 2, and
additional 64 dB of signal was needed to get
Hi everyone --
I got a number of emails from folks lacking cards. I will add them
to the work queue.
Unfortunately this week is not a good week to work on QSL cards. We
have an IRS filing due, and have to get a shipment to Germany (that is
overdue). It will probably be next week
A potentially related question / mis-understanding is the interaction
between width, shift, lo and hi. I'm not sure my concept is correct...
Firstly, people talk about 5 frequencies or ranges:
Fc = audio center of the passband
Fhi = -3 dB point above Fc
Flo = -3 dB point below Fc
I've looked at three 400 Hz filters to date and values do vary from
filter to filter; one of mine required 6 dB gain. Other 8-pole filter
bandwidths also vary a bit as well.
Just measure all the filters in the radio and true up the gains. Don't
need to worry about what the actually gain
The need to manually press the power button to turn on the radio is a
problem in remote-controlled stations. If power fails, one must visit
the site to power up the radios.
That said, there are often many transients when power is first restored.
An ideal solution would have these
In the world of ergonomics and man-machine interface design, there is
a rule: If an action will destroy information or a state than cannot
be restored with the same effort that it took to destroy, then the
system requires either (a) a Un-Do function of equal simplicity, or
(b) a
At the W1KM station we have had Anderson PowerPole connectors in
service for about 4 years. All were installed with the proper crimping
tool. The crimps were not soldered.
We are starting to see some increase in resistance on some of the
connections, and have speculated that some
Doug, Dan, et al --
On Ducie Island we had a 9.6 kbit/s dial-up Internet connection with
long latency. Actual throughput was substantially less than this. 1-2
kbit/s would be a good estimate.
We could have downloaded new firmware, if we felt it was critical to
do so. We did not feel
- in spite of all the noise
here, hee hee!
73 de dave
ab9ca
Eric Scace K3NA wrote:
Igor --
Your question about DSP is an interesting one.
In my limited understanding of the K3 signal path, there is always
a DSP operation on the signal for filtering. While noise blanking,
noise
Hi David --
Thanks for your interest in this arcane subject.
When a signal just a little bit above the trigger point for the
attenuation reflex appears, it takes about 150 ms before attenuation
develops. For a very strong signal, the reflex is faster (25-35 ms) but
there is still a
Privet Igor --
As best I can remember, we used MCU v1.66 and DSP 1.52.
I didn't use the AGC because I did not need it. The point of
automatic gain control is to adjust the gain of the various stages of
the receiver in order to
a) avoid distortion/overdriving a stage, and
b) bring
Igor --
Your question about DSP is an interesting one.
In my limited understanding of the K3 signal path, there is always a
DSP operation on the signal for filtering. While noise blanking, noise
reduction, and audio effects can all be switched off, I don't know if it
is possible to
Some reported hiccups with the radios should be put into perspective:
1. We ran 8 radios x 24 hours x 16+ days of operating: over 3,000 hours
on the air in total... plus additional hours for some units on board ship.
2. Some glitches were unique a specific radio, or at most two radios.
Hi --
The VP6DX Elecraft K3s were configured as follows:
• KPA3 100W option.
• KXV3 second receive antenna option.
• 2×KFL3A-250 250 Hz 8-pole roofing filter
• 2×KFL3A-400 400 Hz, 8-pole roofing filter
• 2×KFL3A-1.0K 1 kHz, 8-pole roofing filter
• 2×KFL3A-1.8K 1.8 kHz, 8-pole roofing filter
•
an awsome job!
Will there be any effort to load to LOTW those of us who are old
fashioned, and sent a QSL with donation (greater than $5) via mail? Just
wondering.
Thanks,
Orin N5ORT
K3 On order
On Fri, 07 Mar 2008 00:54:18 -0500 Eric Scace K3NA [EMAIL
Hi Geoff --
We used Heil HC-5 mic elements (the so-called full range element,
not the DX operation element). Mic gain and compression were both set
at 15.
A few operators were caught fidgeting with the mic/compression
settings, but we tried to discourage changes to these settings.
Hi Allan --
We do not send a LOTW entry unless a station asks for a QSL, using
the on-line QSL request form. In other words, the entire VP6DX log is
not being dumped into LOTW.
In recognition of the financial help provided by donors, LOTW entries
are being uploaded now for those who
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