Hi All,
I’ve have a suspect issue with low RX on 20m.
The level of background noise on 20m is substantially lower than other
bands, and in general the RX level on 20 seems down to other bands.
I’ve suspected this of being the case for a while but just noticed more over
this weekend in
Hi All,
I’ve answered my own question !! just tweaked C21 and C23 and now have more
‘oomph’ on 20m RX, with same power output !!.
Even though I’d tweaked these for max power output originally ??
Anyway, sorry for the bandwidth.
Regards
David
_
From: David Douglass
I did some measurements on the BFO output level on my K2 #2024.
On U11 pin 6, I measured LSB: 596mV RMS, USB: 727mV RMS, CW: 577mV RMS, using
the RF probe and a DVM.
There has always been some BFO leakage into the AGC circuit. When I
adjust the S-meter LOW for 1 led lit on LSB, two leds will lit
Matti,
Rather than the BFO leaking directly into the AGC circuit, there is a much
greater liklihood that the BFO signal is leaking into the IF amplifier, T7
or the IF crystals themselves, including the crystals on the KSB2 option.
Once the BFO finds its way into those circuits, it will be coupled
I have just finished building the 4 band filter board ( KFL1-4) for the K1. I
have 3 incorrect resistance checks that I cannot resolve. I'll do these one at
a time for clarity's sake.
The first is P1, pin 3 to pin 4. Desired reading is greater than 100k. I'm
getting zero. Any suggestions ?
Although I am not really a CW man I spent a few hours in the recent BERU
contest. After a while I began to get a bit 'fed up' with the raspy sidetone,
and looked at the reflector achieve for a solution. I saw that G3SJJ had
recently done a mod that involved adding a small board to hold the
Just finishing KPA100 assembly. All looks good up to the high power transmit
tests. I am setting the power control to 100 watts. Power indicator when I
transmit says I only have 21-25 watts out on all bands.
I am looking over the workmanship, guessing that maybe the final stage is not
working at
I am using a RigExpert SD and it works great. You will also have to use
W3FPR's fixed audio board for the audio out. The SD works very well with MixW
and many other programs, you will also have to have an 8 pin connector for your
mic and use the patch cable out of the SD into mic plug.
73's
One of questions frequently asked by those who have built my Z90
panadapter kit and use it with a K2 is what is that blip that I see
even with the antenna disconnected?
It is the BFO leaking backwards through the IF chain back to the
post-mixer amplifier output. From what I've learned from my
Certainly, a zero ohm reading is an indication that pin 4 or the circuit
trace or relay K1 pins 3 or 6 are shorted to ground somewhere. It could
also be on relay K2 depending on the state of the relays or could be caused
by a shorted crystal, or excess solder that wiched up onto the crystal lead
Tom,
How are you initiating transmit? If you are pressing the TUNE button, the
power level will be about 20 watts, you must press TUNE and DISPLAY to
transmit at the full requested output.
73,
Don W3FPR
-Original Message-
Just finishing KPA100 assembly. All looks good up to the high
Don,
Thanks for the quick response. I hope it is something this simple (stupid)! I
will go back and try again. I was reading the power and the SWR, so I thought
that should have been transmitting full power.
I did take the KPA100 apart and checked soldering, checked for possible shorts,
etc.
Yes, I did wonder about the K2DSP. Haven't got one here, yet! The mod
certainly makes a difference though.
Keep up the CW, Stewart!
73 Chris G3SJJ
Stewart Baker wrote:
Although I am not really a CW man I spent a few hours in the recent BERU
contest. After a while I began to get a bit 'fed
Don,
This is hilarious. When I use the proper TUNE sequence, it seems to work fine. I
guess if things don't look right, you should really re-read the instructions (or
don't work on your rig in the morning).
Guess I may be ready to go for the VA QSO party next week after all.
Back to final
Hi Pete:
I'm always the 'late' one to reply it seems...
The KNB2 is a very good blanker... on CERTAIN noise types... but, as
with virtually blankers, you DO have to have the right type of noise.
It's generally very good no line noise, sparkplug/elec. mixer/elec.
fencer noises as well.
If
Hello Chris and Stewart -
I carried out the mod to my K2 Revision A board way back in October
2000, following the instructions by WJ4P and still on the Elecraft web
site. I have to say that following these instructions I changed the
very raspy sidetone to a near sinewave matching my preferred
It's all about the source of the noise.
My KNB2 has made it possible for me to operate where I'd otherwise have
noise pegging the S-Meter.
The KNB2 removes repetitive high-amplitude pulse noise such as that produced
by automobile ignition systems, cheap lamp dimmers, etc., that cause a loud
I made (essentially) the same reply to this identical question when it
was posed awhile back.
The 4 concrete trucks and two large pickups were almost certain to
have had diesel engines and therefore would have had minimal ... if any
... electrical noise to be heard. Even the motors operating
Then you are fortunate enough not to be subject to power line noise at
your QTH. Here I've had continuing problems with power line noise (a
raspy buzz) and the K2 noise blanker is very effective indeed.
Bob NW8L
On 3/10/07, Rich McCabe (IWH) [EMAIL PROTECTED] wrote:
I have had two K2's fully
If you actually duplicate the AGC circuitry in the K2 for the S-meter would
probably be a simple move. S-meter readings are okay but I don't trust
reports from others because very few people have calibrated S-meters and
even if they are they become dependant on RF Gain Settings, Preamps and
While it is true these trucks were probably diesels and therefore there
was no IGNITION noise, it is certainly still possible for them to have
produced electrical noise. If nothing else, they have alternators. I'm
sure we've all heard alternator noise and I suspect the alternators on
these
True. And in modern equipment, high-current electrical motors are starting
to appear more often as alternator/battery technology improves. In general,
the number of electrically-powered equipment is on the rise.
One thing the KNB2 can handle nicely from a diesel engine is the
Darrell,
Certainly a meter could be devised to indicate the strength of the signals
making it through the IF filter - you have the correct points in mind - all
you have to do is tap in at the input of the IF amplifier and then amplify
the signal(s) and drive whatever circuits you want (even a
Thanks Don and Jack for the info,
Don,
I did ground Xtals X3 and X4 at the base (they where grounded on the top),
flush cut all leads on the mixer and if amp circuits. No change.
Both LSB and USB lit 1 led when I turn the K2 on, and then after abt 5
min, then on USB the second led will turn on,
In a message dated 3/11/07 12:24:04 PM Eastern Standard Time, [EMAIL PROTECTED]
writes:
Anyone have any ideas for an AGC independent S-meter?
Here's what I've used for 40+ years:
Ears
--
I have never really understood the fascination with AGC and S-meters in ham
radio for CW. For AM
Jeff wrote:
I built a K1 in 2004 and sold it. I'm thinking about building another
one, but the K1 I had did not go above about 7075 kHz on 40 meters.
I'd like the band coverage to be up to about 7120 kHz. As I recall,
the only way to do that is to replace a capacitor, I think it was, but
at
Circuitrywise, an AGC/AVC free S-meter is an oxymoron! Can't have one
without the other.
I pay little attention to the S meter on my K1. The old ear still one
of the best indicators anyway. Such things as a 199 signal is as possible
as having a 519 signal!
I guess it strokes the ego of a
Matti,
I do not believe there is any indication of a bad IC. The display is
digital, and if the level is somewhere above one bar, but not quite 2 bars,
there is an indecision point.
I would expect all the indications point to BFO leakage. As Jack pointed
out, all K2s have it, and some at a
Sorry I havent been on this forum but I finished the K2[SSB/DSP/NB]a couple
weeks ago and have been on the air. Fun Fun.. I'm finding it takes about 8
watts to bust thru the pile ups and get heard LOL.. But this is the sweetist rig
I've had the most fun putting together and working..Elecraft sure
It wouldn't seem to provide much advantage. The bandwidth of the
four-pole crystal IF filter may be adjusted in three steps from about 200 to
850 kHz. The selectivity as designed is outstanding.
Mike / KK5F
K1 #175 since 11/2000
I usually use an
On March 11, 2007 04:16 pm, Sandy W5TVW wrote:
Circuitrywise, an AGC/AVC free S-meter is an oxymoron! Can't have one
without the other.
Why not?
--
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada
___
Well, its been quite some time since I have posted to this list! I
just wanted to pass this along:
My equipment mod articles that were on the old ARCI web site are now
on my personal site: www.w1hue.us . One article might be of
particular interest to K2 owners: it describs a Peak Power
Sandy,
As far as I know, there is no direct relationship between the strength of a
signal and receiver AGC.
My AD8307 power meter can measure signal strengths directly off an antenna
if called upon to do that, it goes down to -80 dBm (about S-8) with no other
amplification. This is strictly a
Good Evening,
Whew! Things went well even if we do have to get up extra early
tomorrow! I think propagation was pretty good but others have different
perspectives :) While W3MC was quite strong to me he could not hear
either Tom or me. He got a relay from NK6A to Tom. I've mentioned
Nice work, Kevin. This is about how many Q's I had in all of EQP this
year :)
73,
Wayne
N6KR
On Mar 11, 2007, at 9:14 PM, Kevin Rock wrote:
Good Evening,
Whew! Things went well even if we do have to get up extra early
tomorrow!...
___
Hi,
while I haven't tried this, why not run a plug-in
cable from the rear audio jack to a DPDT switch in a
small box, or even a pill bottle, or similar. Then,
run a cable from one side of the switch to your
soundcard interface, and the other side to a speaker
or phones. You could also do this
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