David,
Your symptoms clearly indicate that you are suffering from 6m Bugitis, and I
regret to have to tell you that there is no known cure!
As you point out there is a lot going on on 6m, even during the lean times,
more than one would believe from reading the text books. Also don't be
fooled
David,
A Low Pass filter cutting off above 6m is useful here, because our not so
local FM BC station operates just above 100 MHz.
I suggest that if you do convert a LPF, do not use small toroidal inductors
(unless air wound) if the filter is to be used between a receiver and an
antenna
Hi David,
If of any interest to you I can send you off List some results of my most
recent two tone IMD tests on bandpass filters for use in a receiver's
front end, which would give you some idea of the effect of a core and its
size. These show each filter's 3rd order Output Intercept vs. core
Jim,
The thumping you hear during contests could be due to overload, especially
so if you have the IF noise blanker turned on.
The common problem with typical IF noise blankers is that they are hit by
*all* of the signals large and small that get through the wide bandpass
filters. If the sum
Larry,
Is there a Channel 2 TV station in your vicinity?
73,
Geoff
GM4ESD
Larry Godek wrote on Saturday, June 12, 2010 at 10:34 PM:
I've got some local noise around here that sounds like a water heater or
sorts or something along that line. Anyway it's really giving me fits on 6
meters. I
Don,
I do not like to add to your workload, but I would be interested to know if
the heat generated by the Mitsubishi power module has any negative effect on
the transverter's noise figure (receive mode) if you have the time to
measure it. If I understand the layout of the XV50 correctly, the
Don,
Thank you.
Yes it is the possible effect on the input L-C circuit that is my main
concern.
73,
Geoff
GM4ESD
Don Wilhelm wrote:
Geoff,
I do not have proper equipment to do a true noise figure measurement,
but my signal generator will go down to -140 dBm, and I can give the
number
Would that not depend on whether or not the source impedance presented to
the input device has been optimised for lowest noise figure or for optimum
power transfer? If the former then the question arises how rapidly does the
noise figure change with small deviations from an optimum noise match,
Vic,
I would suggest that you do not clamp each resistor between a couple of
pieces of aluminum, because some types of uncapsulated thick film power
resistors are quite fragile. They may not appear to break if stressed, but
there is the risk of creating a hairline fracture across the resistor
To add slightly to Joe's suggestion to use a SPDT relay as an alternative,
if a DPDT relay is used one pole can be used to switch the signal path, and
by connecting the second pole to ground the second pole can be used to
ground the unused signal path - which can improve isolation (reduce
Would you consider building a simple L-C filter consisting of a couple of
resonators?
This would help to reduce the potential high amplitude spurious responses
present on the high frequency side in the 8215 kHz to 15 kHz mixing process.
73,
Geoff
GM4ESD
From: Tom W8JI w...@w8ji.com
Sent:
If the TS-590 uses only two roofing filters and has the best receiver specs
out there, then I speculate that it could be using an H-Mode mixer, that
the roofers exhibit better than average in-passband and skirt IIP3 followed
by a decent strong IF, plus a LO whose phase noise is suitably low
No criticism of Elecraft nor the K3 was intended, besides I do not have any
good hard data as to the receive signal handling capability of the K3's DSP
sub-system.
What triggered my comment was that the TS-590 is said to use only two
roofing filters and it is claimed by the manufacturer that
Mike,
My K2/100 #3255 behaved in exactly the same way some years ago, actually on
two occasions about a year apart. The problem was caused by dirt or
corrosion on the contacts of the socket of the MCU U6 on the Control board.
Pulling and reseating the U6 IC cured the problem on each occasion.
Absolutely. I trust that the 40db maximum level you are suggesting is 40db
below test tone, not relative to pep.
73,
Geoff
GM4ESD
From: Paul Christensen w...@arrl.net
Sent: Thursday, May 06, 2010 11:06 AM
Agreed and that's the next opportunity for improvement. IM effects from
transmitters
Hi John,
Indeed it would.
The only and very small nit-pick I have about Perseus is that I wish that it
had more than the 4 markers available, at times I could use more markers
when using it as a Spectrum Analyser.
In case you have not seen it, the May 2010 issue of Radcom includes a review
From what I understand, the method used to remove birdies in the K3
although clever does not actually remove them, but moves them out of
hearing.
Before moving all of the Rx birdies using firmware, IMHO it would be wise to
take a *comprehensive* look at the transmitter spurs as well, because
Nidge,
Thanks for your reply.
Unfortunately I do not know enough about Hamradio Deluxe nor its interface
with the K2, but rightly or wrongly I assume that if the radio works
properly under computer control, then the MCU (U6) is working as it should
during this mode of control.
I cannot shake
Hi John,
There is a real risk IMHO that the Regulators, in Region 1 anyway, will act
and impose tighter requirements on Amateur Tx IMD levels ( and spurii) if
we hams do not win this battle - and push for *much* cleaner transmitters.
The Regulators by and large are not really concerned if we
Hello David,
Yes I did buy the Keyspan adapter in the UK in May 2007 from MacHeaven -
which is a trading name of Allstuff Limited, 1 Lodge Close, Bicester,
Oxfordshire OX26 3TE. At the time they had the Keyspan USA-19HS in stock.
Their Customer Service Queries email address according to the
Steve,
Another cause of intermittent raspy audio during both transmit and receive
could be a dicey solder joint in the KSB2's crystal filter circuit. If one
of the bandwidth settings you have chosen for the variable bandwidth crystal
filter is 1.8 kHz or wider, try switching to this filter
Hi Brett,
Certainly there are differences between RG58U and RG58A/U, but if the three
50ft lengths you have are quite old I would suggest that the best way to
decide which piece(s) to use would be to measure the insertion loss of each
50ft length at the frequency to be used, using a 50 +j0
A Keyspan USA-19HS converter has worked well withou fuss with both my
Toshiba Satellite and Toshiba Qosmio F20 Laptops.
73,
Geoff
GM4ESD
David Dunn wrote on Sunday, March 21, 2010 at 10:46 PM:
USB/Serial converters may work with most computers most of the time, but
I
have 4 different
Hi Gary,
What length of boom would be practical for you?
In Canada I used homebrewed yagis on 6m from 1956 onwards, singles and
stacked, which were not difficult to build, and if I still have the
construction detail for the 6 el yagis on 24ft booms I could send it to you,
if 24ft is not too
I agree with Bill's comments about Perseus, I bought one last year to use
primarily as a backup spectrum analyser. Not only is Perseus' performance
as a receiver good in all modes, but it also does a fine job as a spectrum
analyser and/or a panadapter, which would be useful to a SWL should
Hi Oleg,
One possible cause for the modulation you see could be a test tone harmonic
generated by your PC, or by the K2's audio circuits.
If, for example, your PC is generating a 1000 Hz test tone *and* a 2000 Hz
harmonic, then the output of the transmitter in SSB mode will be a carrier
The Cantenna was introduced sometime between late 1959 and 1961 if I
remember correctly, without the oil which had to be provided by the buyer.
Either 'Transformer' or 'Mineral' oil was used by most people who had bought
the Cantenna back then.
Geoff
GM4ESD
On Tuesday, March 02, 2010 at 9:49
Doug,
It has been said that climbing towers keeps the joints in good shape :-)
First licensed in 1946 when a young boy, callsign VQ8AK, Rx a TRF with regen
detector, Tx a 6L6 - 807, both homebrewed on breadboards borrowed from my
Mother ( I did ask her)!
73,
Geoff
GM4ESD
Doug Turnbull
Hi Bob,
Not a direct answer to your question about favourite programs, but you would
find the frequency and time information for English language broadcasts in
the World Radio TV Handbook It is not expensive and will provide you with,
and I quote, Comprehensive country-by-country listings of
Steve,
Did the Kenwood sales dude give any hint as to what would be better?
Software 'aint everything :-)
73,
Geoff
GM4ESD
S Sacco wrote on Sunday, February 14, 2010 at 7:45 PM
While at the Orlando Hamcation, I stopped by the Kenwood booth.
The sales dude mentioned that Kenwood would
Hello Juan,
Thanks for your e-mail. I will reply in full after I return home this
evening, off-list if my answer is long.
The symptoms, and the cures suggested, strongly suggest that it is a well
known type of IMD problem caused by the IF hardware - which includes the
roofing filter.
I
Hi Guy,
The problem reported has the classic characteristics of in-passband IMD
caused by a small dynamic range (IMDDR3) IF system, rather than being
something caused by the AGC sub-system. Yes changing the AGC's loop
characteristics will alter the effect, but the root cause is still
Hello Paul,
Do you hear any raspy sound when listening to quite strong CW sigs - not
the sound of real band or thermal noise, but more like the sound of paper
being torn?
I should not be asking as I do not own a K3, but curiousity is killing this
cat!
73,
Geoff
GM4ESD
paulb
Thanks Duane. The coupling between the pcb traces that run between W2 and J9
and between W3 and J10 are the main cause of filter blow-by in my K2/100
#3255. If I did not use my K2 in SSB mode, I would be tempted to cut them.
73,
Geoff
GM4ESD
dw bw...@fastmail.fm wrote on Wednesday, January
Ken,
A method that has worked well for me for several years is to use the
tracking number given me by the US supplier of the goods, and then follow
the progress of the shipment through UK Customs to Parcel Force's depot
which serves this area. When the shipment is reported as reaching our
Duane,
Can you remember the web-site of this K2 owner?
73,
Geoff.
GM4ESD
dw bw...@fastmail.fm wrote on Tuesday, January 19, 2010 at 5:50 PM:
Hi Gang,
I searched the archives but couldn't find anything on this question.
A few days ago I browsed into a web-site where a K2 owner
Randy,
It sounds as though this fellow is talking about the *In Passband* IMD
performance of a receiver, usually expressed in terms of 3rd Order Dynamic
Range when BOTH test signals are inside the receiver's passband. This
information can provide, for example, a useful indication of how a
On Thursday, January 14, 2010, at 4:53 PM, Guy Olinger K2AV
olin...@bellsouth.net wrote:
This is another one of those subjects that seems to have advanced on
rumor and inuendo. Actually measuring in-band IMD is not as simple as
it looks. Basically (whether included on a single chassis or
Martin,
If the frequency of the LO signal applied to a mixer is higher than that of
the incoming signal frequency, as is the case in the K3's receiver on all
bands except 6m, then a received LSB signal will appear as a USB signal at
the mixer's IF output. Also a received USB signal, for
David,
Wayne said: It's actually more like -144 dBm (500-Hz bandwidth). I assume
that this refers to a K144XV installed in a K3.
This equates to a noise figure of 3db.
To achieve a lower noise figure, the gain used in the K144XV would have to
be greater, which would further reduce the
I don't know about most either, but I, and our cat, built K2/100 # 3255
some years ago. Beware of cats who try to help, our Temple Cat takes an
unhealthy interest in multi pin SMDs.
73,
Geoff
GM4ESD
Conway Yee y...@bronze.lcs.mit.edu wrote:
Are most K2 users people who buy it prebuilt?
Wes Stewart, N7WS, wrote on Friday December 18, 2009 at 4:43 PM:
snip
We have DXpeditions operating on some chunk of coral that are running
wireless networks between stations and uploading their logbooks in near
real-time to the Internet via satellite yet their operators are still
Hello Clint,
While planning your antenna farm, have you considered using an antenna
modelling program such as EZNEC which could be of great help to you. A free
version comes with the ARRL Antenna Handbook.
Due to the effect of nearby objects such as above ground power lines, metal
gutters etc
Doug,
As Mel has suggested a laptop supply is an option, I used one to power my K2
in RX mode 24/7 over a period of almost 3 years during a propagation study.
The supply I used outputs 15V @ 500mA, so I used a LM317 regulator after the
supply to obtain the required output voltage for the K2
Hi John,
While I agree with much of your argument, there could be a price to pay in
the form of Equipment Type Approval.if further regulations were imposed on
the Amateur Service. Without doubt Type Approval would increase the selling
price of the black boxes, and put an end to the use of
Windy,
What sort of arrangement are you using to connect the feeder to the antenna?
Do you get a lot of wind-blown dust / sand during the dry weather, some of
which might be staying on the feeder until most is washed off by rain.
73,
Geoff
GM4ESD
Windy KM5Q wrote on Thursday, October 22,
Dale, I suspect that in Windy's case moisture could be entering via tiny
holes drilled in the dielectric by windblown sand or dust. Unfortunately I
cannot offer any practical solution to prevent this happening, because I do
not use window line.
4 wire open wire feeder behaves like a lovesick
Dave,
Before I list a couple of home truths, may I say that I agree with your
comment.
1)
The IMDDR3 data from ARRL and others is a report of the receiver's IMDDR3
performance, not that of the filter's IMDDR3 performance. The data does
provide some indication that the IMDDR3 performance of
Ah but, under noisy band conditions the bandwidth of the listening receiver
is most probably set to some value much less than 2.4 kHz. So I would
question whether a wider filter in the transmitter does in fact result in
improved intelligibility under these conditions.
FWIW I find that a 2.1
Hello Dick,
I am not a DSP expert either, but a tracking filter keying an audio
oscillator will do exactly what you want. In its simplest form a tracking
filter is a phase locked loop, and ICs which can be used at audio for this
purpose have been available since the 1960s and are inexpensive.
Wayne Burdick wrote:
The K2 is a very mature product, and I don't anticipate adding further
internal modules to it.
Hi Wayne,
Assuming that you had nothing else to do (!!), a Mk II version of the K2
using a different and higher IF than the presently used 4.914 MHz IF might
be worth
Back in 1946 -1948 ish, C for yes, and R or EN for Received and
understood was used on the amateur bands. The same practice was used by my
school's cadet signal corps and the army in South Africa during and after
WWII.
73,
Geoff
GM4ESD
- Original Message -
From: David Cutter
Toni,
Do I understand correctly that the transmitter spur is always about 7 kHz
away from your actual frequency, regardless of what your actual frequency
might be? Or does the spacing change when you change the actual frequency by
say 10 kHz?
73,
Geoff
GM4ESD
Toni Lindén wrote:
Hi!
I
Thom,
A PSU rated for 25 amps should be adequate in terms of current for a 100
watt transmitter. Something else that must be considered, especially if SSB
is used, is that the PSU's output voltage should remain constant at all
transmitter power levels. Also the DC supply voltage measured at
Ueli,
My K2/100 #3255 has frozen on two occasions.
Try removing the MCU (U6) on the Control Board from its socket, and then
plug it back into its socket. Doing this should clean the connections
between the IC and its socket, and should defrost your K2 if that is the
source of the problem..
From Guy Olinger K2AV
Sunday, September 06, 2009 3:24 AM
In general are you talking about CW or SSB or both? If SSB, I find
that the controlling aspect of close signals is transmitted splatter,
which no receiver can do anything to improve. Some really poor front
ends make that worse.
Hi
Hi Craig,
The spacing of the two test signals used to determine a receiver's 3rd Order
Dynamic Range (IMMDR3) should include tests with both test signals inside
the receiver's *overall* passband, which in the case of receivers designed
for amateur use would provide us with some measure of
Hello Hisashi,
Yes, I have a KAF2 and hear a tick every second when the time is
displayed, so I don't use this feature.
The tick could probably be eliminated, but I have not taken time out to
look at the problem.
73,
Geoff
GM4ESD
Hisashi T Fujinaka wrote on Sunday, August 23, 2009 12:47 AM
Lance Collister, W7GJ, wrote:
I am looking ahead to the next F2 cycle on 6m, when it will be helpful to
have dozens (actually over a hundred) different memories stored to be able
to watch
for propagation indicators below 50 MHz.
The problem IMHO with having a receiver hop channels to watch
From: Jim Hester sent Monday, August 17, 2009 8:19 PM
To overcome the issue of a featherweight P3 Elecraft could provide an
internal 1 kw dummy load.
Then perhaps the P3 could display a spectrum of the transmitted signal, with
a couple of gear changes when transmitting.
73,
Geoff
GM4ESD
Jim,
If you have a *long* length of old 50 ohm coax hiding somewhere, it might be
useful as a dummy load at some frequencies if its loss is high enough, but
make sure that its centre conductor and braid are not shorted.
IMHO a good dummy load is worth buying or building.
73,
Geoff
GM4ESD
A noise gate placed in the signal path can be a source of IMD products, even
when it is not active.
IMHO a separate noise receiver which can be tuned over a limited frequency
range above the band in use to avoid real signals, whose output inhibits
LO drive when noise is present, plus the
Not always. Even if the Op who answers your call can copy high speed CW, he
might be replying at slow speed for some good reason such as echo on your
signal, which can make copy of high speed CW difficult, hoping that you will
slow down. At this latitude 56N multipath echo occurs quite
David,
My Perseus SDR has both SAM and DRM capability, but I have not tried ( keep
forgeting) to listen to a station using DRM. Its SAM works well.
If of any use to you, I can try the DRM feature when my Perseus is not tied
up doing something else, and report back later.
73,
Geoff
GM4ESD
Vic Rosenthal wrote on Thursday, July 23, 2009 at 7:14 AM:
I too admit that I've watched all of these LPPans go by at attractive
prices because --
much as I want a panoramic display -- I am waiting for the Elecraft
product. And I also
hope it will be a standalone device that does not
Good morning Jim,
Thanks for your e-mail. I also use tall trees to support antenna catenarys,
which are made from 6mm dia woven marine rope, along with marine pulleys,
and a counterweight at one end of each catenary. The counterweight for each
catenarys is fused, so if another tall tree falls
You mean his book of spells and black cat?
Geoff
GM4ESD
On Tuesday, July 21, 2009 at 6:00 PM, Stewart Baker wrote:
I hope that he took his laptop with the K3 development software installed
:-))
On Tue, 21 Jul 2009 09:29:18 -0700, Mike Scott wrote:
Wayne went on a 3-week vacation :)
No
Joe,
Forgetting about RF performance for a moment, wouldn't the weight of RG-8/
RG-213 create a problem unless the antenna is supported at its feedpoint ?
If it is not supported, Don could end up with an inverted inverted V, aka a
Droopy Dipole.
BTW I do not use the plastic window/ ladder
Vic K2VCO wrote:
Possibly the noise is picked up differently by the antennas...I'm not
sure, but when
diversity is on, the signal seems to stand out, less damaged by the noise.
Far fewer
letters get crunched -- it makes it much easier to copy.
Space Diversity can work wonders on 6m and 4m
Rick,
A long wire antenna can be fed at any point along its length, not only at
one end, but at any given frequency the antenna's pattern will change as
will the antenna's feedpoint impedance as the position of the feedpoint is
changed. Some schemes such as the Off Centre Fed wire place the
On Sunday, July 05, 2009 at 3:54 PM, Wes Stewartn...@yahoo.com wrote:
It seems to me that since audio is the desired output, the design process
should be to design an excellent audio system first and then work back
toward the antenna. Regrettably, it seems this is the
It is with some reluctance that I write this Howard, but because I do not
own a K3, I thought that you might be interested in an opinion that cannot
be thought of being biased in response to some of your comments, which I
respect.
As someone who has been involved with the hardware design of
Allan,
If the KRX3's bandpass filter for 30m has been aligned properly, one thing
worth checking is that the 8.215 MHz trap ahead of the bandpass filters is
aligned properly.
From looking at the schematic of the trap, it is likely that the top of the
trap's response is not very narrow in terms
Mike,
The method that I use to clear holes in pcbs that are filled with solder is
similar to pushing a heated wire through the hole, but I use a sewing needle
instead because solder will not stick to a needle. As you did with with the
wire, keep heating the needle with an iron while pushing it
On Thursday, July 02, 2009 5:22 at AM, Bill Coleman wrote:
On Jul 1, 2009, at 8:31 AM, Geoffrey Mackenzie-Kennedy wrote:
Yes some years ago, after a falling pine brought down the antenna in use
while the K2/100 was transmitting (CW). Diodes D12 and D14 in the
KPA100's
T-R switch both failed
Has anyone seen the K2 act like this before?
Yes some years ago, after a falling pine brought down the antenna in use
while the K2/100 was transmitting (CW). Diodes D12 and D14 in the KPA100's
T-R switch both failed into a shorted condition, and one of the diodes in
the K2's T-R switch
.075 in dia black Kevlar string rated at 400 lbs strain IIRC is almost
invisible, and is UV resistant, although the colour does change to grey
after a few years outside.
73,
Geoff
GM4ESD
- Original Message -
From: Mike Harris mike.har...@horizon.co.fk
To: Fred Atchley
Doug,
From a European perspective, and this is a personal opinion, while the 3rd
Order dynamic range performance at 2kHz is certainly very important, it is
the Spurious Free 3rd Order dynamic range at spacings less than the IF
bandwidth that really matters, i.e. both test signals INSIDE the IF
Toby dj7...@muenchen-mail.de wrote:
You are, I think, referring to
http://www.xs4all.nl/~martein/pa3ake/hmode/ and the work done by
CDG2000 group. Imho, Martein's site is really worth reading.
Hi Toby,
Yes, followed by a large spurious free IMDDR3 IF system whose noise figure
is 2db.
73,
Hi Lyle,
You might try adding an attenuator between the K3 IF out and the LP-PAN
IF in and see if the overloading disappears. If so, it might indicate
the LP-PAN system is overloading rather than the K3.
73,
Lyle KK7P
PS - The K3 blocking dynamic range is 20 to 30 dB better than PC-based
Yes indeed as both you and Joe, W4TV, have suggested before. Nickel plated
coax connectors can create similar problems.
Geoff
GM4ESD
David G3UNA wrote on Tuesday, June 16, 2009 at 3:19 PM
And the rogue mixer could be our old friends Rusty Bolt, Anode and
Cathode.
David
G3UNA
Of
Steve,
Although a long shot, among the possible causes of your problem is a
defective roofing filter, defective in terms of signal handling capability
but otherwise OK.
To eliminate this possibility, have you tried switching roofing filters with
the LP-Pan disconnected?
73,
Geoff
GM4ESD
It is Friday :-)
If the receive and transmit modes can each be selected separately using a
front panel control, likewise the transmit frequency offset when required,
it can be done using just one VFO. This leaves the second VFO available for
other purposes such as monitoring another station on
Ron D'Eau Claire wrote:
An orderly shutdown requires the POWER button be pressed on the K3 before
the power supply is shut down.
---
Ron,
Is there any interface available on the K3 which would allow an external
automatic protective shutdown
the POWER ON signal can I shut down the 13.8V supply?
73
--
Joe KB8AP
On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:
Is there any interface available on the K3 which would allow an external
automatic protective shutdown system to meet this requirement, rather
than
Hello Dave,
I hope that your warning about the effect that a magnet can have on cores
will be noted by those who use magnetized screwdrivers to recover hardware.
To recover parts that have gone AWOL I would srongly recommend the use of an
inexpensive Grabber tool, which can also be used to
Brett,
If you have not built anything yet using SMDs, I believe that you will
probably be converted to using SMDs after you have. Just be very careful
to keep chip capacitors of the same value separated from others before using
them, because the cap.value is usually not marked on the chip.
I
Be warned Vic, you might become addicted to working long haul DX on 6m!
73,
Geoff
GM4ESD (Seduced by 6m in 1956)
Vic K2VCO v...@rakefet.com wrote on Saturday, May 09, 2009 11:14 PM
I have a K3, an HF beam which shows a 2.5:1 SWR on 6 (tunable to 1:1, of
course) and I've
never had a 6 meter
Hi Mike,
There is a penalty to be paid if diodes are used to clamp the level of
strong signals in a receiver's signal path, and that is the generation of
intermodulation products. In a no-split pile-up situation where two or
more closely spaced strong signals from other callers are in the
Hi Paul,
How well your idea performs in practice would, I suggest, depend on the
strength of the wanted and unwanted signals of course, but also on the *in
passband* and skirt region IMD behaviour of the roofer(s), and all 'stages'
that follow vs.applied AGC. Any IMD 'weakness' in this area
Stewart,
To remove dust and dead beasties from circuit boards, I use the type of
vacuum cleaner that you describe powered by DC, which I was lucky to be able
to buy at low cost in Luxembourg many years ago. To clean other parts of my
equipment I use the vacuum cleaner and a 'make-up' brush
Hello Mike,
Here I use a Heil ProSet Plus headset which has the HC-4 and HC-5 mike
elements, although I do not use the HC-4 DX element with my K2/100 #3255
which does not contain any of the official mods. I do not use any external
mic preamp with this K2/100 because one is not required,
John,
If the voltage rating of these relay coil bypass caps is somehow being
exceeded in your shipboard installation causing the caps to fail, and if you
cannot find suitable higher DC voltage rated leaded replacements, you might
like to consider using SMD (chip) capacitors instead.
AVX
Walter,
For many years I have used a Weller TC 3001 iron (temperature control) with
various types of tip, and its WTCP 51 power supply, and I have not found a
temperature calibration unit to be necessary. This iron has been and is used
a lot while building homebrew equipment, most using SMD
Our Temple Cat likes SMD parts, but only those types that have lots of legs.
She's not interested in inexpensive SMD capacitors/ resistors, leaves those
for the dogs.
73,
Geoff
GM4ESD
Jon Perelstein wrote:
How embarrassing is this?
As I was working on the KPA100 last night, the EL5146CN
Phil,
If your 75A3 does not hear anything on 20m, but your watt meter shows 100
watts, suggests that your K3 when it is supposed to be transmitting on 20m
is generating RF in some other part of the spectrum, hopefully not a
parasitic. Does the K3's transmitter work as it should on all of the
Apart from 75m and 20m, does the external watt meter indicate any output
when on the other bands?
Geoff
GM4ESD
- Original Message -
From: Phil LaMarche plama...@verizon.net
To: 'Geoffrey Mackenzie-Kennedy' gm4...@btinternet.com
Sent: Sunday, March 22, 2009 3:02 PM
Subject: RE
Steve,
I agree. Smells like feedback rather than a parasite.
73,
Geoff
GM4ESD
- Original Message -
From: Steve Ellington n...@carolina.rr.com
To: Geoffrey Mackenzie-Kennedy gm4...@btinternet.com; Elecraft
Discussion List elecraft@mailman.qth.net
Sent: Sunday, March 22, 2009 3:29 PM
Sorry for an off-topic question. Does anyone have any information about the
dry vs wet characteristics of 450 ohm ladder line? I have never used this
type of line, but I might have to use it for mechanical reasons to feed
another antenna now being built. I am told that its characteristics
Many thanks for all the comments about wet 450 ohm ladder line.
There is no doubt in my mind about open wire line being the better choice,
and I would normally use it. But in this particular application there is the
risk of open wire line being damaged by or ensnarled in a fairly dense
growth
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