Vic,
Having blown up my share of probe diodes, I find it useful to stick a label
on any such homemade probe noting its maximum safe peak working voltage
derived from the diode's PIV rating.
73,
Geoff
GM4ESD
- Original Message -
From: Vic K2VCO [EMAIL PROTECTED]
To: [EMAIL
My suggestion is that the BNC connector on the K2 should be left untouched,
and if the antenna feeder uses RG-213 or similar an 'adapter' made from a
length of RG-58 coax with a BNC male at one end and a N connector at the
other end should be used. Two reasons for this (1) The RG-58 'adapter'
Martin VA3SIE wrote:
I placed a scanner across the room (with a 2m rubber duck antenna)
from the KX1 driving a magnetic loop antenna tuned to 7040kHz and
transmitted on 7040kHz. The scanner showed full scale deflection. I
then tuned the scanner to the 1st harmonic 14080kHz and the scanner
'S'
Chris, K6DBG wrote:
But winter is coming and I want to feed the signals inside. I have a nice
steel box and DPDT knife switch to act as ground disconnect. I bought
some electric fence spark gaps to provide some lightning protection.
I was planning to 1M 1/2W resistors across the gaps as a bleed
Bob, VE3XM wrote:
Take it from a SSB op go for the 2.4 SSB caps, I believe 2.6 Kcs. is too
wide for effective SSB reception.
Mine are 2.4 Kcs.
---
May I second Bob's comment. My KSB2 filter is roughly 2.2 kcs which I find
quite wide
Don W3FPR wrote:
snip
I always have bad feelings about attempts to use ALC as a power output
limit - expecially on SSB because it only leads to distortion. It is a
form
of compression, but audio compression is much better at increasing the
average power of a signal. One could design a
On Friday, November 03, 2006 at 3:27 PM, David M0DHO wrote:
snip
.I have yet to see a detailed description how BOTH of these control loops
work, so if anyone has any more details on this, I'd appreciate the wisdom
being shared :-)
---
Don,
Thank you for putting me straight on this. On the control loop question I
agree with David, M0DHO, that an explanation of the workings of the ALC
system would be useful not only in its dynamic state but also in its static
state.
73,
Geoff
GM4ESD
- Original Message -
Geoff,
Ron AC7AC wrote:
That info has never been confirmed as far as I know and they've been around
for half a century according to some reports.
Of course, the simple explanation is probably the right explanation: a
propagation beacon that tells various stations which frequencies to use at a
given
Have you any thoughts about what might be causing Don's K2/100 to behave
when he switches the display from RF to ALC? I can see how the ALC might
'hunt' on SSB, but switching the display should not make any difference to
ALC action I would have thought.
73,
Geoff
GM4ESD
- Original
Ron AC7AC wrote:
There were some mods that changed the gain distribution within the K2 RF and
audio paths that some suggested could increase the IMD. I suspect that's
where the comments about not doing them on a KPA100 came from, although it's
hard to see how an S-9 signal running 5 watts is
Don, W3FPR wrote
No longer will I use commonly available RTV direcly in electronics
applications - even the consumer grade 'non-corrosive' RTV commonly
available that I bought recently had a vinegar smell to it.
--
Very wise!
73,
Jeff WB5GWB wrote:
Does anyone know how directional these small loops are? I believe they're
bi-directional, but I wonder how deep the side nulls are. I wonder how
well
one would work as a receive-only antenna for nulling QRM or QRN coming
from
a particular direction?
So I had better own up to working SSB most of the time :)
73,
Geoff
GM4ESD
- Original Message -
From: Kurt Cramer [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Tuesday, October 17, 2006 2:27 AM
Subject: [Elecraft] Slow AGC
For the two of us on this list that operate SSB most
Ron, AC7AC wrote:
That's the difference between one who tinkers and an engineer G.
---
I had never thought that there was any difference. 'Develop' is a posh word
for 'Tinker' is it not? g
An AGC controlled IF which provides
True, it is also much easier to weatherproof N connectors than 'UHF'
connectors when used outside.
73,
Geoff
GM4ESD.
John R. Lonigro wrote:
Actually, that's the main reason Type N's are better for VHF/UHF. There's
no impedance bump in the feedline at the joints. Not true for PL259's.
Bill W1PA wrote:
After a few months of relative inactivity, I went back last night to
continue building my KPA100,
and had the K2 on in the background. I actually thought it was a DSP
artifact, but it's there even with the DSP in bypass.
Tuning through a quiet band, I noticed as I tuned
Steve, VK2SJA wrote:
I've done some web surfing re this issue and it appears that for EMI
testing they use a wide band RF pickup of some sort and a sprectrum
analyzer. Given that I don't have a spectrum analyzer and that I'm not
concerned with laboratory accuracy is there a simple way of
Ron, AC7AC wrote:
I did get some good results only using an accurate return loss bridge that
can measure SWR to a degree common meters can't approach.
Perhaps an antenna analyzer also would provide that sort of accuracy.
-
FWIW my MFJ
Hi Bryan,
Your approach as you say solves a lot of problems. I use someting similar
here using antennas each matched to 50 ohms, but a remote ATU would be a
better approach and would certainly add to a multiband capability. From a
remote coax multi-position antenna select switch, the main
Perhaps Elecraft might like to consider adding an 'old fashioned' type of
balanced antenna tuner to their product range, with a balun at the
transmitter connection, to make it easier to match some types of antenna
system to the transmitter? One that could be used outside and be remotely
Doc,
I was thinking of the link coupled parallel or series tuned type of coupler
which was at one time known as an Antenna Matching Unit before the name
Antenna Tuner became the norm. The Johnson Matchbox was an example, and such
'tuners' can convert a considerable range of impedances as
Evening Kevin,
A step attenuator capable of adding up to140db or so of loss is certainly
very useful when working with receivers, but would be quite expensive I
believe. If two step attenuators were used in cascade they would have to be
built and connected in such a way that ensures that the
MiniCircuits had a VK-land Representative, Clarke Severn Electronics -
Hornsby - NSW - Australia 2077 [EMAIL PROTECTED] tel 61 29482 1944,
but I do not know if they hold any stock.
73,
Geoff
GM4ESD
- Original Message -
From: Jack Smith [EMAIL PROTECTED]
To: Geoffrey Mackenzie
Vic, K2VCO wrote:
All noise blankers that I've used cause some degradation of the receiver's
dynamic range performance. This means that in a strong signal environment
(like in a contest) you will hear spurious responses when it is on. This is
of course a matter of degree, and I know there
Jeff [EMAIL PROTECTED] wrote:
Hi gang,
Now that we're at the bottom of the solar cycle, I'd like to be able to
run more than five watts on occasion, but not at the expense of putting my
final PA at risk. What is the highest level of RF output power that a K2,
QRP version, can run on CW
Stephen W. Kercel AA4AK wrote:
I have a strange problem with my K2/100 on 80 meters.
The situation is as follows:
I work QRP DX at the low end of 80 M, (say 3508 kHz or thereabouts) with a
requested power of 4.5 watts, and get an indicated 5 watts out.
I then check into the Pine Tree Net
Sorry about using bandwidth, 'Spamcop' at it AGAIN.
73,
Geoff
GM4ESD
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Karl Larsen [EMAIL PROTECTED] wrote:
Hi Geoff, cut your weeds and we can both think hard on what Speech
Compression really is. I got to thinking and about all it can be is
clipping of the high voice peaks, and increasing audio drive. I will look
at the ARRL Hand Book and see what they
Bill NY9H [EMAIL PROTECTED] wrote:
I too would be interested to see how much additional distortionless
average amplitude could be generated beyond the AD chip.
FWIW my guess is that if audio compression and true clipping is to be
Henry, [EMAIL PROTECTED] , wrote:
Has anyone tried any of the DF4ZS RF speech processors
(http://jwm.de/afu/index0.htm) with a K2 yet?
For those who think the SSB punch is a little weak, maybe this would
help.
In fact, maybe this would be a good Mini-Module Kit.
On September 07, 2006 3:00 AM, Darrell VA7TO wrote
I too see the occasional High Current reading at the beginning of a
transmission. Switching to the Voltage/Current display shows current
well
under the current limit setting.
Looks like I am currently having problems with RF getting into my
- Original Message -
Hummm...just wondering...do you guys over in GB and Europe have those
little warning tags on your mattresses?
Mike N0MF
--
Little ones and big ones - choose a subject, not solder.
73,
Geoff
GM4ESD
Don W3FPR wrote
Gerald,
That certainly sounds like it might be hard to isolate.
I may be wrong, but from the behavior it sounds like you have a relay with
points that are not making good contact - when you put a bit of RF through
it, it becomes OK for a while. Please be aware that this is
Karl Larsen [EMAIL PROTECTED] wrote:
Yes. The LO has to beefed up from 400 mV into 2k-ohms to something else
yet to be determined since the LO has to switch the FETs on and off. The
space problem is caused by the transformer, and the gain problem is due to
the H-mode having a loss of gain
Tom N0SS wrote:
Folks:
Just received a query from a friend, asking how to VISUALLY identify a
NPO/C0G ceramic capacitor if it's in your junkbox.
I've heard that NPOs should have a colored band along their top edge, but
I've not been able to confirm this via any published info, of from
Ron, AC7AC, wrote:
An interesting idea for noise blanking, Geoff: turning the L.O. on and off.
But keying an oscillator like that always produces sidebands around the
oscillator frequency. That has its own issues when that oscillator is used
as an L.O.
I wasn't aware of any dynamic range issues
Wayne Burdick [EMAIL PROTECTED] wrote:
There are potential issues with using any type of mixer besides the
present SA612 in the KX1.
First is PCB space. The present mixer, which requires nearly no additional
parts, barely fits. I seriously doubt that there would be enough room for
any type
- Original Message -
Karl Larsen [EMAIL PROTECTED] wrote:
snip
The TI chip uses 5 volts at 18 mA in a Mixer configuration. I need to
study all the information I have now on my computer and then write up an
actual proposed receiver mixer for the KX1 that will knock out nearly
Karl Larsen wrote:
There are new chips that run with a 100 MHz clock.
And things seem to be getting better. The Analog Devices AD9951 can I
understand be clocked at up to 400MHz, and I hear whispers about higher
clock frequencies.
The relatively high 4.9 MHz IF of the single conversion
Colin,
My K2 #3255 shut down one day when about 2-1/2 years old leaving the display
showing the frequency last used, but none of the front panel controls
functioning except the power ON-OFF switch. After an overnight rest all was
well. Eventually I found the problem to be caused by the socket
Ken Kopp K0PP wrote:
A couple of things to keep in mind ... RF flows on/near the surface of a
conductor, and the correct
length of an antenna made from insulated wire will
be slightly different than the formula-calculated length.
-
There are some many practical problems with the holder capacitance,
stray capacitance and the like that would make such a filter challenging,
even if someone were to deliver a box of 45 MHz crystals with measured Qs
of 2 million to my doorstep. And if the box of crystals arrive, to obtain
Jack Smith wrote:
Hence, the resonator Q requirements for a 5 KHz filter at 40 MHz are not
grossly different than for a 500 Hz filter at 4 MHz, which is quite
achievable. But for a 400 Hz filter at 45 MHz, the required resonator Q's
get into the million range.
Jim,
I omitted to add this thought in my e-mail to you.
There is an alternative to the usual type of single down conversion and
double (up - down) conversion receiver, which is a single up-conversion
receiver using a lowish VHF IF and detector. The benefits of up-conversion
are then
Paul, as Vin suggests I also use a system of marine pulleys to avoid
problems when the trees sway. I would like to add that because most trees
tend to grow over any object such as a rope that is hanging over a limb, it
is worthwhile to loosen up occasionally the ropes that go over the trees to
On Wednesday, August 09, 2006 at 7:18 AM Wayne Burdick wrote:
A much better approach to the Filter Shifing problem would be to
actually *narrow* the first crystal filter, protecting all subsequent
stages.
---
May I second
Ron AC7AC wrote:
Others pointed out the reason - single conversion design. That
single-conversion design is also what helps the K2's performance excel
compared to those with multiple-conversions that allow for an IF Shift
knob. Frequency conversions in receivers are like making copies in
Jim,
Have just been able to get to read your e-mail. Will answer in full later
today - 02:50 am at the moment - probably direct to avoid using Discussion
List bandwidth.
73,
Geoff
GM4ESD
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED] ;
Karl Larsen wrote:
Yes that is fun and 40 meters is where you will find activity at night
if the noise is low enough. But this is not as good as it will get when
conditions improve. And they will. Then you will work DX with a 6 foot
mobile antenna QRP.
Keith KD1E wrote:
Well, I don't know enough to discuss this but it sure seems to me that
someone could come up with an R-4B style design using modern parts that
would be easy to build and pretty cheap. Well, you'd think it would be
at least. After all that rig was nothing more than a receiver
Dave Walker wrote:
I notice when I listen to my CW on a separate reciever that there appears
to be a slight husky modulation to the carrier. It's not located near a
power supply - so I've eliminated magnetic field interference. I do have a
manual MFJ tuner located 3 ft away. My antenna is
Ragchewed with John 5Z4JX (N6JW) who is using a K2/100, on July 20 15m SSB.
73,
Geoff
GM4ESD
Gil NN4CW wrote:
Elecraft products seem to have a worldwide following.
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You must be a
Hi Tony,
Although I have not worked EME but only listened to signals reflected by the
moon, since the late 1950s I have been involved in weak signal work on 6m -
including a project (from Canada) in the late '60s to work crossband 6m / 4m
across the Atlantic. From this, if I was going to use
Alex NS6Y wrote:
In my reading about green radios I can't afford (but want anyway) and in
various readings I've heard that detecting the 455-kHz LO of a superhet
isn't all that hard, and that for instance in countries that require a
radio license, they use such techniques to check if
John,
The type of IC socket supplied with the K2 can cause problems after a while
even in a house environment. A couple of years ago I had to change the
Control Board's MCU socket in my K2 to a turned pin / machined pin type
after the K2 shut down a couple of times. I have ALWAYS used the
Kevin KD5ONS (Op 1st Class) wrote:
I would like to wish our country Happy Birthday. We've pushed and prodded
our poor Constitution but it still is a proud document. Another two
hundred years would be a nice gift to the folks who founded our nation so
long ago.
Happy Birthday to the home
Jay W6CJ/AAR9QM wrote:
What are the transmit/receive limits of the K2- is it ham bands only?
Thanks,
Jay
W6CJ/AAR9QM
---
Jay,
My K2/100 #3255 can transmit / receive outside of the ham bands. I have not
checked the limits.
73,
Geoff.
By using a well shielded dummy load for the Tx!
73,
Geoff
GM4ESD
- Original Message -
From: Nick Waterman [EMAIL PROTECTED]
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Tuesday, July 04, 2006 9:22 PM
Subject: Re: [Elecraft] K2 Bands?
Geoffrey Mackenzie-Kennedy wrote
Hi Dave,
Some manufacturers do supply NPO and COG capacitors that are blue
resin-dipped. I have seen other colours but blue seems to be the favourite.
The small blue capacitors that Elecraft supplied for my K2 #3255 RF board
are NPO types, which would be required in the tuned circuits of the
Julius N2WN wrote:
I'm looking to modify a MFJ-1025 (ala W8JI) and need
to build a couple bandpass filters. My first thought
is to steal the filter from the 160M Elecraft board,
heck it works great. I do not have the parts for that
on hand. I do have the parts for the filter in the
KPA.
Other
David,
In addition to Vic's and Pete's suggestions, take a close look at the plate
choke for any signs of localized heating, ancient or modern.
I'm flying blind without the schematic and am assuming that the amp has a pi
output network with a RFC at the high Z end for DC feed.
73,
Geoff
On Thursday, June 22, 2006 1:50 AM, Ian Stirling wrote:
If I see thunderstorms predicted, or I predict a
local one myself, I will disconnect all my equipment.
During a thunderstorm, which your third statement
suggests, I will never do. I'd rather my radios
fry than me.
Alex NS6Y wrote:
And #2, how well do audio filters, or even audio DSP like SGC sells, for
narrowing things down for listening to CW?
--
IF, and that can be a big IF sometimes, all the signals getting through the
2.5kHz IF
Don W3FPR wrote:
Yes there is one 'tool' that is assumed for the alignment steps, and that
is
a dummy load. Every hamshack should have one. If you don't have one
already, I suggest the Elecraft DL1.
-
Also very useful
Tom WB2QDG wrote:
Yes the basic K2 with the ATU also has 2 antenna jacks. I also put a
dummy load on 'Ant 2', I can't tell you how many times I tried to auto
tune into an empty 'Ant 2', before I finally caught on.
---
Hi Tom,
I
Vicd Rosenthal wrote:
I'm thinking about duplicating the KPA100 LP filter section so I can use
this amp as an output stage for another rig. This sounds like a
no-brainer, but I wonder if there's any reason not to do this?
Also, does anyone know the manufacturer and model number of the
When I lived in Luxembourg I found a solid plastic cased thing that has two
banana plugs which mate with a DMM and a BNC jack. With a BNC male connector
suitable for a probe's RG-174 cable it is easy to change probes without
moving banana plugs, and soldering to banana plugs is not an issue.
Congratulations John. Worthwhile keeping an eye on 10m for South Americans
in amongst the European Es, a PY is CQing away on 28.4896 MHz SSB as I type
this at 19:54Z.
73,
Geoff
GM4ESD
- Original Message -
From: John GM4SLV [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent:
Ron AC7AC wrote:
There are two issues with ground-mounted verticals - either one that is
actually 1/4 wave long or one that uses traps to 'disconnect' the unneeded
length on the higher bands.
1) On the higher bands, the active portion of the antenna is that part
closest to the ground. So, on
Don,
You are quite right about how easy it is to put up a Half Square, and it is
quite a forgiving antenna as far as dimensions are concerned, although
symmetry seems to be important. When they were up I fed each of my 40m Half
Squares at its corner using the outside braid of the feeder as
Back in 2003 my K2/100 plus options came in under Commodity Code 8525 2099
00, Electronic Kits, which attracted 0% duty, although UK Customs did
manage to add £10 under 'Other Government Charges'. No doubt Customs and
Excise have since changed the Code as part of a 'make work add confusion'
Bill KA3IXF wrote on Sunday, June 11, 2006 2:00 PM
Not sure if you can apply this to your application, but I designed the
KA3IXF Apartment Antenna, which will be appearing in a upcoming QST Article
within the next couple of months. The folks at MFJ and B/W are also
looking at it for possible
Wayne wrote:
I'm in the market for new QSL cards. My first choice of vendor never
returns e-mails, so I'm looking for another one. Anyone have a
recommendation for a QSL printer that can handle custom artwork in
Illustrator format?
Bill, have a look at www.smeter.net . It has been a while since I tried it,
so I hope that it is still there. I believe that there are some others, but
no info.
73,
Geoff
GM4ESD
On Saturday, June 03, 2006 5:00 PM, Bill Cochran wrote:
Is there a website that offers on line amateur radio
Ron,
As well as checking the 10m beacons, I also find it useful to tune across
the Citizens Band just below 10m for possible openings. But don't be fooled
if you do not hear anything because the skip can be very selective
sometimes, meaning that a path might not be open between you and say a
Sorry about this OT. I keep getting nasty messages from ebay and ebay
customers saying that I have not paid for this or that. I have NEVER used
ebay nor have an account with them, and since none of my neighbours do
either my question is 'How does one contact a HUMAN at ebay?' All my
messages
In case I missed somebody, thank you all for your help. A great family of
'Elecrafters'.
73,
Geoff
GM4ESD
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Mike Davies G0KAD wrote:
A modular system allowing the builder to start simple and build to a
fully featured HF radio would be fabulous.
This approach also makes it much easier to keep the radio's circuitry up to
date
My vote is that XIT is not a useful feature in a rig that has two VFOs A
B, with the SPLIT option. I have never used XIT with the K2 and it does not
exist in my homebrew rigs. Maybe I am missing something?
What I do find very useful, especially in a pileup situation, is a
panadapter /
It seems to me that these days many of the manufacturers of receivers /
transceivers for ham use are attempting to sell the idea that performance is
related to the number of front panel controls i.e. bells and whistles. A
while back I was allowed to play with the latest mind boggling offering
Bart PA3GUY wrote:
This has been on my mind too for a long time. I even seem to recall I've
got a schematic saved somewhere for a circuit that does just that, so
somebody beat us to it. I just never came around to built and test it for
myself For details, contact me offline and I'll try
Vic Rosenthal wrote:
What would this sound like? I've always wanted to try some kind of
crossover device that would distribute the signal between the two
earphones according to frequency. Then as I tune through a CW signal, it
would seem to move. Is this the same idea?
If in some cases the value of C8 has to be reduced OR the value of C7 has to
be increased ( as Wayne suggests ) for proper operation of the 5.068 MHz
oscillator, it would seem that the original capacitor values result in too
much feedback in the oscillator. This could be a batch problem where
Ron D'Eau Claire wrote:
In 50+ years of pounding brass on the Ham bands from 160 meters through UHF,
the only time I've worked at 30 wpm or more with any regularity is when
working a small handful QRQ buddies. That totals much less than 0.1% of my
QSO's. 99% of the thousands and thousands of
A 'top of head thought'. I wonder if some added logic / control circuitry
could do the trick, overriding the existing firmware when 'split mode' is
required?
73
Geoff
GM4ESD
Don N4HH wrote on Tuesday, May 02, 2006 1:33 PM
Agreed! If I could add only one item to the software, it would be
Kevin,
On 40m you were RST 549 at the begining coming from the direction of
northern South America, moving northwards and getting weaker as time went
by, disappearing into the noise at 02:25Z approx coming over Greenland. A
heck of a shift over such a short time. Sorry to report that no other
Ron AC7AC wrote:
That's a powerful reminder that the simple propagation models upon which
most band opening predictions are based are just that: they often have
little correspondence to what is really happening!
-
I
Joe N9JR wrote on Saturday, April 22, 2006 11:10 PM
I have an issue on 30m receive only. When I transmit on 30m I get full
power, and it receives normal, but after a while it loses most of its
sensitivity. Transmit again and it will hear the other side of the earth.
I have noticed that
Bill Allen wrote on Friday, April 21, 2006 2:31 AM
Hey gang,
I seem to have a K2 that is stuck in key down (i.e. xmit). When I turn the
radio on all I get is the ELECrAFt message, that relays cycle normal, and
then a frequency. No front panel controls work except the power knob and it
is
Mike VP8NO wrote on Friday, April 21, 2006 10:25 PM
Wouldn't it be nice to have a second RX module, rather like the external
VFO of old, slaved to the main K2 chassis.
Especially if the K2's 'main' and
michael taylor [EMAIL PROTECTED] wrote:
snip
Perhaps a not so obvious feature, if it is true, is through the use of
either KAF2 or KDSP2 hams listen at a safer volume with less risk of
further hearing lost, by helping our brain by filtering out at least
some of the noise before the brain tries
- Original Message -
From: John Magliacane [EMAIL PROTECTED]
Sent: Tuesday, April 04, 2006 7:00 PM
While every amateur text I've come across states that the D and E layers
disappear at night, they, in fact, do not. They rise to higher altitudes
and
remain ionized through
Test de GM4ESD
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Help:
On Sunday, April 02, 2006 2:30 PM, Jim N2EY wrote:
DOH!
Should read:
If the sun rises an hour earlier, most folks won't get up/go out an hour
earlier to enjoy it. But if it sets an hour later, they will stay up/stay
out
an
hour later.
73 de Jim time lagged N2EY
Jack Brindle [EMAIL PROTECTED] wrote:
But, if you cut off the legs (and file the stubs down), and drill a small
hole in one corner for a small hook, you can then use them as Christmas
tree ornaments. My YF (KB4TGE) even has a pair of ear rings made from
gold ceramic LM107s that I scrounged
Vic K2VCO [EMAIL PROTECTED] wrote:
Dan Barker wrote:
How far from the K2 is the power supply? K2 is sensitive to magnetic
fields.
...and adding the KPA100 makes it more sensitive to them!
-
That's interesting Vic! Have
Don,
Yes, I would agree with all that. I must plead guilty to thinking about
other 'reactions' that might leave some small part of the 'magnetic' problem
remaining, probably not a very useful application of mental effort!
73,
Geoff
GM4ESD.
- Original Message -
Geoff,
I am just
The local oscillator on the XV222 will not generate a sufficient
signal level. The voltage measured at TP1 is 0.45VDC.
When first tested, TP1 read 0VDC. Seeing posts about a balky
oscillator being sensitive to L4A, I adjusted the slug while watching
at TP1. Sure enough, as the slug was
You wrote onTuesday, March 21, 2006 1:19 AM
Cebik had me thinking about a three-armed center-fed dipole array,
but that seems really ambitious for my first attempt. I'm having
enough trouble getting my act together to put up anything there.
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