Just a reminder - there's less than 24 hours to make your offer for the
Z90 panadapter. Proceeds to charity.
Jack K8ZOA
On 4/2/2014 4:48 PM, Jack Smith wrote:
I have a very good condition used Clifton Laboratories Z90 panadapter,
with the complete set of running spares available for sale
for shipping by Priority Mail within the US, but for non-US
purchasers an extra charge for shipping will be applied.
6) Please send your bids and any questions you may have to Jack Smith
K8ZOA at jack.sm...@cliftonlaboratories.com
7) The sale includes:
a. Z90 panadapter
b. 12V DC wall wart
8568B spectrum analyzer. But the ZHL-3A amplifiers remain in use and
are essential.
Jack K8ZOA
On 1/1/2014 9:35 AM, Joe Subich, W4TV wrote:
Jack Smith has a kit - everything except case and connectors:
http://cliftonlaboratories.com/z10050a_3_db_hybrid.htm
73,
... Joe, W4TV
On 1/1
In years past, part of my work involved signal propagation (VHF/UHF)
predictions and measurements.
For 150 MHz paging service, the generally accepted in-building
attenuation figure was on the order of 10 to 20 dB compared with an
outdoor measurement in the same location. 10 dB or so for
You might get a somewhat more representative SWR value if the yagi is
vertically mounted so that the reflector is closest to ground and the
director at the top.
The idea is that the reflector will partially decouple the close in
ground surface from the antenna. I've done this with VHF and
The MSDS says Caig DeoxIT is 95% naptha and 5% trade secret.
Internet lore claims the 5% trade secret portion is largely linoleic
acid (from flax seed).
GC Electronics has a much less expensive similar product called
DE-OX-ID which is 60% Aliphatic Hydrocarbon, 35% Kerosene with the
Technically this was figures shift and letters shift and was not
really upper/lower case. FIGS and LTRS may ring a bell.
Letters were the normal A...Z alphabet and figures were numbers 0...9
and punctuation, etc.
Or if you got into some of the weather machines, many of the normal
Treat the Pixel as a second antenna. You will need the KXV3 for this.
http://www.elecraft.com/K3/K3_Antenna_Routing.pdf should answer your
questions.
Use the automatic disable feature of the Pixel's DC power coupler. The
power coupler manual provides a hook up diagram for that purpose.
Jack
I have a new design Norton preamplifier that might be useful for this
purpose.
It has 11 dB gain through 30 MHz and 9 dB at 54 MHz, noise figure is in
the 2.5-3 dB range, OIP2 +85 dBm, OIP3 +42 dBm. The OIP values are
conservative numbers.
When power is switched off, the preamp is
Back in ye olde days of RTTY when we used mechanical printers, the
thinking was that the minimum bandwidth required was that sufficient to
pass the 3rd keying sideband without too much attenuation or time shift.
(This was way before measuring group delay was something that could be
done other
Isn't the 2N7002's internal diode arranged to conduct if the drain is
negative with respect to the source, but the inductive spike from low
side switching will be positive with respect to the drain?
What you really want for this situation where the relay is presumably
inaccessible and hence
Classically, in ye olde days of mechanical printers, diversity combing
was done post detection in the modem. Two receivers feeding two modems,
and the detector outputs of the two modems were combined with a
switching device that selected the output with the best SNR.
With CW, the operator's
I also have several receive only filters that are suitable for AM
broadcast suppression. Two high pass filters and a band-reject filter.
More details on those at
http://www.cliftonlaboratories.com/z10020_am_medium_wave_band_reject_filter.htm
Jim's correct - we used different terms to describe the same phenomena.
And, it should not be forgotten that even if you can characterize a
component in a test fixture and develop an accurate model of that
component reflecting all its manifestations, it may work differently
when installed in
A couple years ago when contemplating kit versions of the high
performance band reject, high pass and low pass filters I sell, I
measured the inductance of 32 toroid cores I wound according to
instructions similar to those found in the Elecraft manual, i.e., with a
certain type core and magnet
The CFL's I've analyzed and disassembled have small switching power
supplies, usually running around 40-50 KHz.
If you are a VLF/LF listener, you can see the emitted signals up through
several hundred KHz. Many sidebands can be observed, at multiples of 60
Hz from the central frequency (which
Dave Jones at EEV.blog http://www.eevblog.com/episodes/ has done a
series of video reviews, including tear downs, of many of the new crop
of inexpensive digital oscilloscopes. The index is chronological, not by
subject category, but if you scroll through it, you'll find several
highly
There seems to be confusion over 50/75 ohm connector mechanical
compatibility.
50 and 75 ohm N connectors are not mechanically compatible as the center
pins are different diameter--50 ohm has larger pin diameter. Over time,
a 50 ohm N male connector can damage the 50 ohm female N and a 75 ohm
Error in sentence ... should say over time a 50 ohm N male connector
can damage a 75 ohm female N connector and a 75 ohm N male may not make
reliable contact with the 50 ohm female.
Too early in the morning.
Jack K8ZOA
On 9/17/2012 6:10 AM, Jack Smith wrote:
There seems to be confusion over
diameter. Over time,
a 50 ohm N male connector can damage the 75 ohm female N and a 75 ohm N
male may not make reliable contact with the 50 ohm female N.
On 9/17/2012 6:10 AM, Jack Smith wrote:
50 and 75 ohm N connectors are not mechanically compatible as the center
pins are different diameter
MIL-STD 348B (3 Feb 2009 edition) contains the reference dimensions for
RF connectors meeting US military specifications.
The center pin diameter for 50 and 75 ohm BNC male connectors are
defined in figures 16 and 85 respectively. In both drawings, dimension
D is the pin diameter and is (min)
As transmitted, frequency error is less than 1 part in 10 to the -12th.
As received, due to Doppler error and other ionospheric issues, and
depending on how you go about the measuring process, something like 0.1
PPM is about it. Maybe a hair better if you have excellent propagation
and you go
Some Chinese BNC male connectors don't properly mate with a
dimensionally correct BNC female.
Not sure where the dimensional problem is, but I've run into the problem
more than once.
Jack K8ZOA
On 8/17/2012 1:15 PM, Rowland R Johnson wrote:
I had the same problem. Replacing the BNC coax
If you look at an HP/Agilent 75 ohm BNC connector you will find it has
no supporting insulation, just the bare spring finger in the female
version or the outer metal shell in the male version.
As far as I have been able to determine from checking dimensional
drawings, BNC 50 and 75 ohm
Don:
Not so at all - whilst the low level SSB generated by the K3's DSP may
be close to theoretically perfect, intermodulation products produced by
the K3's IPA and final amplifier stages are present in quantity and are
the limiting factor.
Jack K8ZOA
On 7/15/2012 8:02 AM,
on the air
compared to using a 3.0 wide filter.
Thanks
Don
~73
Don
KD8NNU
On Sun, Jul 15, 2012 at 8:51 AM, Jack Smith wrote:
Don:
Not so at all - whilst the low level SSB generated by the K3's DSP may
be close to theoretically perfect, intermodulation products produced
by the K3's IPA
-18 dB transfer loss is typical of what I measure.
Solution involves making the mods to the FET follower and in most cases
adding amplification between the IF output port and the Soft Rock input.
Jack K8ZOA
On 6/26/2012 9:25 AM, Roger Dixon wrote:
I've finally completed my Soft Rock for use
McMaster-Carr stocks some Wiha screwdrivers - you have to search their
site for ultra grip http://www.mcmaster.com and I've never had to wait
for delivery.
I use the antislip tip Wiha screwdrivers for Philips and Pozidrive (if
you have HP test equipment, you need Pozidrive) - no doubt about
Kits and Parts stocks some 31 cores. http://www.kitsandparts.com/
Mouser carries the large 2.4 diameter 31 material core, a bit cheaper
than Kits and Parts. 623-2631803802
If you search Mouser for part numbers beginning with 2631 and
Manufacturer = Fair=Rite you will find several other sizes
Alan:
A couple years ago, I measured the DC output for a 1N5711 Schottky diode
at 2, 10 and 21 MHz with RF input from essentially 0 to 1.8V peak
(half-wave rectification). The diode operated into a high Z load (an HP
digital multi-meter) and the RF was from an HP signal generator.
A plot of
S9+5 dB in Fairfax County VA (Washington DC area). Thought it might be
ground wave but too much fading for that.
Jack K8ZOA
On 1/19/2012 2:16 PM, Pete Lascell wrote:
At 1910Z, Jan 19, 2012 received on K3, signal is S7-9 in Lynchburg VA, on
dipole broadside to NE/SW. Other strong signals
The chief driver of diversity gain is antenna separation. The usual
recommendation is 10 wavelengths separation for low correlation fading.
That's impractical for most amateur installations, particularly on the
lower frequency bands where diversity gain may be the most desired.
I've made some
There are quite a few simple switching regulator chips for 12V -- 5V,
requiring only a handful of parts to make a complete switching
converter. For example, National Semiconductor (now TI after the recent
purchase) LM2591HVT-5.0/NOPB. Stocked by Mouser and DigiKey at about $6.
This series is
was used, assuming a Vf around 0.7 volts, and it
would be tough to beat for quiet.
Dave AB7E
On 1/6/2012 9:34 AM, Jack Smith wrote:
There are quite a few simple switching regulator chips for 12V -- 5V,
requiring only a handful of parts to make a complete switching
converter. For example
An inexpensive up-converter kit is available from Jackson Harbor Press.
http://wb9kzy.com/lfconv.htm
I've written an extensive review the converter at
http://www.cliftonlaboratories.com/jackson_harbor_press_vlf_converter.htm
Jack K8ZOA
On 12/24/2011 7:00 PM, Jim Miller wrote:
I think I
Don:
I would add a small caution. The maximum safe voltage rating of a 10x
probe is a function of frequency.
For example, Tektronix's model P6106A, a 250 MHz 10x probe, is rated at
450V below 1 MHz, but only 60V at 10 MHz and perhaps 50V at 30 MHz (hard
to read the graph accurately). All are
It's also possible to power the micro-controller through a diode
isolated super capacitor of 1 or 2 farads that will run it for some
considerable time. The firmware would then detect un-planned power
removal sequence and perform an appropriate save process before the
super capacitor voltage
Steve:
1. 4898 KHz is the nearest to 4915 KHz cheap, off-the-shelf crystal that
Tony (developer of Softrock) found. It has the advantage for anyone not
using a high isolation buffer amp such as the Z1B, that the local
oscillator leakage is outside the K2's crystal filter bandpass. This
I measured the 2nd and 3rd harmonic of WWV's 600 Hz tone this morning
using an HP 8568B spectrum analyzer set at 15 MHz, 30 Hz resolution,
connected to an antenna. This avoids the harmonic generation that might
be found in a receiver's audio stages, for example, such as when
measuring tone
WWV has 100 Hz data transmission and you will see the sidebands at ±100 Hz.
Jack K8ZOA
On 11/8/2011 6:21 PM, Ron D'Eau Claire wrote:
I see two sidebands very close to either side of the carrier, and identical
amplitude/spacing sidebands on either side of the tones. They are at about
+/-60Hz
Poul-Erik:
You have an implicit assumption that the spectrum analyzer to transmit
antenna has a flat response with respect to frequency.
That's unlikely to be the case.
Another assumption is that the spectrum analyzer antenna is in the far
field of the antenna. This is also unlikely to be the
First, even a very thin gap may significantly reduce the core
permeability. A high quality split core will have its mating surfaces
lapped flat.
Second, if the core cracked because of excessive heat, it's likely the
ferrite material incurred irreversible damage.
Jack K8ZOA
On 10/16/2011
A few years ago, I measured a length of plastic (some form of vinyl, I
believe) insulated zip cord with the loss results below.
Impedance over the range 300 KHz - 30 MHz varied from 118 ohms to 124 ohms.
Jack K8ZOA
Frequency MHz Loss (dB)/100 ft
5 2.3
10 3.5
15 4.6
20
The VF-1 could be considerably improved if operated from a separate
power supply and left on long enough to thermally stabilize. Not saying
it could be confused with a crystal controlled oscillator, but a lot of
its problems were related to voltage changes from the associated
transmitter.
Looks like the FSK/DATA mode filter may be ringing - eyeballing the
filter envelope looks like it has some dips. A bit more bandwidth might
help - and the other time I've seen this is when there's a tuning error,
such that the two bandpass filters are not exactly centered on the
mark/space
Don:
I recently had a question from a prospective customer for a Z1B
buffer amplifier about the need for additional isolation if a Softrock
is used with the P3's splitter IF output.
I can't find a spec for the P3's isolation between the IF output port
and the IF Input, but 30 dB isn't a
Five interesting patents on underground and survivable antennas (such as
embedding the antenna in a large concrete block):
3346864
3594798
3705407
3803616
4687445
To view or download a PDF of these patents, go to
http://www.google.com/patents/ and enter the patent numbers.
Jack K8ZOA
On
As a very small designer and seller of kits, I've been forced to move
almost all of my new designs and updated older designs to surface mount
construction. Through hole parts are either drying up, and, more
importantly, high performance parts are not made in through hole packages.
So far, I've
I recently measured, using lab grade equipment, 16 powdered iron toroid
inductors of approximately 2uH and 16 of approximately 9 uH, at a fixed
frequency. Details can be seen at
http://www.cliftonlaboratories.com/may_2011.htm under 15 May 2011 entry.
The purpose of the exercise was to assess
I use DipTrace for all Clifton Laboratories PCB work and like it a great
deal. It's much more intuitive than Eagle.
Jack K8ZOA
On 5/25/2011 6:18 PM, Sverre Holm (LA3ZA) wrote:
I would recommend DipTrace over Eagle. Although Eagle is used by almost
everyone, DipTrace is a much more modern
Is the receiver general coverage or ham band only?
Jack K8ZOA
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list
I'm not all that interested in QRP, but a high performance, battery
operable, general coverage receiver is something I would find very
useful, so expect an order as soon as the queue establishes.
Only thing I see missing from the receiver side is coverage below 500
KHz - while this can always
10 years ago, I measured the loss of zip cord, with the results below.
The measured results are based on a 17 ft length of zip cord.
Frequency Measured Loss (dB) Loss (dB)/100 ft
5 0.4 2.3
10 0.6 3.5
15 0.8 4.6
20 0.955.5
25 1.2 6.9
30
I measured 108 ohms for the sample I tested in 2001, black AC power type
zip, vf around 0.65, but varied with frequency. Also looked at paired
red/black wire usually used for low voltage DC and found it a bit higher
Zo, around 118 to 125 ohms, not constant with frequency. Higher Zo is
Geoff list readers ...
There's an article in the current Electronics Design News, as a matter
of fact, on pre-distortion.
http://www.edn.com/article/518070-RF_predistortion_straightens_out_your_signals.php
Although aimed at cellular radio digital modulation, the concepts apply
to analog SSB
A classic comb generator products equal level harmonics.
In the time domain, it is an impulse waveform--in the limit infinitely
narrow. It can be approximated by differentiating a fast rise/fall
square wave with an RC circuit.
If you search comb generator you can find many implementations on
Only to a first approximation are filters linear.
Usually the major source of non-linearity is in the inductors. Even
powdered iron is non-linear to some degree. Ferrite is worse, of course.
Air is pretty close to perfect.
Capacitors are also non-linear at some level, as C is not constant with
Alan:
One are where a square wave RF source can get you into trouble is 2nd
and 3rd order intermodulation measurements.
Mini-Circuits Ap Note 8 discusses the reason why.
http://www.minicircuits.com/pages/pdfs/AN8.pdf
I usually use an outboard low pass filter on my HP 8657A signal
?
Alan N1AL
On Thu, 2011-04-14 at 16:54 -0400, Jack Smith wrote:
Alan:
One are where a square wave RF source can get you into trouble is 2nd
and 3rd order intermodulation measurements.
Mini-Circuits Ap Note 8 discusses the reason why.
http://www.minicircuits.com/pages/pdfs/AN8.pdf
I
RG9 (or its modern version, RG-214) has two woven shields of silver
plated copper.
Jack K8ZOA
On 4/13/2011 2:08 PM, Ken Roberson wrote:
Lew,
Look up RG9 I think it 52 OHM coax that has two shields.
73 Ken K5DNL
--
Wayne:
As an extension to this feature, a quasi-simultaneous S-meter read of
main and sub receivers would be very useful in evaluating antenna gain
and diversity reception.
Ideally the main and sub signal strength readings would be captured at
the same time, but if some short delay is
On 3/19/2011 9:34 PM, Paul Christensen wrote:
Major snip of excellent information
At least some AM stations operating with digital subcarriers are GPS
locked and can be extremely accurate. WMAL 630 KHz here in the
Washington DC area is one example. It's as close to 630 KHz as I can
measure
I suspect there's a larger market there than you might think, at that
price. TenTec RX-340 runs a bit over US$ 4K. NRD 545 (discontinued) go
on the used market for $1.3K.
Both of those receivers are much larger physically than the K3, so there
may be some resistance in paying more per cubic
I've found the same problem with two batches of Teflon insulated, single
hole mount SO-239 connectors manufactured in China and purchased from RF
Connection. The center pin spins within the Teflon bushing and unless
the user is extremely careful when connecting a PL-259, the wire
connected to
It's easy enough to inadvertently to rotate the center pin when mating
with the PL-259 particularly with small diameter coax cable and where
the connector is not the easiest to access. Push the center pin in, and
then find the coax isn't routed exactly like it should be, move the
cable around
Although it's a few years old now, perhaps my book on PIC programming
with MBasic would be of interest. It has several amateur radio related
projects.
http://www.amazon.com/Programming-Microcontroller-MBASIC-Embedded-Technology/dp/0750679468/ref=sr_1_1?ie=UTF8qid=1297433542sr=8-1
Jack K8ZOA
Ian:
I've written about simple diode RF detectors at
http://www.cliftonlaboratories.com/diodes_for_rf_probes.htm
These are not 50 ohm terminated, so it would be a matter of adding a 51
ohm resistor (nearest 5% value) across the RF port). Or a 47 ohm would
be fine for this purpose.
Jack K8ZOA
I've written about simple diode RF detectors at
http://www.cliftonlaboratories.com/diodes_for_rf_probes.htm
These are not 50 ohm terminated, so it would be a matter of adding a 51
ohm resistor (nearest 5% value) across the RF port).
Jack K8ZOA
On 1/7/2011 4:37 AM, Ian White GM3SEK wrote:
BPS makes a small grid prototype board that will mount a variety of SMT
parts - one board accommodates different size parts.
http://www.busboard.us/pdfs/BPS-MAR-SP3UT-001.pdf
Mouser carries it, and I imagine DigiKey and others as well.
It's tedious to use, but what isn't when prototyping with
Search Mouser's on-line catalog using the words: ribbon ferrite
www.mouser.com
These are made to clamp over computer ribbon cable and are available in
a variety of physical sizes and permeability. You should find both split
cores with plastic clamps as well as standard cores.
Jack K8ZOA
On
All the right angle BNCs I've seen are M-F type. But you could use a
M-F right angle and a M-M connector to make what you need.
If a M-M right angle exists, it's probably carried by The RF Connection.
http://www.therfc.com/
I would call and inquire.
Jack K8ZOA
On 1/1/2011 6:09 PM, James C.
I buy 90% isopropyl alcohol at Wal*Mart and use it for PCB cleaning. I
think it's a couple dollars for a quart bottle, available in the drug
section. I've also found 90% at most drug stores or supermarkets if you
look carefully.
It's a lot cheaper than Everclear, but you can't consume the
Lew
Don't forget that PayPal will take about 3% out of the payment.
Jack K8ZOA
On 11/18/2010 12:56 PM, Lew Phelps K6LMP wrote:
This looks like a situation in which the only means for members of this list
to obtain one of these headsets (which I own and like very much!) is for a
U.S. ham
The most recent experience I've had is with single hole mount SO-239
connectors, Teflon insulation, purchased the The RF Connection.
I installed six of them in a batch of Norton preamplifiers Friday and
when I plugged a UHF-BNC adapter in to connect some test equipment, I
noticed the center
Racal's RA-17 was an up-converting receiver, with a first IF at 40 MHz.
However, the 40 MHz IF filter was wideband, with the real selectivity
applied at 1.6 MHz and 100 KHz. With the Wadley Loop tuning system, it
was an extremely advanced design for 1955, all done with vacuum tubes,
of course.
In small quantities, boxes of 100, I pay about 3.5 cents each for 4-40
1/4 inch stainless steel (18-8) pan head screws used in my kits. Similar
zinc plated steel screws are 1.2 cents each, for a difference of 2.3 cents.
In a kit with 100 of these or similar screws, the cost difference would
VE7GZ tried using an SM220 with his K3 a couple years ago - some posts on the
subject should be in the reflector archives.
Although it isn't hard to move the center frequency, the SM220 is not sensitive
enough to provide a useful display with the K3 from what he said. Considerable
external
Bob:
There are two possible 'spike' concerns here.
One is the so-called 'zero' point spike in the software defined
receivers. This is mostly a function of ground loops between the sound
card and the Softrock. It can be removed by transformers or some careful
work with the audio cables and
If the RTTY demodulator is of the FM type, i.e., a limiter followed by
a discriminator (or, more likely these days, the software version of a
limiter and discriminator) 3 dB difference between two signals could
well cause the stronger signal to capture the limiter and suppress the
weaker
With respect to AC mains power standard, Tom Edison set the standard voltage
(DC) at a nice even number 100 volts, plus 10% allowance for IR drop, yielding
110V, or so I recall reading.
Over the years, the 'norm' has crept up to 115V, 117.5V and 120V. It's
typically 122 to 123V at my QTH.
Spectrum Laboratory by DL4YHF http://www.qsl.net/dl4yhf/spectra1.html
may be able to do this already.
If the K3's 15 KHz IF output were available from the main and sub
receivers, Spectrum Laboratory could use those to generate the automatic
phase display using the direction finding feature.
If you plot the fade statistics for HF signals, however, you find many
times that the result looks much more like Rician fading than Rayleigh.
Jack K8ZOA
On 9/16/2010 2:11 PM, Kok Chen wrote:
On Sep 16, 2010, at 9/169:59 AM, Jim Brown wrote:
A VERY large component of fading is due
The reason for an SMA is that it mounts in a 0.25 inch (6.35mm) hole
and can be fitted onto a K2 rear panel with all possible options
installed. It was not possible to get a BNC to work under all conditions
of K2 options.
The particular SMA provides shielding integrity, unlike using a panel
There are low cost alternatives to the P3, such as (cheapest) an 8 MHz
Softrock Lite II board or the more expensive but better integrated
LP-PAN, so that it is possible to discover how useful a panadapter is
without a major financial commitment.
If a panadapter turns out to be useful, you
In evaluating diversity gain of a Z1501D active antenna against
various transmitting antennas, I use two spectrum analyzers, one
connected to the two antennas to be evaluated. The spectrum analyzers
are set for 0 Hz span and a 100 second sweep, providing a signal
strength data point every
Sounds like an application for a high pass filter. That strong a signal,
and that it is not being detected by other receivers, certainly sounds
as if it is being generated in the K3 due to overload.
There are 100 watt transmit power level AM broadcast band high pass
filters available that can
We have a Carrier high efficiency propane furnace nearly 20 years old
with an inverter powered blower motor. It radiates RFI in the 100-300
KHz range, but fortunately nothing higher.
Jack K8ZOA
On 3/4/2010 11:47 AM, Don Nelson wrote:
Hi all,
There was a discussion some time ago about RFI
The graphics processor makes a big difference. I have several Dell
SX-260 computers that run SDR programs painfully slow, despite 2 GB of
RAM and 2.5 GHz CPU.
It turns out that Dell's graphic processor has no dedicated memory but
rather shares normal RAM. That creates a huge bottleneck when
The Z1B buffer amp PCB at 8 MHz has an input impedance dominated by
4.7K to ground and about 2 pF shunt capacitance. The 200 ohm resistor is
in series with the input and is not of significant concern in the input
impedance relationship.
Even with a reasonable length of coaxial cable
Swordfish is an excellent product. I've used it for my Z90/91 panadapter
and also the Z100 CW/RTTY tuning aid.
Jack K8ZOA
On 2/7/2010 2:09 PM, Ken Nicely wrote:
This is a little off topic as it is not something that might be of great
interest to some owners of Elecraft equipment unless they
Pair of HP 8657A synthesized generators 100 KHz - 1024 MHz
Pair of HP 8640B analog w/ lock generators, one with internal doubler
(1024 MHz) and reverse power protection
Panasonic VP8191A synthesized 100 KHz - 135 MHz
8640B is quite plentiful, and when properly working is very hard to
beat for
Buy a crimp tool and use crimp connectors.
Two types of crimp connectors are available, single crimp and double
crimp. Single crimp uses a solder-in center pin and crimp shield and the
double crimp version crimps both the center pin and the braid. I have a
slight preference for double crimp,
There are prefab cables and then again there are prefab cables.
A few years ago, I was given a couple of boxes of BNC jumper cables,
new, intended for computer to network jumpers. RG-58 size cable, molded
on boots.
After several of these proved less than reliable, I cut several apart.
The
That should be RFX series, not RX series. It identifies Amphenol's
commercial grade line.
Jack
On 1/28/2010 8:51 AM, Jack Smith wrote:
There are prefab cables and then again there are prefab cables.
A few years ago, I was given a couple of boxes of BNC jumper cables,
new, intended
I don't use many PL259 connectors these days, but when I do, it is a
double crimp version, silver plated from RF Industries if I recall
correctly. Those install like a charm in a matter of a minute or less.
(I also have a special tool that strips the jacket, braid and center
conductor to the
For a comparison point, you might wish to look at my K2 stability
measurements at
http://www.cliftonlaboratories.com/k2_freq_stability.htm
Jack K8ZOA
On 1/20/2010 8:58 AM, Don Wilhelm wrote:
Doug,
The BFO is obviously the culprit here.
What serial number is this K2?
Do you have the new
Let me add some quantified data on monitoring delay.
In the telephone industry, the signal from the transmitter back to the
earpiece is is called sidetone. In the conventional analog telephone
network, sidetone is generated locally in the telephone instrument, but
can also come from
The LP-Pan has an AD 8007 input amplifier, the same amplifier I use in
the Z1 buffer amp.
In the LP-Pan, the AD8007's gain is set by a combination of fixed
resistors and a potentiometer. Quickly working through the numbers,
varying the potentiometer from one end to the other results in
An alternative to Palomar is the VLF converter kit from Jackson Harbor
Press.
I wrote a detailed review of the kit at
http://www.cliftonlaboratories.com/jackson_harbor_press_vlf_converter.htm
Jackson Harbor Press can be found at
http://home.att.net/~jacksonharbor/ham.htm. Look for the LF
Robert Pease, in Troubleshooting Analog Circuits (p. 82) provides a
useful anecdote on the subject of modern silicon semiconductors and
soldering iron heat:
...Overheating does not by itself cause failure. I once applied a
soldering iron to a 3-terminal voltage regulator--I hung it from
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