Thanks Dick, Ok with interference that close it would help. Shielding doesnt
always provide much at these frequencies and can reduce the Q of the loop.
Best Wishes
Alan G3NYK
- Original Message -
From: Dick Moore rich...@hughes.net
To: time-nuts@febo.com
Sent: Sunday, October 03, 2010
On 10/03/2010 11:03 AM, Alan Melia wrote:
Thanks Dick, Ok with interference that close it would help. Shielding doesnt
always provide much at these frequencies and can reduce the Q of the loop.
I would be careful not to close the shield into a loop, so it only acts
on E-field and not H-field.
On 10/03/2010 11:43 AM, Alan Melia wrote:
Yes Magnus, a break to avoid the shorted turn effect
As I suspected, it's a peculiar detail otherwise easilly missed.
Cheers,
Magnus
Alan
- Original Message -
From: Magnus Danielsonmag...@rubidium.dyndns.org
To:time-nuts@febo.com
Sent:
Years ago I built a modification of the double shielded WWVB loop
antenna described by Don Lancaster in a 1973 magazine.
http://www.swtpc.com/mholley/RadioElectronics/Aug1973/RE_Aug1973.htm
I have been using that same antenna ever since with good results in NH
where the signal is pretty weak
On 10/03/2010 03:33 PM, Arthur Dent wrote:
Years ago I built a modification of the double shielded WWVB loop
antenna described by Don Lancaster in a 1973 magazine.
http://www.swtpc.com/mholley/RadioElectronics/Aug1973/RE_Aug1973.htm
I have been using that same antenna ever since with good
Yes I do have the manual - I also travel to all corners of the known universe
and if I'm home I might be there for 24-48 hours. I finally got it scanned
and sent a copy to chuck. I overestimated my ability to scan and return the
manual in a timely fashion.
I also have paid for and never
PM sent.
-Chuck
scmcgr...@gmail.com wrote:
Yes I do have the manual - I also travel to all corners of the known universe
and if I'm home I might be there for
24-48 hours. I finally got it scanned and sent a copy to chuck. I
overestimated my ability to scan and return the
manual in a
John - It has been a while since I have seen the waveform. What is the rate
of change of phase per unit time? Or, the occupied BW? Thanks - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: time-nuts-boun...@febo.com
John-…”HP's loop for the 117A is not tuned, as I rember, but it
is followed with a narrow band amp.“
Both the nuvistor and FET versions of the loop show capacitors across the loop
winding to tune it.
http://www.leapsecond.com/museum/10509a/
-Arthur
The loop will be tuned (!) but hopefully to a freqency much above 60kHz by
the inter-turn and turn to screen capacitance. Also hopefully this will be a
low Q resonance and the phase frequency response at 60kHz should then be
stable with ambient conditions. Interestingly a lot of the modern LF and
There are some interesting VLF antenna/amplifier designs on vlf.it
I used one of them as inspiration and built my own AD797 based
indoor loop antenna: http://phk.freebsd.dk/loran-c/Antenna/
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
There is a large post office on Mt.Auburn Street within 1200 feet of the
place you worked for over a year of the time you had Chuck's manual.
There is a Post Office within 6 miles of your home, whether you go North,
South or East.
The manual will fit within a USPS Flat Rate box.
-John
The air core loop may well be suggested because the incremental
permeability of the ferrite, hence the inductance, varies with
temperature.
-John
=
[snip]
Interestingly a lot of the modern LF and
VLF
Off-air Standards use ferrite rod antennas and there are known problems
with
John,-My concern with tuning the loop is that as the tuned circuit drifts with
temperature, or other things, an extraneous phase shift will be intoduced
to the received signal. Remember, the phase of a complex pole pair tuned
circuit goes from +90 to -90 degrees as you sweepo through resonance.
I observed a diurnal phase shift with my 117A system. I never investigated
whether this was due to loop phase shifts with temperature or propagation,
but it was likely a combination.
These phase shifts matter less if you are doing long term (multi-day)
measurements, but, to be valid, your system
I am about to marry a T'bolt with an E1938A and wonder if anyone has
any idea of good starting values for TC, Damping and gain?
Thanks,
Dan
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
This has to be the coolest POV clock ever:
http://www.elektronika.ba/779/pov-propeller-clock-build/
Joe Gray
W5JG
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow
I have been very superficially following this topic and looked at some links
about 60 KHz Loop antennas, including one on Tom's site (I think?) describing
building one out of 100 feet of RG58 coax.
Could CAT 5 cable be used? It is 4 twisted pairs and you can get it shielded.
Any issue with
Gents,
I have several Lucent rubidiums that seem to be .02 Hz off at 15 MHz compared
to the 15 MHz Lucent GPS. Does anyone know how to either phase lock it to a
GPS of install something like a 20 turn pot to adjust the control pin frequency
so an exact match may be achieved?
Regards,
No not compatible. But check Paul Swedberg's Loran simulator here:
http://www.n4iqt.com/simloran/
Stanley
- Original Message
From: Perry Sandeen sandee...@yahoo.com
To: time-nuts-requ...@febo.com time-nuts@febo.com
Sent: Sun, October 3, 2010 5:19:02 PM
Subject: [time-nuts] AUSTRON
It hears WWVB quite well, but then it is a rather strong
signal.
Seriously, a HP3586B would be a fine receiver for a WWVB
timing setup, but way, way, overkill.
In other words, perfect for time-nuts!
-Chuck
Perry Sandeen wrote:
Gents,
Has anybody used a HP 3586B for a 60KHz receiver? If so,
Depends on which one you have but the one with heat sink fins on the front has
a
adjustment pot under a screw on the front appears as a break in the 3rd fin
from
the left. Don't know about the gold color case one's.
Stanley
- Original Message
From: Perry Sandeen
List
The HP 10811 type oscillator is used for both the HP 5370B TIC, the HP 3586B
SLV with the high stability option, and the HP 5335 frequency counter which I
have. But none of them make use of the EFC option that I’m aware of. They do
use EFC for the HP 3336B frequency generator that I
I'd think the capacitance of the coax would present problems.
Before I got the cannonical antenna for my Austron LORAN Rx, I used a
roughly 30 square of 3/4 Cu tubing threaded with a bunch of #18
insulated hookup wire. The slick glop electricians use helped a lot. What
a mess though.
-John
Hi John,
Comparison to a local standard would probably work out better
with a TRF receiver than with a superhet... too many standards
to sort out.
It would be trivial to use a 3586B to detect the time signal, you
can hear it chugging along merrily.
-Chuck Harris
J. Forster wrote:
Hi Chuck,
Gents,
Wrote Has anybody used a HP 3586B for a 60KHz receiver? If so, how well did
it work?
Replied Seriously, a HP3586B would be a fine receiver for a WWVB timing setup,
but way, way, overkill.
Thanks. That’s great news. I have three working and can probably fix three of
the other four
Gents,
Wrote I have several Lucent rubidiums that seem to be .02 Hz off at 15 MHz
compared to the 15 MHz Lucent GPS. Does anyone know how to either phase lock
it to a GPS of install something like a 20 turn pot to adjust the control pin
frequency so an exact match may be achieved?
Reply
My RMS Engineering receiver is quite old and in fact was
designed to only receive 18 or 20 KHz signals. All the transistors
are 2N404 Ge. Way back someone was selling a conversion
kit to make this unit operate on 60KHz for WWVB. The way
it works is the 100KHz from an external standard is fed
Won't work completely different. I built a very simple loran c sim and the
docs were available online. But just checked the N4IQT links on yahoo and it
looks like the infos gone.
The sim allows you to at least the 2100f as a very nice phase comparator
between two sources.
You have the canadian
the 3586s work fine for hearing wwvb.
But it does get interesting on tracking the signal. Its tough on the
eastcoast.
On Sun, Oct 3, 2010 at 7:45 PM, J. Forster j...@quik.com wrote:
Hi John,
Comparison to a local standard would probably work out better
with a TRF receiver than with a
- Original Message
From: paul swed paulsw...@gmail.com
To: j...@quik.com; Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, October 3, 2010 10:06:40 PM
Subject: Re: [time-nuts] AUSTRON MODEL 2100F Conversion
Won't work completely different. I built a
Yahoo has problems try http://n4iqt.com/simloran/
Stanley
- Original Message
From: Stanley Reynolds stanley_reyno...@yahoo.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, October 3, 2010 10:26:37 PM
Subject: Re: [time-nuts] AUSTRON MODEL
32 matches
Mail list logo
