Robert wrote:
Hey, at least you got vouchers. Here in Cambridge UK the analogue
signal goes off next weekend and you are on your own for converters.
If you had ever seen the video that comes out of the converters made
to the voucher price point, you might not be so keen on the
program.
On 4 March 2011 23:26, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
Robert wrote:
Hey, at least you got vouchers. Here in Cambridge UK the analogue signal
goes off next weekend and you are on your own for converters.
If you had ever seen the video that comes out of the
Hi
Indeed this is my fear. The authorization really has very little to do with
filling in dark holes in the sat coverage and everything to do with setting up
a full blown terrestrial system. This is not going to be a far away and easily
ignored thing. If you have cell phone coverage, you will
Bob wrote:
Indeed this is my fear. The authorization really has very little to
do with filling in dark holes in the sat coverage and everything to
do with setting up a full blown terrestrial system.
Correct. LightSquared's business model is to be a wholesale network
provider. The FCC
Does anyone know if there is a planned or upcoming replacement for the
Tapr TADD-1?
Thanks,
Dan
ac6ao
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Look for a message from John Miles dated Feb 23 with this subject line:
Re: [time-nuts] was there ever a conclusion on distribution amps ?
--Original Message--
From: Dan Rae
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: dan...@verizon.net
ReplyTo: Time-Nuts
Subject:
On 3/4/2011 12:22 PM, Dan Rae wrote:
Does anyone know if there is a planned or upcoming replacement for the
Tapr TADD-1?
We're working on a very high performance distribution amplifier that
will replace the TADD-1 and also be available in a single-channel
version for isolation/buffer amp
Hi
Ok, now it's pretty obvious the RF world near your GPS will be changing a *lot*
in the near future. Lightsquared and a bunch of similar outfits will be camping
out right next door with very high power gear. They will be running 1.5KW from
somewhere in town. GPS is running 30 watts from off
As my age is catching up to me and as part of the process of making life
a bit simpler, I've decided to dispose of a number of the precision time
items that I've acquired over the years. I've put a few things on ebay
that might be of interest, but the 304D is really quite nice and is
fitted
Hi Bill,
Good to hear from you. Thanks for posting and, yes, it's ok to
mention your items.
Tracor 304D http://cgi.ebay.com/260744992504
Austron 1210D http://cgi.ebay.com/260744999533
etc.
I should make everyone on the list aware that I first caught a
serious case of the time bug in the early
On Fri, Mar 4, 2011 at 10:31 AM, Bob Camp li...@rtty.us wrote:
now it's mainly military use. Obviously these guys are a bigger deal
for civilians than the military.
So the question is - do the built in splitter filters have any real rejection
15 to 50 MHz off of center?
Most GPS antenna are
Here's a measurement we did a few years ago on the HP 58535A:
http://www.febo.com/pages/hp_gps_splitter/port_1_hp_58535a_two_port_amp.png
John
On 3/4/2011 1:31 PM, Bob Camp wrote:
Hi
Ok, now it's pretty obvious the RF world near your GPS will be changing a *lot*
in the near future.
Nice RB ref
But really like your clock site Wow.
On Fri, Mar 4, 2011 at 1:38 PM, Bill S w...@jbpet.com wrote:
As my age is catching up to me and as part of the process of making life a
bit simpler, I've decided to dispose of a number of the precision time items
that I've acquired over the
The discussion got me to thinking about how we used to filter out nearby
interference on amateur TV - namely by using interdigital filters. This
led to a search for GPS interdigital filters which i did indeed find.
See Alison Microwave website at
http://www.amlant.co.uk/DetailsAD430.htm for
I used to make some interdigital filters and amplifiers in the early 80's
for MDS TV reception in the 2.3 GHz range. One can easily fabricate a low
loss narrow band filter at 1.5 GHz if need be, and as mentioned before,
antennas should be easy as well. If this really becomes an issue, I am sure
I'm not so sure.
A filter ahead of a preamp significantly increases the system Noise
Temperature.
GPS signals are weak and link margins are small. The receiver preamps are
already very low noise.
I'd think that a narrow filter might well drive up the systen NF to the
point it'd be useless.
Well, as you said John, for FWIW. In this case not much. As said low loss,
so increase in noise temp would be minimal, and, if it makes a difference
between an overloaded front end or a 0.5 dB loss in NF, it will be welcome.
Heck, we use filters in front of most of our Satcom LNBs at 21 GHz with
Preamps with NFs under 0.5 dB are available for the 1.5 GHz region. IMO a
doubling of system noise temperature is non-trivial.
-John
===
Well, as you said John, for FWIW. In this case not much. As said low loss,
so increase in noise temp would be minimal, and, if it makes a
But really like your clock site Wow.
www.precisionclocks.com
Neat. Thanks for the heads up.
--
I know about Bryan Mumford's web site:
http://www.bmumford.com/clocks/emindex.html
How many others am I missing?
--
These are my opinions, not necessarily my employer's. I hate spam.
I used the 0.5 dB number for loss as a worst case. Of course they are
available. They are available even lower, and even at higher frequencies.
Whether or not is trivial is not relevant. What is required is relevant.
This would of course be relevant in small handheld disadvantaged GPS
receivers,
There are far more portable GPS units than fixed, timing units.
Furthermore, the consequences of a position error are far greater.
Hence, a filter option may well not get rid of LightSquared issues for the
majority of users users.
-John
===
I used the 0.5 dB number for loss as a
Argh. Sorry for botching the Subject on my previous message. After a bit of
typing I decided to split it into two, but that was after I had fixed the
Subject and such. Sigh. So here is the other part...
-
My opinions on announcements vs advertising on lists...
I hate blatant
Was looking at the site again. Bill Slocneks (Sorry for the spelling) Really
amazing the quality of work. An incredible talent.
On Fri, Mar 4, 2011 at 9:45 PM, Hal Murray hmur...@megapathdsl.net wrote:
Argh. Sorry for botching the Subject on my previous message. After a bit
of
typing I
I just received my first real piece of time hardware, a M12+T timing GPS.
At least, that's what it's supposed to be, it doesn't actually have any
label saying so. I got it online from this seller:
http://www.ioffer.com/i/Motorola-ONCORE-M12+T-timing-gps-receiver-1pps-100hz-105387652
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