[time-nuts] Lucent 40 dB Antenna

J. L. Trantham jltran at att.net
Sat Apr 14 14:54:12 UTC 2012


Bjorn,

My setup is a Lucent 26 dB antenna on a bracket on the edge of the roof at
the corner of my workshop feeding about 20 feet of 9913 coax (7.5 dB
attenuation per 100 feet @ 2.4 GHz) to a 58536A four way splitter that feeds
a Z3816A, Z3805A, TBolt, with a 'spare' for playing with.  The splitter uses
about 2 feet of 9913 to the Z3816A and the Z3805A and the TBolt is fed with
about 6 feet of RG58 with BNC connectors and adapters for BNC to F and BNC
to N.

With SatStat and a Z3816A, C/N is typically 30 to 50.  With TBoltMon or Lady
Heather and a TBolt, dBc also typically 30 to 50.  I didn't see much
difference on either with switching antennas but I suspect I have a fair
amount of signal to start with (Lat of 30 degrees but under trees).

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of bg at lysator.liu.se
Sent: Saturday, April 14, 2012 5:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent 40 dB Antenna

Hi Joe,

40dB is not needed when you have a short (<10m) /good antenna cable. Then
26dB will be plenty fine. Howver going to 20 or 30+ meters using standard
RG58 will be a problem with 26dB. Ofcause what matters is the attenuation
at L1 with your cable. Better cable can be longer...

You do not need an spectrum/network analyzer. Take a your antenna and
receiver to a good site, if you installation site might be marginal. Your
C/N0 (snr) should be around or above 50dBHz for high elevation satellites.
Then compare the C/N0 values for you antenna at your workshop, to see how
much worse than "perfect" that site is. If using a Tbolt remember to
change from Trimble AMU into dBHz.

Note that LNA dB amplification not generally translate direcly into dB
carrier to noise ratio.

--

   Björn

PS I got a small batch of HP timing antennas new in box for around $25 a
piece some years ago... :-) DS

> Mine arrived in the same manner.  It works but I can't tell any real
> difference between it and my 26 dB antenna, switching between them when
> mounted on the corner of the roof of my workshop.
>
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Steve Krull
> Sent: Friday, April 13, 2012 1:40 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Lucent 40 dB Antenna
>
> Just got mine, from "Just_for_survive" on eBay. Poorest packing job I've
> ever seen for an international package. Three wraps of newsprint and a
> thin padded envelope. I'll know this weekend if its operational.
>
> Steve
>
>
>
> On Tue, Apr 10, 2012 at 11:14 PM, Chuck Forsberg WA7KGX N2469R wrote:
>
>> My Lucent antenna arrived today.  I scrounged some adapters
>> and connected it to my Thunderbolt.  Two birds were visible
>> with AMU > 4 when I held the antenna.  My Droid 3 could not
>> see any birds through the wet roof.
>>
>> The unit has some dings and scrapes but no visible corrosion.
>>
>> I am tempted to take it apart but don't wish to break a unit
>> which seems to be working well.
>>
>> Has anyone compared this antenna with the mushroom that
>> came from China with the used Thunderbolts???
>>
>> --
>> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
>> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>>   Omen Technology Inc      "The High Reliability Software"
>> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>>
>>
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