[time-nuts] time-nuts Digest, Vol 96, Issue 70

Bob Camp lists at rtty.us
Tue Jul 17 15:25:48 UTC 2012


Hi

The antenna gain is likely *plenty* for that short a run of coax.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Hoffman, KG6O
Sent: Tuesday, July 17, 2012 11:16 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70

Wow! Great info.

The 5v mag mount antennae are working, but the receivers are cycling between
2-D and 3-D (5 or 6-bird) modes. With the 26dB trimbles, I suspect I'm
loosing ~5db in the 30ft of crumby RG-5, and a little pattern with my
rain-gutter backplane. 

I don't have too much arial obstruction, but that's no excuse from overkill:
I'll be on the lookout for 26- or 40[?!?]-dB cones. 

Does anyone have a Lucent part number available?

-CH

On Jul 17, 2012, at 5:00, time-nuts-request at febo.com wrote:

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> Today's Topics:
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>   1. Re: XL-DC Antenna Requirements (Tom Knox)
>   2. Re: XL-DC Antenna Requirements (Bob Martin)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 16 Jul 2012 18:11:59 -0600
> From: Tom Knox <actast at hotmail.com>
> To: Time-Nuts <time-nuts at febo.com>
> Subject: Re: [time-nuts] XL-DC Antenna Requirements
> Message-ID: <BAY162-W4046E629AF83F1D3BDED81DFDB0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> 
> Hi Chris;
> There were a number of XL-DC produced with 12vdc antenna power and should
be marked near the connector. There are also some marked "Down converter
required". Other then then those the 58532A is a great choice andf sold
under a number of names such as VIC-100, the Lucent antennas are also nice.
The lucent are available in three gains 20, 26, 40 dB version. Most are the
26dB version and are a great product. Placement can be important, and
although you could use indoors it will perform best as low as possible with
a full view of the sky. (Low to avoid terrestrial interference).
> 
> Thomas Knox
> 
> 
> 
>> Date: Tue, 17 Jul 2012 00:50:02 +0200
>> From: azelio.boriani at screen.it
>> To: time-nuts at febo.com
>> Subject: Re: [time-nuts] XL-DC Antenna Requirements
>> 
>> The XL-DC is a 6 channels receiver, so no other benefit other than a
>> greater probability to see constantly 6 satellites is gained from 24 to
32
>> satellites constellation.
>> 
>> On Mon, Jul 16, 2012 at 11:59 PM, Chris Hoffman <cq.kg6o at gmail.com>
wrote:
>> 
>>> All,
>>> 
>>> Though somewhat outmoded, looking forward to starting my own time shop
>>> with two XL-DC controllers that I have been lucky enough to pick up
>>> recently.
>>> 
>>> My question: Do I really need to invest in the likes of the HP 58532A
>>> antennae, or will my surplus Trimble magnetic antennae -- magnetically
>>> attached to a random ferrous backplane -- do?
>>> 
>>> I guess what I am really asking: what are the relevant antenna design
>>> requirements here, and does the advent of as 32-satellite-constellation
>>> have any effect upon the antenna choice (i.e. design downgrade) for the
>>> TrueTime XL-DC?
>>> 
>>> -CH
>>> 
>>> Chris Hoffman
>>> cq.kg6o at gmail.com
>>> http://ar.ctur.us
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> -CH
>>> 
>>> Chris Hoffman
>>> cq.kg6o at gmail.com
>>> http://ar.ctur.us
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
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>                         
> 
> ------------------------------
> 
> Message: 2
> Date: Mon, 16 Jul 2012 18:02:49 -0700
> From: Bob Martin <k6rtm at comcast.net>
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] XL-DC Antenna Requirements
> Message-ID: <8DBEF16D-CE19-4088-9347-458C02A53360 at comcast.net>
> Content-Type: text/plain;    charset=us-ascii
> 
> Chris--
> 
> The 58532A is somewhat higher gain (30dBi or better) than most mag-mount
antennas (26dBi typ IIRC).  The pointy nature of the 58532A also serves as
an avian deterrent, reducing the accumulation of attenuating deposits...
> 
> Running two receivers, I would highly recommend a real GPS distribution
amp such as the 58535A.  Such a beast will let you run both receivers from
one antenna, while providing isolation between the receivers.  I just happen
to have one handy, having recently pulled it out of service and replaced it
with a 4-port model to better support my time-nuttiness.  Contact me off
list if you would be interested.
> 
> 73 Bob k6rtm at arrl.net
> 
> 
> On Jul 16, 2012, at 16:01, time-nuts-request at febo.com wrote:
> 
>> Message: 1
>> Date: Mon, 16 Jul 2012 14:59:52 -0700
>> From: Chris Hoffman <cq.kg6o at gmail.com>
>> To: time-nuts at febo.com
>> Subject: [time-nuts] XL-DC Antenna Requirements
>> Message-ID: <0208B173-9F7B-49B9-AE83-EE231EBBA18E at gmail.com>
>> Content-Type: text/plain;    charset=us-ascii
>> 
>> All,
>> 
>> Though somewhat outmoded, looking forward to starting my own time shop
with two XL-DC controllers that I have been lucky enough to pick up
recently. 
>> 
>> My question: Do I really need to invest in the likes of the HP 58532A
antennae, or will my surplus Trimble magnetic antennae -- magnetically
attached to a random ferrous backplane -- do? 
>> 
>> I guess what I am really asking: what are the relevant antenna design
requirements here, and does the advent of as 32-satellite-constellation have
any effect upon the antenna choice (i.e. design downgrade) for the TrueTime
XL-DC? 
>> 
>> -CH
>> 
>> Chris Hoffman
>> cq.kg6o at gmail.com
>> http://ar.ctur.us
> 
> 
> 
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> End of time-nuts Digest, Vol 96, Issue 70
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