Re: [time-nuts] Upgrading possibilities for more accurate, precise stable time system

2007-12-16 Thread Brooke Clarke
Hi Ronald:

Have a look at the different time transfer methods at:
http://www.prc68.com/I/timefreq.shtml#TT

Since these involve receiving a signal from a transmitter you need to have a 
way to know which signals you can get in your building.

For example LORAN-C and WWVB are low frequency signals.  CDMA cell phone is 
microwave.  VLF military stations are used to send subs encrypted messages and 
have well controlled carriers.


Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam


Ronald Held wrote:
> i thought of tha balcony option. The balcony as an overhang which
> effectively blots out the other half of ths sky not covered by the
> building. I cannot hang any antenna over the railing or on it(in my
> lease and enofrce;I asked), plus there are birds and squirrels which
> would get into it.
> Any other suggestions?
> 
> 
> 
> 
>>Date: Sat, 15 Dec 2007 21:25:14 -0600
>>From: "Jack Hudler" <[EMAIL PROTECTED]>
>>Subject: Re: [time-nuts] Upgrading possibilities for more accurate,
>>   precise  stable mark ii
>>To: "'Discussion of precise time and frequency measurement'"
>>   
>>Message-ID: <[EMAIL PROTECTED]>
>>Content-Type: text/plain;   charset="us-ascii"
>>
>>If you have a porch or balcony, just drilled a 1/4 inch hole through the
>>edge of the sliding door frame to handle an external antenna. Hide the wire
>>in the carpet edge or behind the baseboard.
>>When you leave just caulk up the holes and no one's the wiser. Most of the
>>time (well the ones I lived in) apartments have touch up paint kits (or the
>>paint codes at the local big box) so you can fill nail holes and such for
>>move out.
>>
>>I did this at four different apartments and no one ever found it, or if they
>>did, didn't care. Most of the time I drilled three holes for coaxial cables
>>to DirecTV and 58532A GPS antenna mounted on the back of the DirecTV antenna
>>(Note: I never used the thin flat strip to run coax through the door there
>>was too much static build up. That being said; it is still a viable option
>>for GPS or DirecTV).
>>
>>
>>
>>
> 
> 
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Re: [time-nuts] Upgrading possibilities for more accurate, precise stable time system.

2007-12-13 Thread Bruce Griffiths
Ronald Held wrote:
> Greetings:
>I am very new to this list. I do not have the necessary circuit
> skills, so i would have to buy preassembled components. I have a
> EndrunTCXO discipline via CDMA signals, which go into a display
> unit driven by a STAMP microprocessor(AFAIK, since Bob build and
> programmed it.
>Given that i cannot receive GPS signals in my apartment, what are my 
> options?
> Ronald
>
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>   
Ronald

You could upgrade from a TXCO to a good OCXO and decrease the discipling
loop bandwidth.

Bruce

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[time-nuts] Upgrading possibilities for more accurate, precise stable time system.

2007-12-13 Thread Ronald Held
Greetings:
   I am very new to this list. I do not have the necessary circuit
skills, so i would have to buy preassembled components. I have a
EndrunTCXO discipline via CDMA signals, which go into a display
unit driven by a STAMP microprocessor(AFAIK, since Bob build and
programmed it.
   Given that i cannot receive GPS signals in my apartment, what are my options?
Ronald

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