[time-nuts] Lady Heather

[Mike Seguin N1JEZ]

What's the command to set the map to show satellite signal level vs 
position?


73,
Mike, N1JEZ
"A closed mouth gathers no feet" 



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Re: [time-nuts] frequency reference for portable operation

[Mike Seguin N1JEZ]

Hi Jim,

There are a few different schools of thought. Here in New England, I use a 
very simple GPS locked 10 MHz oscillator. It's based on the Jupiter GPS 
series with 10 kHz out. It drives a Qualcomm 1152 MHz board. This board 
generates harmonics through 24 GHz.


I don't lock any of my rigs up to 24 GHz. From 47 GHz and up (78, 122, 241 
GHz) the rigs are locked mostly using Axtal Axiom 75 series OCXO's and GPS 
via VE1ALQ reflock boards.


For my rigs up to 24 GHz, I use the Qualcomm board to generate accurate 
markers. From there, I can adjust my IF to compensate. The simple GPSDO 
driving the Qualcomm is accurate to about 2 Hz/GHz, so even at 24 GHz, I'm 
typically within about 50 Hz - well within my narrow CW filter on the IF.


The added benefit of using the GPS is I have it hooked to an ON4IY RoverBox. 
This gives me grid square, and Sun position based on location/time for 
aligning my dish (if the sun is out...)  Plus the simple GPSDO is locked and 
running in about 3 minutes or so from a cold start.


I find I don't need "ultimate" accuracy from 24 GHz down. And not messing 
with the crystals in LO's keeps phase noise down etc...


We've started to add Panadpaters to our IF rigs lately using the FUNCube SDR 
initially and now the cheaper sticks. These let us see 96 kHz or better at 
once, so finding the signal can be pretty easy.


Remember, locking is great if both ends are locked. If not, you're back to 
tuning around to find the signal (that's where the panadapter is great!)


KT1J and I did our first 2 km 122 GHz contact a while back. We were both 
locked and had rifle scopes calibrated for aiming. It was amazing to point 
our dishes and start sending and instantly hear the other station with no 
tuning!


73,
Mike, N1JEZ
"A closed mouth gathers no feet"


- Original Message - 
From: "Jim Lux" 
To: "Discussion of precise time and frequency measurement" 


Sent: Sunday, March 10, 2013 10:23 AM
Subject: [time-nuts] frequency reference for portable operation



Asking here on behalf of a friend..

With respect to portable amateur microwave operation.. you want good close 
in phase noise (so you can use narrow band filters) AND good frequency 
accuracy (so you can find the signal)> 



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[time-nuts] Shera Board

[Mike Seguin N1JEZ]

I have a Shera control board that I haven't used in quite some time. I rely 
on my Z-3801A, Thunderbolts etc


Time to sell it if there's any interest. I do not want to ship outside the 
US. It's currently still in the box where it was disciplining a 10544A. The 
board only is for sale. Not the GPS engine or 10544A etc. Pic here:


http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/Sheraboard.jpg

Make me an offer!

73,
Mike, N1JEZ
"A closed mouth gathers no feet" 



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Re: [time-nuts] Jupiter GPS questions

[Mike Seguin N1JEZ]

Hi TJ,

I recently ran into a similar issue with a Jupiter T. No NMEA output. What I 
found was the unit came up in Motorola Binary @ 9600 and sent only an 
initial string out.


The solution here was to use a PIC. (I was actually working with a PIC done 
by Tommy Sullivan called "3DFIXLED")


Here are the HEX commands to send to the unit to make it do 9600 baud NMEA.

1.) 0x40 0x40 0x57 0x62 0x01 0x34 0x0D 0x0A

This is the @@Wb1 command - switch from Motorola Binary to Zodiac Binary

2.) 0xFF 0x81 0x33 0x05 0x03 0x00 0x00 0x07 0xCB 0x71 0x00 0x00 0x00 0x00
0x01 0x00 0xFF 0xFF

This switches to NMEA. There are three additional strings that can be sent 
to

assure sentence output. I'm not sure they are needed, but here they are:

1.) 0xFF 0x81 0x4E 0x04 0x03 0x00 0x00 0x67 0xB0 0x12 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF
2.) 0xFF 0x81 0xEB 0x03 0x03 0x00 0x00 0x67 0x13 0x13 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF
3.) 0xFF 0x81 0xF4 0x03 0x03 0x00 0x00 0x67 0x0A 0x13 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF

There is no ACK that I see. I'd power up and wait a few seconds, then send
the first string, then wait a couple more secs and send at least the second
string.

After doing this, my unit now sends out GPGGA, GPRMC and GPGSA sentences @ 
9600 baud.


73,
Mike, N1JEZ
"A closed mouth gathers no feet"


-Original Message-
From: TJ Fiel 
Subject: Contact: Jupiter GPS questions



Message: Hello KO4BB,

Many thanks for making so many resources available through your
website.  I'd never seen Labmon 7 before and it cured several
problems with previous versions.

I'm attempting to use a Jupiter serial GPS receiver with APRS.  This
is an OEM version made for Etak/Sony about 1999, p.n. TU40-D310-011.
It uses the Rockwell Scorpio DSP (11577-11) but implements few
features.  I've never found a datasheet or even a pinout for this
chip.  Conexant stopped producing this chip about ten years ago and
now they don't appear to answer their phones.  Apparently they never
released chip level data to the public for this DSP, only for
built-up GPS modules.

My biggest issues are automatically forcing NMEA out at startup and
possibly adding an RTC.  Any insights you can give will be greatly
appreciated.

Best wishes and thanks,
TJ Fiel 




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Re: [time-nuts] FEI-Zyfer

[Mike Seguin N1JEZ]

Hi guys,

I was able to simply register at the site then had access to another file 
are that had info on the Nanosync II and their monitor software.


Mike

- Original Message - 
From: "Mike Seguin N1JEZ" 

Subject: [time-nuts] FEI-Zyfer


Anyone have a manual for an FEI-Zyfer Nanosync II? It's listed on their 
website, but clicking on the link throws up a 404 error


Tnx,
Mike
"A closed mouth gathers no feet"




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[time-nuts] FEI-Zyfer

[Mike Seguin N1JEZ]

Anyone have a manual for an FEI-Zyfer Nanosync II? It's listed on their 
website, but clicking on the link throws up a 404 error


Tnx,
Mike
"A closed mouth gathers no feet" 




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[time-nuts] Piezo 2910109

[n1jez]

I have just pulled a 10 MHz Piezo model 2910109 from an old C band uplink 
system. Anyone have a pinout? It has seven pins of which two were connected. 
Tnx!


Mike, N1JEZ
"A closed mouth gathers no feet" 




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Re: [time-nuts] filtering a 10Mhz frequency standard?

[n1jez]

Paul's simple filter:

http://www.w1ghz.org/small_proj/small_proj.htm

Mike

- Original Message - 
From: "Bob Bownes" 
To: ; "Discussion of precise time and frequency 
measurement" 

Sent: Monday, December 12, 2011 10:11 PM
Subject: Re: [time-nuts] filtering a 10Mhz frequency standard?


Paul Wade did a paper on 10Mhz GPSDO filtering for Microwave Update in
October. It is in the proceedings. I don't know if it is available
elsewhere.

Bob


On Mon, Dec 12, 2011 at 9:17 PM,   wrote:

I think you would want to avoid crystal filters due to microphonics.

I've found building good LCR filters harder in real life than on paper. 
(I've done plenty of leapfrog active filters from LCR based designs.) I've 
had to make a passive LCR for ADC testing and secondary (parasitic 
elements of nonideal component) come into play. Nowadays I just buy COTS.



--Original Message--
From: Chris Albertson
Sender: time-nuts-boun...@febo.com
To: Discussion of precise time and frequency measurement
ReplyTo: Discussion of precise time and frequency measurement
Subject: [time-nuts] filtering a 10Mhz frequency standard?
Sent: Dec 12, 2011 5:54 PM

What is the best practice for filtering a 10Mhz sine wave frequency
standard? I've read that you can do more harm than good. Filter
parts (caps, resistors and so on) are all temperature sensitive. But
all those $40 Rb oscillators are putting out a pretty rough looking
sine wave.

Are some types of filters better. I thought about a crystal filters.

--

Chris Albertson
Redondo Beach, California

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[time-nuts] Vectron 229-5657 pin out

[n1jez]

Anyone have the pin out on a Vectron 229-5657 oscillator?  I have several in 
the 100 MHz range.


Tnx!

73,
Mike, N1JEZ
"A closed mouth gathers no feet" 




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Re: [time-nuts] Z3801A & LED display...

[n1jez]

   Sorry, meant to send this directly to Brian.

   Mike
   On Thu Jan 1 8:07 , sent:
   
 That would be neat to get a copy. I've saved a screen shot of a
 Thunderbolt at 23:59:60.
 Thought I'd show it at the 1/10 NEWS meeting.
 Got our new FM antenna installed for WVTQ-FM on Equinox.
 [1]http://vprblog.blogspot.com/2008/12/intrepid-engineering.html
 Mike
 On Thu Dec 31 19:57 , sent:
 FWIW...
 I have one of my Z3801A running with an external LED display
 that's based on one of the Dave Robinson, G4FRE PIC controllers.
 His design reads the raw binary output from the internal GPS RX.
 A mini-disc cam-corder was aimed at the display and caught
 the leapsecond.
 ie:
 23:59:58
 23:59:59
 23:59:60
 00:00:00
 00:00:01
 I'll try and snag a few seconds of video from the DVD around the
 event
 if anybody is interested. Had WWV on in the background but was not
 mic'ed
 very well so sound is low.
 -Brian, WA1ZMS
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Re: [time-nuts] Z3801A & LED display...

[n1jez]

   That would be neat to get a copy. I've saved a screen shot of a
   Thunderbolt at 23:59:60.

   Thought I'd show it at the 1/10 NEWS meeting.

   Got our new FM antenna installed for WVTQ-FM on Equinox.

   http://vprblog.blogspot.com/2008/12/intrepid-engineering.html

   Mike
   On Thu Dec 31 19:57 , sent:
   
 FWIW...
 I have one of my Z3801A running with an external LED display
 that's based on one of the Dave Robinson, G4FRE PIC controllers.
 His design reads the raw binary output from the internal GPS RX.
 A mini-disc cam-corder was aimed at the display and caught
 the leapsecond.
 ie:
 23:59:58
 23:59:59
 23:59:60
 00:00:00
 00:00:01
 I'll try and snag a few seconds of video from the DVD around the
 event
 if anybody is interested. Had WWV on in the background but was not
 mic'ed
 very well so sound is low.
 -Brian, WA1ZMS
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Re: [time-nuts] Why/when did cell towers switch to 15 MHz?

[n1jez]

Not exactly sure why they use 15 MHz, but a good buddy of mine who's a 
Verizon Wireless tech says 15 MHz it is.

Mike
- Original Message - 
From: "Hal Murray" <[EMAIL PROTECTED]>

>> and the usual 15 MHz Cell output.
>
> My Z3801A has a 10 MHz output.  I thought that was normal.  It seems like 
> a
> nice round convenient number.
>
> So why did cell phone towers switch to 15 MHz?  Or is it just Lucent that
> switched?
>
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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[time-nuts] Pinout for Lucent GPSDO

[n1jez]

Anyone have the pinout for the Lucent KS24019L104C GPSDO? There's a 50 pin 
(3 row) connector on the rear. Unit has what looks like an Oncore GT ? GPS, 
Datum 10 MHz OCXO and the usual 15 MHz Cell output.

TIA,

73,
Mike, N1JEZ
"A closed mouth gathers no feet" 


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Re: [time-nuts] simple GPS nmea display.

[n1jez]

Was it VisualGPS??

www.visualgps.net

73,
Mike, N1JEZ
"A closed mouth gathers no feet"

- Original Message - 
From: "Luis Cupido" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement" 

Sent: Saturday, March 01, 2008 8:21 AM
Subject: [time-nuts] simple GPS nmea display.


> Hi,
>
> Long time ago I had a simple software (win 95/98)
> that displayed GPS sats position ax/el and strength
> etc from the nmea info.
> I can't find it or remember its name and nowadays
> searching google with anything containing GPS gets
> tones of stuff... garbage in this perspective...
>
> Can anyone point me to any simple program, must run
> on older machines (windows 98) be and free.
> I mean very basic stuff for sanity checks of system
> antena etc.
>
> Thanks.
>
> Luis Cupido.
> ct1dmk.
>
>
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[time-nuts] SVN23/PRN32 useable

[n1jez]

My Z3801A is using PRN32 now in its solution at 0100Z 2/27/08. It's at 269 
degrees Az and 74 degrees El here in Vermont.

Mike 


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Re: [time-nuts] GPS PRN vs SV...??

[n1jez]

Michael,

You're right! That's what I get for rushing through the list before I went 
to work...

Good catch!

Mike

- Original Message - 
From: "michael taylor" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] GPS PRN vs SV...??

> On Feb 9, 2008 7:13 AM,  <[EMAIL PROTECTED]> wrote:
>> ...I also use Heavens Above. You do need to register, but it's
>> free.
>>
>> For PRN32, once you log in, use spacecraft # 22657  (Navstar 32)
>
> I believe PRN 32 is actually Navstar BIIA-10 (aka 2A-10), COSPAR:
> 1990-103A, or US Control #20959.
> and is identified as "Navstar 22" in Heavens Above.
>
> Based on the first 2 lines of 
> 
>
> GPS BIIA-10 (PRN 32)
> 1 20959U 90103A   ...
>
> -Michael Taylor


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Re: [time-nuts] GPS PRN vs SV...??

[n1jez]

J-track is nice. I also use Heavens Above. You do need to register, but it's 
free.

For PRN32, once you log in, use spacecraft # 22657  (Navstar 32)

This URL will show the current orbital track.

http://www.heavens-above.com/orbitdisplay.asp?Session=kebgcpaanhagkcceebmhgcnb&satid=22657

For all the orbital kep elements I use Space Track.

www.space-track.org

73,
Mike N1JEZ
AMSAT #29649
"A closed mouth gathers no feet"

- Original Message - 
From: "Rex" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] GPS PRN vs SV...??


> Tom Van Baak wrote:
>>> Current status SVNs, PRN etc at:
>>>
>>> http://www.navcen.uscg.gov/navinfo/Gps/ActiveNanu.aspx
>>>
>> That's a good URL. Thanks.
>>
>> More on the SVN vs. PRN issue...
>>
>> When I mistrust a GPS receiver and want to check where a
>> satellite really is, I use the NASA satellite tracker:
>>
>> http://science.nasa.gov/Realtime/jtrack/3d/JTrack3D.html
>>
>> If any of you haven't heard of, or used this java applet yet,
>> I highly recommend it. After you click on +J-TRACK 3D,
>> click on Satellite->Select and pick any GPS satellite.
>>
>> The only trouble: our SV of interest, GPS BIIA-10 (PRN 32),
>> is missing from the list (perhaps because it is still marked
>> unhealthy?), so we can't get its orbit or ground track. I sent
>> a note to NASA and we'll see if they fix it.
>>
>> If any of you know of another satellite tracking web site that
>> shows SVN23/PRN32, let us know, ok?
>>
>> By the way, if one takes a screen capture of each GPS SV
>> in the Jtrack3D list, you get this cute GPS orbit animation:
>>
>> http://www.leapsecond.com/pages/gps-orbit/
>>
>> /tvb
>
> Any hints or clarifications on how to predict when any gps satellite
> should be in view here are appreciated. I think I could get Ham
> satellite tracking software and find the ephemeris information for the
> satellites somewhere, but I was hoping for an easy way for just the GPS
> sats.
>
> Thanks for the heads-up on the new satellite with this binary new-bit
> PRN. (That is the potential issue with why some receivers may not handle
> it -- correct?)


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Re: [time-nuts] John Vig tutorial

[n1jez]

I think HO³ works well this time of year...

Mike, N1JEZ
"A closed mouth gathers no feet"

- Original Message - 
From: "Didier Juges" <[EMAIL PROTECTED]>
Subject: [time-nuts] John Vig tutorial


> Hello y'all,
>
> (maybe I should say Ho Ho Ho...)


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