Re: LF: DXl VLF experiments in 3HD

["PA1SDB, Peter" <pa1sdb@amsat.org>]

Hello Jim,

Just in coincidence I was already operating V2.79 B10 [3], but it works perfect here. I use that SKM52 that G0UPL sell's at his website.

It has a pin out with only a 1 PPS output. Befor I did SR-cal at a VLF signal like 22k1Hz, but the 1 PPS signal preforms much better.

I did split the 1 PPS signal with some R's and feeding 2 audio cards with it now.

 

 

 

 

I did QRPp the GPS output with a 3k3R and 180R like this diagram that you find in the Spectrum Lab documentation.

I don't use that 22K resistor (need no NMEA

Otherwise the signal level is to high for the Sound card. I was able to adjust PPS level with adjusting the soundcard input mixer.

 

 

 

 

73's, Peter PA1SDB

 

www.qsl.net/pa1sdb

 

 

 

 

----- Original Message -----

From: hvanesce

To: rsgb_lf_group@blacksheep.org

Sent: Monday, February 03, 2014 8:34 AM

Subject: RE: LF: DXl VLF experiments in 3HD

Markus,

 

Thank you for the information on SpecLab. Today will be my first attempt to use external synchronization with SpecLab, and my most-accurate time standard has 1-pps and 10MHz outputs. I have hoped to be able to use the 1-pps output for 42uHz (or better if possible) resolution, but something that you or others had mentioned a month ago made me  unsure about the 1-pps interface. Thank you for mentioning the SpecLab update and its performance with 1-pps synchronization.

 

73  Jim AA5BW