GPS Disciplined Oscillator

Cal N3CAL

I'm curious if anyone is using this type external GPSDO with their Flex 6000 series radios?   I've purchased one of these last fall on Ebay and have it running in the shack.  The plan is to feed the new 6600 once it arrives.  I've got the RS232 port hooked to my computer via USB and  running a program called NMEA Time which keeps my computer time updated and accurate. It's works great and runs in the background.  WSJT-x is always synced and decodes. 

 a few screen shots:






Cal/N3CAL

Burch - K4QXX

Yes, I use one of these on my Flex-6700.  I don't have the software installed so thanks for posting.  

Mike_W7TUS

I use a Thunderbolt GPS with my Flex 6500.  I only use the 10MHZ output of the GPS into the 6500 and it knocks the correction down from around 1500 ppb to around 60ppb.  The software that works well with it is Lady Heather but in my situation I don't use the software just the 10mhz signal into the 6500.  Very happy with it.
Mike W7TUS

WA2SQQ

I'm pretty sure that my friend Steve, K3WKM is running this one on his 6500.

Burch - K4QXX

Cal, does the RS232 port need a null modem/cable or just a normal serial cable?

Burch
K4QXX

Phil M0VSE

Yes I use that one and it works very well. I have his distribution amp that feeds all of my radios/transverters.

I also use it as a time source for Meinberg NTP.

Cal N3CAL

Burch,  I'm using a  DB9 male to  USB-A male cable to my computer for NMEA Time.   If you have a RS232 serial port on your computer it should be just a normal one.  When the 6600 arrives I plan on running the 10Mhz output (BNC) to the RCA 10Mhz RCA input on the back of the 6600.

Cal/N3CAL

WA2SQQ

Anyone have a link to this item on EBAY?

Phil M0VSE

There don't seem to be any for sale on Ebay at the moment. I got mine direct from BG7TBL on taobao.com but it you don't understand Chinese, it is certainly an experience (even with Google translate)

Bob K8RC

A caution if you are really a hair-splitter:

While the long-term frequency precision of a GPS-disciplined oscillator can be much better than the standard free-running oscillator, the phase noise can be MUCH higher. Since the external 10 mhz signal does not discipline the Flex's internal oscillator, it becomes the primary oscillator and can actually degrade the performance of the transceiver to a measurable extent.

This is especially true in the relatively inexpensive GPS-disciplined oscillators. A unit with low-noise output can cost as much or more than the transceiver.

73, Bob 

Tim - W4TME

https://community.flexradio.com/flexradio/topics/external-10-mhz-reference-phase-noise-requirements

Burch - K4QXX

Cal, I am having trouble finding this software.  Can you point me in the right direction? 

Burch
K4QXX

Cal N3CAL

Burch,  NMEA Time can be found here:  

http://www.visualgps.net/#nmeatime2-content

Cal/N3CAL

Ross - K9COX

Meinberg works for me

Burch - K4QXX

Thank you.

Jlawson40

Has anyone used the Leo Bodnar GPSDO with the 6000 series? John, W8AGS

Bob Brown - N8OB

I use this unit on my 6300.  I use a rubberduck antenna on the 10Mhz connector and then run the calibration procedure on 10Mhz.  It works very well.  I use this system for the FMT and usually do well on it also.  Mine is a couple of versions before yours but it checks out very well.
Bob - N8OB

Jlawson40

Thanks, Bob. I’m going to order one. It has pretty good reviews. John

SteveM

So to be a little more blunt than Tim, Bob's comment is not true.

For anything above a 20Hz bandwidth (i.e., negligible), Flex transceivers retain their own phase noise characteristics when using an external reference. Essentially, the external reference is only used for long term frequency accuracy.

Tom W3FRG

AC9S

Cal N3CAL

AC9S