Author Topic: GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock  (Read 914 times)

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Offline W4PJBTopic starter

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GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock
« on: September 04, 2024, 02:30:29 pm »
I've been in the market for a GPSDO to use as an external clock and calibration tool for some RF test equipment. Last night I placed an order for a Leo Bodnar LBE-1420, partly based on some posts on this forum that seemed to give it high praises.

I looked at their "Precision GPS Reference Clock", but for $100 more, I couldn't really see any advantage, at least not based on the website descriptions. They're both 1x10-12 accuracy, both use TCXO's, both have 3.3v output for active antennas, both produce a 50 ohm, 3.3v CMOS level square wave output. But the 1420 has a larger frequency range and lower phase noise. No reference of the Allan Deviation for the 1420.

Other than adjustable output amplitude and ability to be powered by USB or a 5-12v adapter, what is the benefit of the "Precision GPS Reference Clock" over the LBE-1420?
 

Offline J-R

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Re: GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock
« Reply #1 on: September 04, 2024, 09:20:18 pm »
The LBE-1420 is a more recent release and essentially replaced the older single output product.  The "Precision GPS Reference Clock" is also an older version, but dual output, although the second output is limited in some ways.

The two older versions do have the four output drive currents available, while the new one doesn't have this feature.
 

Offline EvgenyG

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Re: GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock
« Reply #2 on: September 05, 2024, 12:18:13 am »
They've recently released command line tools to control the device, and there is an option to not save the set frequency. Can use that to automate some of the tests.
 

Offline W4PJBTopic starter

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Re: GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock
« Reply #3 on: September 05, 2024, 01:41:55 pm »
Thanks all! I don't know how I missed the Precision GPS Reference Clock having two outputs. I guess I was just scanning the description for numbers. I certainly don't need dual output.

The variable output levels could be helpful. The 1420 outputs 11dBm. I can't find specs for all of my equipment, but the maximum input on my 8566B, for example, is 10dBm. I've seen limits for some equipment as low as 0.8vpp so I think some attenuation is in order. I picked up a JFW step attenuator (0-30 in 1dBm steps) for $65, so that should cover any input requirement. Plus, now I own a nice step attenuator :)



 


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