Thanks to everyone who 'chimed-in' to help
I managed to resolve MY problem which was related to my RS232 to USB interface cable
Long story short - it simply was not receiving the data correctly - and as a result - erroneous data prevented LH to identify the GPS receiver in the GPSDO - and subsequently not being able to function.
With a new AND WORKING cable - all is fine - I just had to specify the comport via /4 command (my device was on com4) LH fires up with NEMA receiver detected.
Is there a way to monitor the OCXO frequency drift of the GSPDO with respect to the received GPS reference with LH?
Not sure if this is possible with a NEMA receiver LH configuration.
Any feedback on this once again is most welcome.
Now I have another interesting problem.I ordered a few more additional BG7TBL devices and received them today.
1. 10MHz OCXO frequency standard distribution amplifier 2019-09-13
2. FA-2 Precision Frequency counter
3. WB-SG1 Wideband Signal Generator (8GHz)
So I am about to enter even a bigger rabbit hole and might need more help from all of you who visit this thread.
First QuestionThe 10MHz OCXO distribution amplifier
- does anyone have a user manual?
I am puzzled by the RED led on the front which is labeled ALM
I can only assume this is similar to the ALM LED on the GPSDO ??
The operation of this - is to signal when the OCXO has stabilized or been conditioned by the GPS
When you switch-on the GPSDO for first time - the RED LED ALM is 'on' and this stays on for about 10 minutes - then it goes off (as expected)
On the 10MHz OCXO distribution amplifier - when powered-on the ALM LED is 'off' and it stays off no matter what happens.
Is this normal behavior?
Does it only go 'on' when there is some kind of failure ONLY??
Any input on this will be most welcome.
Second QuestionThe FA-2 Precision Frequency counter is capable of 11 digit resolution.
It has an external 10MHz reference
I presume (have not opened it up as yet) it has its own OCXO inside for the internal clock.
So any Frequency measurements it performs will be in relation to its internal clock
How can we then 'trust' the 11 digit resolution?
Is there some algorithmic technique used to get extra precision and not tied directly to the clock?
My concern is if I connect the GSPDO 10MHz reference to it - it will then report the GPSDO 10MHz frequency as 'perfect' because its using this as a refrence - I guess this is expected behavior.
So as I suspect - I WILL NOT be able to use the FA-2 to measure the GPSDO frequency deviation from true 10MHz
BUT
I will be able to measure ANYTHING else in reference to the assumed perfect 10MHz GPSDO clock.
Which is as expected - you cannot use yourself as a reference to check yourself ... you know what I mean (I hope).
Also, if someone knows of user manual - I am particular interested as to how to 'switch' on or off the LPF (displayed on front LCD display) - it is not responsive to any button sequences I tried. I assume you will be able to 'switch-on' the Low Pass Filter Function - not sure as to how this it to be applied and to what effect - presumably to 'clean-up' the signal where appropriate.I found an existing thread on this device ...
https://www.eevblog.com/forum/metrology/bg7tbl-fa1-frequency-analyzer/I guess I missed it the first time around
Third QuestionHas anyone got the WB-SG1 Wideband Signal Generator (8GHz)?
If you do have it - have you got any 'tips' / suggestions / comments??
Thank you everyone - hope you find this post useful - please ask if you want me to do any testing