GPSDO Tutorial?

[Chipp]

I purchased the Bodnar 2 port unit and want to add the external GPSDO to my Anan 7000 MKII (August 2022 version).

After reading this tutorial several times, especially the most recent posts I am unsure if I need to open the unit and check jumpers or just connect the Bodnar and check the "Using ext 10MHz ref" box in Setup/General Tab.

Any need to perform the Freq and Level calculations

73,

Chip

[w-u-2-o]

You should be able to just plug it in. It should just automatically start working. The board circuitry recognizes the presence of the external 10MHz and will switch. Software does not control this function.

You do not need to check the box in Setup > General > Calibration. That is there as a convenience feature to allow you to switch between two different correction factors. Just leave the main correction factor at 1.0.

If it does not work for some reason you may need to change the output drive level on the Bodnar. Only in rare cases do you need to go in and start moving jumpers.

[Chipp]

Got it.

Thanks Scott

[w9ac]

Chip,

With the 2-port Bonar unit, it's a good idea to ensure that the port you've designated as 10 MHz has the correct setup parameters. I've attached a print-screen of my setup menu which shows 10 MHz on port 1 and 48 kHz on port 2.

Paul, W9AC

[Chipp]

W6MY - GPS Setup.rtf

(2.2 MiB) Downloaded 1243 times

Paul,

Thanks for sharing your configuration parameters. I setup my unit to match yours. How are you using the 48K output?

Thanks Again,

[w9ac]

W6MY - GPS Setup.rtfPaul,

Thanks for sharing your configuration parameters. I setup my unit to match yours. How are you using the 48K output?

Thanks Again,

The 48 kHz output is used as a Word Clock generator to synchronize the data transfer between 48 kHz-sampled devices. Word Clock is a data synchronization format used to keep a perfectly timed and constant bit rate between all connected devices to avert data errors.

The same time base is used for both Bodnar outputs that eliminates constantly changing phase jitter between output ports.

Paul, W9AC

[w-u-2-o]

By "48 KHz sampled devices" I think Paul is referring to professional digital audio equipment. "Wordclock" is an audio industry term of art for sample clock.

I do the same thing. I have a Presonus Studio 192 Mobile professional USB audio interface that I use with VAC to run my radio. The Studio 192 is among the least expensive interfaces available with a wordclock input. It is no longer produced but continues to command a high price on eBay because of this feature. Other audio interfaces and equipment with wordclock inputs tend to very, very expensive.

[Chipp]

Thanks Paul and Scott for the setup info and helpful explanation of using the Bonar to enable "Wordclock" on an appropriately equipped interface. I currently do not use any external DAW but now know of an additional consideration should I go down that path.

[WT4DX]

Currently, what is the preferred GPSDO OCXO or TCXO on the market right now?

Applicable equipment: PreSonus Quantum 2, IC-7610, IC-9700, ANAN G2 on order.

73,
Tem
WT4DX

[w-u-2-o]

If you want to feed both the G2 and Presonus then pretty much your only choice is Bodnar dual output unit. Otherwise your best bet is BG7TBL derivative with a Russian OCXO off of eBay.

[WT4DX]

Would it be feasible to feed the PreSonus with the Bodnar mini, and feed the ANAN/ IC-7610 with a BG7TBL?

Tem
WT4DX

[w-u-2-o]

Would it be feasible to feed the PreSonus with the Bodnar mini, and feed the ANAN/ IC-7610 with a BG7TBL?

Yes. I do exactly that with my Presonus and 8000DLE because they are located in different areas of the house.

[WT4DX]

Square wave or sine wave, as well as 50 Ohm impedance?

Tem
WT4DX

[w-u-2-o]

It doesn't matter on the Presonus or Apache hardware. Can't speak to the Icom.

[W4WMT]

Are the PreSonus Quantum Series interface units the only ones now left from them that still offer Wordclock reference input?

[w-u-2-o]

Don't know. You'd have to check the Presonus website.

[WT4DX]

For those using the Leo Bodnar GPSDO are you running a 10 MHz bandpass filter to mitigate possible harmonics from the square wave, and If so what make and model of BPF?

73,
Tem
WT4DX

[W4WMT]

For those using the Leo Bodnar GPSDO are you running a 10 MHz bandpass filter to mitigate possible harmonics from the square wave, and If so what make and model of BPF?

Not using a BFP with my Bodnar GPSDO here. I'm using the dual output Bodnar with 10Mhz driving the Anan 7000 ref input and 48kHz driving the ASIO sound device (Lynx Studio AES16e) wordclock input. Both devices politely phase-lock themselves to the square wave fundamental without worries about harmonics.

73, Bryan W4WMT

[w-u-2-o]

There is no need for a BPF.

[WT4DX]

There is no need for a BPF.

Awesome!!!

73,
Tem
WT4DX

[WT4DX]

I'm going to run the dual output Leo Bodnar for the ANAN G-2, run a mini for my IC-7610, and a mini for the IC-9700. Would a splitter such as this be appropriate for using a single antenna between the three receivers?

https://www.instockwireless.com/gps-sig ... gps310.htm

https://advanced-rf.com/buy/50-ohm/gnss ... Hz/3SGPS1/

Or would it be a better option to run three separate antennas?

73,
Tem
WT4DX

[w-u-2-o]

Those will work. But it would probably be even better, and a LOT less expensive, if you simply split the 10MHz output of the first Bodnar unit using a 10MHz signal distribution amp.

You can find the BG7TBL distribution amp's on eBay for <$100. Example (for as long as the eBay link lasts).

Edited: fixed link above, and you want the one without the OCXO (cheaper!) since you merely need to split and buffer the output of your GPSDO.

[WT4DX]

That would make more sense for sure, and thank you for that recommendation.

73,
Tem
WT4DX

[WT4DX]

Those will work. But it would probably be even better, and a LOT less expensive, if you simply split the 10MHz output of the first Bodnar unit using a 10MHz signal distribution amp.

You can find the BG7TBL distribution amp's on eBay for $110 or so. Example (for as long as the eBay link lasts).

Any particular seller, and I want the one with the OCXO correct?

Thanks,
Tem
WT4DX

[w-u-2-o]

Oops, sorry. I should have chosen one without the OCXO

I've edited and fixed my post above.

[WT4DX]

Oops, sorry. I should have chosen one without the OCXO

I've edited and fixed my post above.

Thanks, and order in....

Tem
WT4DX

[WT4DX]

A fine point here, but what BNC/ SMA cables are you guys using with your GPSDO's (RG58, RG213, RG174, etc.)?

73,
Tem
WT4DX

[w-u-2-o]

Unless you are trying to transmit a signal more than 20 feet it doesn't really matter.

[PaulManc]

Negative.

Hi Scott - Can the same be said about the 8000DLE anything to do with the radio or 50ohm resistor on the output of the LBodnar unit?

Cheers

[w-u-2-o]

200D, 7000, 8000, Andromeda, and G2 all use the same 10MHz input circuit. You should have no problem.