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Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

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Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

Old 07-11-2005, 02:29 PM
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Default Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

Has anyone had any experience using the the 1833C or 1933C/NT radar with or without gryo inputs? I am curious how the target course and vector accuracy is affected while you perform a hard turn. I have had problems with some processors having inaccurate target speed and vectors with other systems and tracked it to an insufficient gryo update and baud rate. Also, if you are using a gyro input for true north heading, is it a real gyro with an AD-100 converter, or a PG-1000 magnetic flux gate? I would greatly appreciate any experiance anyone has had with any of this equipment. Thank you.
Old 07-11-2005, 03:31 PM
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Default RE: Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

Are you refering to the ARPA function?
The PG1000 puts out AD10, but the PG500 does also and it is rate stabilized. The stabilization should help with a target loss problem in tight, fast turns.

I have never seen a probelm under normal conditions. Unless you want to spend about $10K (plus maintenance) for a Gyro or about $4K for a satelite gyro, then the PG500 is your best bet.
Old 07-11-2005, 04:24 PM
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Default Re: Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

Thanks for the info, yes i was referring to ARPA. I am using the the 1933 for a backup radar, there is a gyro on the boat ,and i wish it were 10k, more like 10 times that. The primary radar has some accuracy issues which were resolved by changing the gyro update and baud rates, but I also need to send true north data to the 193C but I am trying to avoid using the ad-100 converter to the 1933C. Also, since there is a Gyro I may have other issues if I use the flux gate, I dont want the operators to see two different true north heading values depending on what display they look at.
How well do the PG-1000 and PG 500 work? They look like they are fairly rugged.

Have you ever used the 1933 or similar system without a heading input for true north correction? (other than GPS). If it is not needed for ARPA to function properly, there is already a gyro repeater on the bridge.

Thank you very much for your help.
Old 07-11-2005, 06:03 PM
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Default Re: Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

At $10K (actually $11,200) I was refering to the least expense true gyro I could think of.

GPS for heading is not going to cut it for ARPA. The update is too slow. I have seen it work well with NMEA data, but you need the high speed format of it.

What sort of Gyro is on the boat. Depending on make there night be a way to add an AD10 output. Also keep in mind that the PG500 only lists at $795 and I belive should be able to transmit in true with a GPS position input.
Old 07-11-2005, 06:34 PM
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Default Re: Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

the gryo is a Sperry mark 27, it only outputs serial data, the ad-100 converts that to a dc step, clock pulse format for the 1933C. The 1933 takes NMEA data at 10 Hz, 4800 Baud, and only uses it to display eading on the screen, does not use NMEA for ARPA, just AD-10. (Im a mechanical engineer working in an electrical world, so if any of my info is wrong, forgive me). I have been through the furuno manuals several times, but will have to look again tomorrow to see if there is anything I missed on this topic, I am in contact with Furuno in Seatlte, but most of the queries i give them get relayed to Japan, and take a week or two. The primary radar I am working with likes 25 Hz Gyro updates, and 34,800Baud, anything lower and the tracks were smeared. This is on a boat over 100ft in length, so i assume since the 1933 is made for boats that can turn much faster, it works fine. (the main sytsem is a furuno antenna with a PC based radar processor, not a furuno part)
thanks for the info craven, you have been a big help. I wish I found this site months ago.
Old 07-12-2005, 06:30 AM
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Default Re: Furuno 1933C/NT radar tracking, and Furuno PG-1000 fluxgate

Just a thought,
many of today's GPS gyro's have multiple outputs that might drive your repeaters as well as your the other equipment currently relying on a Gyro. And they meet IMO regs for a THD (transmitting heading device). The big plus is also no annual maintenance.

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