Re: [time-nuts] Furuno GT-77 pinouts
On 04/11/2013 05:07 AM, Mark C. Stephens wrote: I searched far and wide and eventually found the pin-outs for the Furuno GT-77 GPS timing module. I believe the 16 Satellite, GT-80 timing GPS modules are the same pin-out. Pin1 is the closest pin to the antenna socket. 1. TXD 2. RXD 3. Ground 4. +5v 5. not specified. 6. 1PPS 7. Battery Backup Power 8. NC 9. NC It would be nice to have a manual for these Furuno receivers, with the commands, capabilities etc. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Connectors
Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Steve, Several of them smashed flat, stacked up, and jammed under a door make a low-quality door stop... Steve WB0DBS On Apr 11, 2013, at 11:10 AM, steve gunsel st...@sgteq.com wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
The quality varies a LOT. The good ones are the water proof ones they use outdoors. They are made to fit RG6 quad shielded cable and must be installed with a special tool. They are 75 ohm connectors. There are also many junk f-connectors used with rg58 and rg59. On Thu, Apr 11, 2013 at 9:10 AM, steve gunsel st...@sgteq.com wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
They're half decent 75 ohm connectors out to about a GHz if you do that. On Thu, Apr 11, 2013 at 10:10 AM, steve gunsel st...@sgteq.com wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
useful and I use them at hf for rcving antennas and such. The quality is all over the place but have used them up to 2 Ghz on occasion. Regards Paul WB8TSL On Thu, Apr 11, 2013 at 12:39 PM, Robert Darlington rdarling...@gmail.comwrote: They're half decent 75 ohm connectors out to about a GHz if you do that. On Thu, Apr 11, 2013 at 10:10 AM, steve gunsel st...@sgteq.com wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nuts https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Hi Steve: Many GPS receivers are designed with Type-F RF inputs in order to make use of the low cost TV coax. But even if a GPS receiver has a 50 Ohm RF input you can still use 75 Ohm feed line, see my low cost 4-way splitter: http://www.prc68.com/I/4GPS.shtml For most hobbyist use (nano second timing) this works very well, but if you're into pico second timing then it's a whole other ball game. Have Fun, Brooke Clarke, N6GCE http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html steve gunsel wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
The F connector makes up an extremely cheap connection for TV and satellite broadcast antenna cable. I use it even for my GPS antenna cable but I'd rather not recommend it when a stable and repeatable connection is needed. On Thu, Apr 11, 2013 at 6:10 PM, steve gunsel st...@sgteq.com wrote: Hi, Not too long ago there was an interesting discussion here about RF connectors. I have always wondered about the F connector - used by the boxload in TV distribution. Are they any good for anything else? Just curious. Thanks. Steve - N8MYA __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
On Thu, Apr 11, 2013 at 11:49 AM, Brooke Clarke bro...@pacific.net wrote: Hi Steve: Many GPS receivers are designed with Type-F RF inputs in order to make use of the low cost TV coax. But even if a GPS receiver has a 50 Ohm RF input you can still use 75 Ohm feed line, Yes they work but more than that. At least according to Trimble they are preferred connector type. The user manual that goes with my Trimble Thunderbolt (Version 5.0 Nov 03) says to use f-connectors and RG-59 for runs up to about 100 feet. The factory supplied kit from Trimble has 75 feet of this kind of wire. The thing to note is that while the above Trimble parts work OK for a GPS antenna it is not water proof and if left outdoors in the rain for a few years will fail. The better connectors are compression not crimp' The easy way to tell the difference is the compressor tool applies a force that is in parallel with the center conductor while a crimp tool applies the force at a 90 degree angle to the center conductor. Also while you can kind of fake it by using improvised tools to attach a crimp type connector you must have the right tool to attach a compression type. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Low-pass Filter for 5 and 10 MHz
A simple low pass filter to cut second and third harmonics from a 5 or 10 MHZ signal. See the paper: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano Timeok ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low-pass Filter for 5 and 10 MHz
Luciano, Thanks it gets saved in one of my folders. Pretty sure I will have a use for it. Regards Paul WB8TSL On Thu, Apr 11, 2013 at 12:42 PM, Luciano Paramithiotti timeok...@gmail.com wrote: A simple low pass filter to cut second and third harmonics from a 5 or 10 MHZ signal. See the paper: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano Timeok ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low-pass Filter for 5 and 10 MHz
Maybe a silly question but isnt the phase response of the filter important in this application ?? notches have fairly vicious phase shifts. Alan G3NYK - Original Message - From: Luciano Paramithiotti timeok...@gmail.com To: time-nuts@febo.com Sent: Thursday, April 11, 2013 5:42 PM Subject: [time-nuts] Low-pass Filter for 5 and 10 MHz A simple low pass filter to cut second and third harmonics from a 5 or 10 MHZ signal. See the paper: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano Timeok ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low-pass Filter for 5 and 10 MHz
Luciano Paramithiotti wrote: A simple low pass filter to cut second and third harmonics from a 5 or 10 MHZ signal. See the paper: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano Timeok It is easy to use filter software to design a filter like this, but how well it actually works is highly dependent on the quality of implementation. Suppression is a function of the Q of the resonators, the tuning tolerance, and possibly the tempco. Tuning tolerance gets into the issue of tuning granularity. In the 5071A, what I elected to do is design the filters to use off the shelf Coil Craft air core inductors and pairs of standard value capacitors in parallel (coarse and fine). The capacitor values were chosen to account for PC board parasitics. I lived with whatever suppression I could get under these constraints. I then designed a filter with multiple traps per frequency such that I could achieve 100+ dB suppression. This is not a minimum parts count design. These boards were automatically loaded with components off a tape and they simply worked when we turned them on. Every time. When it came to getting complaints from the production engineer, I was as lonely as the Maytag repairman. Nothing ever went wrong. Compare this to the finicky 5061 frequency multiplier. Filter software (at least what I have seen) doesn't do this type of design. Rick Karlquist N6RK (5071A RF designer) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Low-pass Filter for 5 and 10 MHz
Actually, the opposite is true. Notches have the least phase shift at the frequency being passed, which is what matters. It is true that the phase shift at the notch frequency is uncontrolled, but that is not important. The HP8662A had an interesting PLL synthesizer where they had 10 notch filters for the first 10 harmonics of the sampling frequencies. This minimized phase shift within the loop bandwidth that detracted from phase margin. I designers of the 8662 definitely know what they were doing. Rick Karlquist N6RK On 4/11/2013 5:02 PM, Alan Melia wrote: Maybe a silly question but isnt the phase response of the filter important in this application ?? notches have fairly vicious phase shifts. Alan G3NYK - Original Message - From: Luciano Paramithiotti timeok...@gmail.com To: time-nuts@febo.com Sent: Thursday, April 11, 2013 5:42 PM Subject: [time-nuts] Low-pass Filter for 5 and 10 MHz A simple low pass filter to cut second and third harmonics from a 5 or 10 MHZ signal. See the paper: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf Luciano Timeok ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Greetings, I have used the longitudinal compression F connectors for some time now with several GPS units and RG-6 cable. They certainly appear to be waterproof and quite sturdy. Not inexpensive but very serviceable. I found a kit with the installation tool and connectors and separate connectors at LOWES that does a nice job. I also found one for BNC that use the same principle but have not used it yet. Gordon WA4FJC ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
