Re: [time-nuts] Furuno GT-77 pinouts

2013-04-11 Thread Magnus Danielson
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

[time-nuts] Connectors

2013-04-11 Thread steve gunsel
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 ___

Re: [time-nuts] Connectors

2013-04-11 Thread Steve
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

Re: [time-nuts] Connectors

2013-04-11 Thread Chris Albertson
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

Re: [time-nuts] Connectors

2013-04-11 Thread Robert Darlington
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

Re: [time-nuts] Connectors

2013-04-11 Thread paul swed
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

Re: [time-nuts] Connectors

2013-04-11 Thread Brooke Clarke
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

Re: [time-nuts] Connectors

2013-04-11 Thread Azelio Boriani
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,

Re: [time-nuts] Connectors

2013-04-11 Thread Chris Albertson
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

[time-nuts] Low-pass Filter for 5 and 10 MHz

2013-04-11 Thread Luciano Paramithiotti
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

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

2013-04-11 Thread paul swed
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

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

2013-04-11 Thread Alan Melia
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

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

2013-04-11 Thread Rick Karlquist
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

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

2013-04-11 Thread Richard (Rick) Karlquist
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

Re: [time-nuts] Connectors

2013-04-11 Thread Gordon Batey
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