The first sentence was confusing, replace with: "I have tried several models, the original Trimble Bullet... "
Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Didier Juges > Sent: Sunday, September 14, 2008 9:02 AM > To: [EMAIL PROTECTED]; 'Discussion of precise time and > frequency measurement' > Subject: Re: [time-nuts] What outdoor antenna for Tbolt? > > I have tried three models the original Trimble Bullet, the HP > 58532A and several pucks, including a nice Trimble mag-mount > unit. Two of the pucks are designed for marine use, with a > decent waterproof case and mounting, but they are in an all > plastic case. There have no part number that I could see, I > need to look closer to see if there is a manufacturer's mark. > They were obtained on eBay from a long forgotten vendor... > > I am not sure how Trimble rates the mag-mount antenna, but it > probably was not designed for permanent outdoor installation, > even though it is heavy and looks very well made. > > They were compared by plugging them into my main Thunderbolt > receiver and checking the time to complete self-survey. > Because of the constantly changing constellation, it is > difficult to compare antennas otherwise over a short time. I > felt the self-survey was a useful indicator even though I am > perfectly aware it is just that. Self survey takes several > hours (2 to 8 in my experience, depending on the combination > of antenna and receiver). > > It seems my main Thunderbolt receiver (original OEM design > with built-in > supply) is more sensitive than the two Group-buy Thunderbolts > I also have, as it does complete self-survey faster and seems > to report more satellites, even though I have not yet > attempted to log that information over a period of time to > give an objective result. Another project for the winter.... > That could also be due to a different internal configuration > of the receivers, even though I have not seen any difference > in look-up angle settings and such. > > All antennas were compared while inside the house, in the > upstairs ham shack/office/lab, so pretty close under the > shingles covered roof and facing south. > > The Bullet I have is less sensitive than the others. I > receive fewer satellites with it and it takes much longer for > the self-survey to complete, I do not use it. I got it with > my main Thunderbolt receiver and it was not new when I got > it. All other antennas were bought new. > > The HP and the pucks seems to give about the same signal > strength and take about as long to complete the self survey. > The HP will go outside when I have a chance to install it, > it's still way too hot over here to do anything outside that > you don't HAVE to do... > > I bought the HP on eBay, new, for $50 with shipping, compared > to about $25 each for the pucks, including shipping costs. > Unless you are satisfied with an indoor antenna (in which > case I would say: "What are you doing on time-nuts?"), I > can't justify saving $25 by using a puck compared to the > wonderful piece of design and technology that the HP 58532A > is. By the pound, you get much more with the HP :-) > > Didier KO4BB > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of David Medin > > Sent: Saturday, September 13, 2008 3:28 PM > > To: [email protected] > > Subject: [time-nuts] What outdoor antenna for Tbolt? > > > > What outdoor bullet antenna are people using for their Tbolts > > (manufacturer and model number), where did you find it, > > and how much did you pay for it? I'm looking at several eBay > > antennas and the like crossing my fingers that the bias > > voltage and current will work, but I'd rather get some > > advice from those of you that have actually done > > the deed. I'm only really interested in antennas designed > > for permanent outdoor or marine installation. > > > > Thanks! > > > > Dave Medin > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, > go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
