My network analyzer test for the GPS antennae is approximate, of course, but nonetheless you can find out if the antenna is defective. Better to have a known good antenna handy to compare, when using this setup. I'm planning to build a frame (to hold the emitting antenna and the DUT) to find out if this test can give reliable results.
On Tue, Jul 31, 2012 at 2:29 AM, Didier Juges <shali...@gmail.com> wrote: > HP58532A > > The manual is on my web site > Www. KO4BB.com/Manuals > > The Bullet antenna specs are also on my site. > > Didier > > > Didier > > Steve <stev...@suddenlink.net> wrote: > > >Didier, > > > >What is the model number of the Symmetricom antenna? Do you happen to > >know the difference in gain between it and the Trimble Bullet antenna? > > > >Steve K8JQ > > > >On 7/30/2012 2:46 PM, Didier Juges wrote: > >> Chuck, > >> > >> I have one of the original red box TB. It came with the Trimble > >Bullet antenna that is specified in the TB datasheet. > >> > >> The antenna works but gives extremely poor results. The TB works > >much better with the Symmetricom antenna that is sometimes available on > >eBay. > >> > >> The Bullet antenna is usable with other GPS receivers, so I know it > >is not bad. Its just a poor match for the TB. > >> > >> Didier KO4BB > >> > >> > >> Chuck Harris <cfhar...@erols.com> wrote: > >> > >>> Ok, I'm getting a little puzzled. I have a TB that came from one of > >>> the early groups sold by John Ackermann and TVB as part of the TAPR > >>> buy. > >>> It works nicely, but like all TB's, it is deaf as a post, and needs > >a > >>> high gain antenna.... When I first got the TB, I tried it with a > >>> Motorola > >>> hockey puck antenna, with about 17db gain, and if it is outside in > >the > >>> clear, it works nicely... but LH shows the satellites signals are > >all > >>> down in the mud. > >>> > >>> ...So... > >>> > >>> I bought the active antenna that the TB data sheet said belonged > >with > >>> the TB, a 24045-10 bullet antenna, and *NO* satellites are visible.. > >>> the antenna is dead. > >>> > >>> I'm no stranger to getting cheated on things I buy, so I chalked it > >up > >>> to bad luck, and put my Motorola hockey puck antenna back on my TB. > >>> > >>> ...Then.... > >>> > >>> A couple of days ago another active antenna became available, a > >>> Micro Pulse 1934NW/C 50db antenna from a DATUM INC GPSDO. I checked > >>> its data sheet, and it powers off of +5V @ 38ma, so I bought it, > >>> hooked it up to my TB, and again *NO* satellites are visible... the > >>> antenna is dead. > >>> > >>> I put a "T" in the line, and the voltage heading up to the antenna > >is > >>> around +4.5V... The spec sheet says it will work down to +3V. > >>> > >>> Am I doing something wrong here? Or am I just unlucky? > >>> > >>> -Chuck Harris > >>> > >>> _______________________________________________ > >>> 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. > > -- > Sent from my Motorola Droid Razr phone with K-9 Mail. Please excuse my > brevity. > _______________________________________________ > 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.