The coax is actually 50 feet of good quality 75 ohm cable that I bought for this (rated for satellite TV). I have not measured the loss accurately but I did check it at 2GHz when I bought it and it was good.
Didier Tom Knox <[email protected]> wrote: > >Hi; >Is your coax 50 or 75 ohm? Is it microwave rated? and have you tried >changing coax length? None of these should be a major factor but could >make a difference. >Best Wishes; >Thomas Knox > > > >> From: [email protected] >> Date: Mon, 30 Jul 2012 13:46:40 -0500 >> To: [email protected] >> Subject: Re: [time-nuts] Active antennas for a Thunderbolt... >> >> 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 <[email protected]> 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 -- [email protected] >> >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 -- [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. -- Sent from my Motorola Droid Razr phone with K-9 Mail. Please excuse my brevity. _______________________________________________ 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.
