Bjorn, My setup is a Lucent 26 dB antenna on a bracket on the edge of the roof at the corner of my workshop feeding about 20 feet of 9913 coax (7.5 dB attenuation per 100 feet @ 2.4 GHz) to a 58536A four way splitter that feeds a Z3816A, Z3805A, TBolt, with a 'spare' for playing with. The splitter uses about 2 feet of 9913 to the Z3816A and the Z3805A and the TBolt is fed with about 6 feet of RG58 with BNC connectors and adapters for BNC to F and BNC to N.
With SatStat and a Z3816A, C/N is typically 30 to 50. With TBoltMon or Lady Heather and a TBolt, dBc also typically 30 to 50. I didn't see much difference on either with switching antennas but I suspect I have a fair amount of signal to start with (Lat of 30 degrees but under trees). Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, April 14, 2012 5:52 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lucent 40 dB Antenna Hi Joe, 40dB is not needed when you have a short (<10m) /good antenna cable. Then 26dB will be plenty fine. Howver going to 20 or 30+ meters using standard RG58 will be a problem with 26dB. Ofcause what matters is the attenuation at L1 with your cable. Better cable can be longer... You do not need an spectrum/network analyzer. Take a your antenna and receiver to a good site, if you installation site might be marginal. Your C/N0 (snr) should be around or above 50dBHz for high elevation satellites. Then compare the C/N0 values for you antenna at your workshop, to see how much worse than "perfect" that site is. If using a Tbolt remember to change from Trimble AMU into dBHz. Note that LNA dB amplification not generally translate direcly into dB carrier to noise ratio. -- Björn PS I got a small batch of HP timing antennas new in box for around $25 a piece some years ago... :-) DS > Mine arrived in the same manner. It works but I can't tell any real > difference between it and my 26 dB antenna, switching between them when > mounted on the corner of the roof of my workshop. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Steve Krull > Sent: Friday, April 13, 2012 1:40 PM > To: [email protected] > Subject: Re: [time-nuts] Lucent 40 dB Antenna > > Just got mine, from "Just_for_survive" on eBay. Poorest packing job I've > ever seen for an international package. Three wraps of newsprint and a > thin padded envelope. I'll know this weekend if its operational. > > Steve > > > > On Tue, Apr 10, 2012 at 11:14 PM, Chuck Forsberg WA7KGX N2469R wrote: > >> My Lucent antenna arrived today. I scrounged some adapters >> and connected it to my Thunderbolt. Two birds were visible >> with AMU > 4 when I held the antenna. My Droid 3 could not >> see any birds through the wet roof. >> >> The unit has some dings and scrapes but no visible corrosion. >> >> I am tempted to take it apart but don't wish to break a unit >> which seems to be working well. >> >> Has anyone compared this antenna with the mushroom that >> came from China with the used Thunderbolts??? >> >> -- >> Chuck Forsberg WA7KGX N2469R [email protected] www.omen.com >> Developer of Industrial ZMODEM(Tm) for Embedded Applications >> Omen Technology Inc "The High Reliability Software" >> 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 >> >> >> _______________________________________________ >> 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. > > > _______________________________________________ > 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. _______________________________________________ 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.
