zerotact Posted October 5, 2021 Report Posted October 5, 2021 (edited) Hiya guys, and ladies .. I had planned to pull the loran then just put a gps antenna in its place… but deeper reading, I should go ahead and put new rg400 cable in… then I find out I should keep my rg400 cable length under 9ft… Are most people just replacing the loran, placing the gps in the same hole? Or, moving the gps further up to get the rg400 cable run shorter? Edited October 6, 2021 by zerotact Quote
LANCECASPER Posted October 5, 2021 Report Posted October 5, 2021 Insects have antennae Airplanes have antennas. A GPS antenna can interfere with other antennas (including another GPS antenna). Go by what the installation manual tells you for location. If it's possible to re-use a hole, great. If not they can be plugged. 1 Quote
PT20J Posted October 6, 2021 Report Posted October 6, 2021 One thing to check is the footprint. Not all antennas use the same mounting hole pattern. 1 Quote
carusoam Posted October 6, 2021 Report Posted October 6, 2021 1 hour ago, zerotact said: Hiya guys, and ladies .. I had planned to pull the loran then just put a gps antennae in its place… but deeper reading, I should go ahead and put new rg400 cable in… then I find out I should keep my rg400 cable length under 9ft… Are most people just replacing the loran, placing the gps in the same hole? Or, moving the gps further up to get the rg400 cable run shorter? Hey ZT is in the MS Hoooouse! Only a few posts that occur near the end of the year…. +1 for following the directions exactly as outlined in the install manual… re-using stuff and misplacing stuff typically results in things not working very well… GPS signals are so tiny… they are easy to block accidentally… PP thoughts only…there are tons of examples of failed installs around here… ZT, what makes your posts so seasonal? Best regards, -a- Quote
zerotact Posted October 6, 2021 Author Report Posted October 6, 2021 Work gets crazy and I have to work on things in my downtime… I would have thought maybe some people with others that had factory loran would give input or post photos of where their Waas rated reciever is.. Quote
carusoam Posted October 6, 2021 Report Posted October 6, 2021 Loran was around for such a short period of time… My M20C had a Loran that went extinct soon after Y2K… To add complexity to the discussion… Loran was a ground based antenna system… And… GPS is celestial…. Planes today…. Have multiple GPS antennas with a growing need for more…. Some things get GPS when you least expect them to…. A simple ADSB-out system gets its own GPS signal to report out…. Some people have a pair of GPS/Nav/coms… Some people’s glass panels may know where they are without being attached to a nav com device… 9’ sounds like a long distance to get directly to the ceiling… Lets see… if you are buying an Avidyne nav/com… I know a guy we can ask this tech question directly to… + there is a sale on at Avidyne… For antenna questions… I would be remiss if I didn’t invite @Gagarin to stop by… Probably the first person I know to put RG400 in was possibly @Marauder… Stand by… see who stops in… Go MS! Best regards, -a- Quote
Bob Weber Posted October 6, 2021 Report Posted October 6, 2021 The Loran antennas I installed were on the belly of the aircraft, the GPS antennas I installed were on the top of the aircraft... Just sayin.. 2 Quote
Marauder Posted October 7, 2021 Report Posted October 7, 2021 Hiya guys, and ladies .. I had planned to pull the loran then just put a gps antenna in its place… but deeper reading, I should go ahead and put new rg400 cable in… then I find out I should keep my rg400 cable length under 9ft… Are most people just replacing the loran, placing the gps in the same hole? Or, moving the gps further up to get the rg400 cable run shorter? I replaced all of my wiring with RG400. Not sure where the 9 foot limit came from. Never heard there was a limitation. I know they recommend running RG 142 for lengths in excess of 15 feet. The 400 is stranded and the 142 is a solid wire. Even placing a GPS antennae over the passenger cabin will be close to exceeding if not exceeding 9 feet with all of the routing needed to get under the panel.If the mounting hole works size wise, you can reuse the hole. I definitely would use the RG400. Replacing all of the RG58 made a world of difference especially on the com radios. Sent from my iPad using Tapatalk Pro 3 Quote
StevenL757 Posted October 7, 2021 Report Posted October 7, 2021 On 10/5/2021 at 7:14 PM, zerotact said: Hiya guys, and ladies .. I had planned to pull the loran then just put a gps antenna in its place… but deeper reading, I should go ahead and put new rg400 cable in… then I find out I should keep my rg400 cable length under 9ft… Are most people just replacing the loran, placing the gps in the same hole? Or, moving the gps further up to get the rg400 cable run shorter? When running RG400 or RG142 (I prefer 142 simply because it bends a little bit easier), distance of the runs in the airplane doesn't matter, UNLESS you're using 400 or 142 to run transponder wire. In that case, you want the run as short as possible to eliminate possible noise and loss. As a sidebar, if you're doing any work where replacing cable runs is necessary, I'd take the opportunity to replace any and all RG58 with 400 or 142. The latter two are far superior over 58, and the costs are negligible in the grand scheme. 2 Quote
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