VOR/LOC/GS antenna

[Carlos151]

Originally Posted by miyu1975

I was not aware the archer antenna worked for glideslope too...at least Stein website only list it as Vor/nav.

Works great for GS with my Garmin GNC255 NAV/COMM (same as the SL30). GS frequency is 4x the ILS/VOR frequency so its a perfect match. No need for additional antennas IF your NAV radio has an internal splitter like the Garmin. This way it breaks out the LOC and GS signals separately.

[BobTurner]

Originally Posted by Carlos151

Works great for GS with my Garmin GNC255 NAV/COMM (same as the SL30). GS frequency is 4x the ILS/VOR frequency so its a perfect match. No need for additional antennas IF your NAV radio has an internal splitter like the Garmin. This way it breaks out the LOC and GS signals separately.

GS is about 3x the LOC frequency. Resonant dipole (or quarter wave plus ground plane) antennas are also resonant at 3x, 5x, etc. the frequency. No need for a separate GS antenna. If your radio doesn?t have an internal splitter, add an external one.
I need to think some more, if the matching network is also proper at 3x the frequency. I think it is not ideal, but in practice works okay.

[Auburntsts]

Just for clarification, both the GTN 650/750 and SL 30 have internal diplexers so an external one to separate the Nav and GS signals apart is never required. However, if you have 2 NAV radios but only one Nav antenna (eg I have a GTN 650 and an SL 30 feed by a single RAMI AV-12L) you need a splitter (not a diplexer).

[GalinHdz]

For clarification on the difference between a diplexer and a splitter in our application (multi frequency input signal):

Splitter = Same input frequencies at both outputs, but at a lower input power.

Diplexer = One input frequency at one output port, different input frequency at the other output. Each output may be at "same" or lower input power. Don't confuse a diplexer with a duplexer, different animals.

[Kellym]

Originally Posted by rv7charlie

Yeah, you certainly wouldn't want to scrimp by flying ifr in an experimental a/c...

;-)

Yeah, went from 50 yr old Mooney with ADF and dual VHF navcoms with old six pack to Dynon Skyview with GTN650 and SL30.
Archer antenna in each wingtip, one for each navcom.
BTW, unless you have noisy old zenon strobes and other RF noise, RG-400 is overkill for VHF nav. RG-58 works fine and is only around 1/6th price of RG-400. RG-400 is needed for transponder and GPS because of their higher freq and other issues.

[BobTurner]

Originally Posted by Ed_Wischmeyer

If you?re building an airplane to fly IFR, be careful where you save pennies.

So, I see some people poking fun at Ed. But he does have a point. I have seen at least two unbelievably bad Archer installations that were actually flying around. If your system can?t receive VORs 40 miles away, do some trouble shooting and fix it. Probably goes for everything on an EAB but some owners seem to let these kinds of issues slide.

[GalinHdz]

O

Originally Posted by Ed_Wischmeyer

If you’re building an airplane to fly IFR, be careful where you save pennies.

^^^ This is 100% correct ^^^

Originally Posted by rv7charlie

Yeah, you certainly wouldn't want to scrimp by flying ifr in an experimental a/c...

;-)

^^^ This ^^^ is what I am poking fun at.

[rv7charlie]

Galin,

My comment was in response to the apparent context of the choice a particular antenna design being called 'pinching pennies' and it therefore being less worthy of trust. If we buy into that, should we also ask what percentage of IFR fliers on this forum use non-certified (almost invariably read cheaper, as in pinching pennies) primary and backup flight instruments?

Even the a/c itself should be questioned, if pinching pennies is the context. I can't imagine how much you'd have to spend to find a 2 seat certified plane with RV performance, but as expensive as a -10 can be, it's certainly pinching pennies compared to equivalent performance in a certified a/c.

Wouldn't it be more productive to suggest care in installation and workmanship, instead of referencing the dollars (or pennies) spent/saved? Especially when all three examples of pinched pennies have proven to be perfectly acceptable when executed properly.

Charlie

[Chris7]

Has anyone installed the wing tip antenna's with Zip Tips on an RV10? I'm planning on these tips and want to make a decision on wing tip or whiskers before I rivet the VS. I do plan to be IFR capable so need it to work well. Thanks