David_Nelson
Well Known Member
Hi All,
I'm thinking of using the following placement. Before I make things "permanent", I just want to be sure I'm not shooting myself in the foot. I've a couple of concerns/questions with regards to the picture below:
- I'm told that navigation signals are horizontally polarized. I'm just not sure if I should orient the G/S antenna (the 16" of stripped coax) front-to-back, side-to-side, or if a 45deg angle is good enough? I suspect side-to-side is best but due to wing-tip width constraints, I was thinking 45deg would be a good compromise.
- Is it Ok to make a "J" with the J-Pole antenna? (would that make it J^2?). It's a little difficult to see, but it follows along aft edge of the wing tip.
- And finally, is it Ok to have the APRS (144.390 MHz) and G/S (329.15 to 335 MHz) this close to each other? I think it's Ok since the G/S frequencies are no where close to any harmonics of APRS. But I am little hesitant about the proximity of the tip to the APRS antenna.
The GPS "puck" is going to be glued to the upper portion of the tip fairly far forward (similar in location where the DB9 connectors are positioned). I also plan on shortening the APRS' GPS and power leads considerably. The other wing-tip has an Archer NAV antenna and I'd like to keep that separate from anything else.
Thank you,
I'm thinking of using the following placement. Before I make things "permanent", I just want to be sure I'm not shooting myself in the foot. I've a couple of concerns/questions with regards to the picture below:
- I'm told that navigation signals are horizontally polarized. I'm just not sure if I should orient the G/S antenna (the 16" of stripped coax) front-to-back, side-to-side, or if a 45deg angle is good enough? I suspect side-to-side is best but due to wing-tip width constraints, I was thinking 45deg would be a good compromise.
- Is it Ok to make a "J" with the J-Pole antenna? (would that make it J^2?). It's a little difficult to see, but it follows along aft edge of the wing tip.
- And finally, is it Ok to have the APRS (144.390 MHz) and G/S (329.15 to 335 MHz) this close to each other? I think it's Ok since the G/S frequencies are no where close to any harmonics of APRS. But I am little hesitant about the proximity of the tip to the APRS antenna.
The GPS "puck" is going to be glued to the upper portion of the tip fairly far forward (similar in location where the DB9 connectors are positioned). I also plan on shortening the APRS' GPS and power leads considerably. The other wing-tip has an Archer NAV antenna and I'd like to keep that separate from anything else.
Thank you,