lml@lancaironline.net Mailing List Archive

In a message dated 10/6/2006 10:17:35 P.M. Central Daylight Time, lsmith541@msn.com writes:

I have a glass ES with 2 Bob Archer com antenna, one in the baggage area fuselage side (SA-006), the other in the vert stab (SA-008). The SA-008 in the vert stab uses RG58 lead in coax, the other uses the newer RG400.

The problem is the SA-008 in the vert stab produces a weak signal as reported by the controllers. If I switch the antenna between com1 & com2 the problem moves with the antenna. This is not a new problem - it's been there since first flight.

Question for the antenna experts: Could this problem be caused solely be the higher impedance RG58 coax or is it likely there are other problems? This is a single piece of coax with not splices.

I'm vacillating between installing an external antenna on the belly or just changing out the coax on the vert stab antenna. I don't have an access panel in the vert stab but could install one if needed.

Suggestions/advice appreciated.

Leon,

If the fuselage antenna is working consider using a radio switcher (not a splitter) thru which both radios can use the same antenna for transmitting. Check any online avionics shop, like AeroCrafters.

Item#CI601

Dual Communication / Single Duplexer - Switching Antenna

Frequency • 118-136 MHz

Dual communication/single antenna duplexer designed to provide operation between two transceivers and one antenna. In the de-energized mode, the diplexer acts as a 3 dB coupler with the output ports isolated by 20 dB. Control voltage actuated by the microphone circuit switches the antenna to transmitter No. 1 or transmitter No. 2.

QTY EA @ $690.00

Scott Krueger AKA Grayhawk
LNC2 N92EX IO 320 SB 89/96

On Vacation