Help. My brain is stuck in "does not compute".
I am looking to confirm the optimal 915MHz distance from the moteino antenna pad to the point on the antenna where the poles diverge.
Here is what I have:
- Previous generation of dipole antenna from the moteino store (black pcb)
- Male pcb SMA soldered to the antenna
- 15cm rg316 male sma to female sma jumper cable:
https://www.ebay.com/itm/5PCS-15cm-RG316-Cable-SMA-Male-To-SMA-Female-Jack-Jump-Pigtail-6in-BS1/263266232496?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649The plan is to cut off the male sma from the jumper cable and solder that end directly to the moteino's antenna pad. I would then attach the male sma connector on the antenna to the female sma connector on the jumper cable.
I'm getting hung up on the optimal length from point A to point B.
The first page of this thread says:
915MHz = 10.80cm implies a 9.2cm pigtail
From the table for insulated copper wire in the Antenna Theory blog, the length reads:
915MHz 16.4cm 16.4 x 0.95 x 0.95 = 14.8cm
Should the distance be 10.80cm, 14.8cm, or some other distance? I am certainly misunderstanding something and could use a bump to get me back on track.