What length antenna for 915 mhz?
Posted: Mon Jun 03, 2013 3:24 pm
My apologies if this is described elsewhere. I have googled and I have read, and I cannot find the answer.
I purchased a few jeenodes v5 and a jeelink v2 a few years ago, and then never got around to using them. I do not remember what frequency I ordered, it was too long ago.
Now I have them up and running, but I only get about 6 feet of range. They are both set to 915 Mhz as programmed with the default demo.
I googled "Jeenode red dot" and I got:
// red dots on radios are 915Mhz, green dots are 434 Mhz
The JeeNode modules have an antenna that is about 88 mm in length. The antenna on the JeeLink measures about 112 mm.
I found a reference that states:
82mm for 868Mhz and 78mm for 915Mhz
I am confused. If I have a red dot on the radio smd, what length should my antenna be? Why does my pre-assembled JeeLink have a 112 mm antenna?
Should I trim both of these down to 78 mm?
Thanks in advance!
I purchased a few jeenodes v5 and a jeelink v2 a few years ago, and then never got around to using them. I do not remember what frequency I ordered, it was too long ago.
Now I have them up and running, but I only get about 6 feet of range. They are both set to 915 Mhz as programmed with the default demo.
I googled "Jeenode red dot" and I got:
// red dots on radios are 915Mhz, green dots are 434 Mhz
The JeeNode modules have an antenna that is about 88 mm in length. The antenna on the JeeLink measures about 112 mm.
I found a reference that states:
82mm for 868Mhz and 78mm for 915Mhz
I am confused. If I have a red dot on the radio smd, what length should my antenna be? Why does my pre-assembled JeeLink have a 112 mm antenna?
Should I trim both of these down to 78 mm?
Thanks in advance!