Fox Receiver 2m
Sam weeks ago
i found that the ARDF resources from G3ZOI was updated. URL fox description I like this design wary
good. So I ordered one bored and this arrived a few days later, PCB + 2
potentiometers, 3.5 mm jack for earphone and 2 Led, soldered and aligned. Order
a box from Elfa 10-431-36 Aluminium 115 x 64 x 30 mm
1550B. I won’t little different setup see picture, possible to operate
attenuator and pejel with one hand. Already use a old antenna. Fox Antenna Is made after
this info. Use Isolated SMA connector and can easy change antenna.
Testing
on Lab bench.
Current
13.6 mA.
Frequency
143,6 – 145,0 MHz
Input
RSSI pin 7.
-100
dBm 0,98V
-90 1,16
-80 1,40
-70 1.66
-60 1,84
-50 2,0
-40 2,23
-30 2,45
-26 2,5 max.
MinDetectebelSignal around -120dBm
To
turn on led1 red it needs maximum signal -30 dBm.
I
measure Led1 Vforward around 1.8V if I remember correct.
I
use one Elfa 75-036-76 it turns on 1,6V with the same current. Now Led1 turns
on earlier.
Practice
at home 3 Km away strong signals excellent reception.
Red
diode lightning 100 - 150m before Fox.
