Differences

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--- interfaces:fs1000a [2016/02/21 22:30]
darron
+++ interfaces:fs1000a [2016/03/23 19:55] (current)
darron
@@ Line 1: / Line 1: @@
-==== FS1000A ====
+==== FS1000A & RF-5V ====
 <wrap right>
 {{:interfaces:fs1000aX2.jpg?200}}
+\\ \\
+{{:interfaces:rf-5v.jpg?200}}
 \\ \\
 {{:interfaces:fs1000a.jpg?200}}
@@ Line 14: / Line 16: @@
 same plot we can see a faint signal from another device which is
 exactly 433.92 MHz.
-The 315 MHz transmitter is not legal where I live, however, due to
-the incompetence of one eBay seller I have one for testing.
 These devices work fine using 3V3 or 5V for VCC and the digital input named
-DATA or ADAT or ADAT upside down works equally well at 3V3 for 3V3 VCC
+DATA, ADAT or ATAD works equally well at 3V3 for 3V3 VCC
 or 5V VCC.
-The digital input floats at a around -0.8V when unconnected.
+To complement the FS1000A, the RF-5V (or equivalent) exists. This receiver
+module works okay at 3V3 for short distances but is rated for 5V operation
+which is needed for longer distances. It would appear
+that 5V is required to operate the AGC circuit on the board. The AGC can
+produce high levels of noise on the output when no signal is broadcast from
+the FS1000A.
+The second photo here shows the receiver. In this setup the output is
+fed into a cheap USB sound card whilst the FS1000A sends an AFSK signal.
+On the receiver host minimodem is used to decode the message reliably.