[Milsurplus] ARR2

[jmfranke]

There is no local oscillator.  The IF is derived from modulating the 
transmitter.  The IF is the modulation tone of the transmitter. Think of it 
as a transmitter with HF modulation and the receiver as a tuned RF receiver 
followed by a detector tuned to the modulation frequency.  You tune the TRF 
to the carrier frequency and the IF to the modulation frequency.

John WA4WDL

----- Original Message ----- 
From: "WB6BLV" <wb6blv at inreach.com>
To: <Milsurplus at mailman.qth.net>
Sent: Saturday, September 16, 2006 9:05 PM
Subject: [Milsurplus] ARR2


> Bruce, thanks for that info.  From the schematic it appears that the
> ARR2 needs local oscillator injection to the mixer stage after the RF
> amp.  Was there by chance a separate unit that may have put the Rx
> on the same freq that was selected on the Tx?  I may be missing something
> but I see no local oscillator in the Rx schematic at all.
>
> John
> WB6BLV at irneach.com
>
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