Re: [IRCA] Testing the Alinco DX-R8 Receiver

[Vincent Ferme <dxista@xxxxxxxx>]

Hi Guy,

I don't have an DX-R8 receiver therefore I cannot comment on how the I/Q 
output was implemented. Strictly speaking, and based on Alinco's ad, the 
DX-R8 would qualify as an SDR front-end. Once the I/Q is fed into the 
computer, all settings are controlled by whatever SDR software is used 
(HDRadio, SD-Radio etc.). This appears to be the way the new Elecraft 
KX3 transceiver will do it also.

There are basically two ways to implement so called SDR receivers. The 
first is by providing I/Q from a typical receiver, as in the DX-R8T, or 
from a converter/front-end box, as in the popular SoftRock kits.  The 
second way is done by digitizing everything early on in the signal 
chain, like in the Perseus, Excalibur and etc.

Colin,

In your review, could check if when the radio is on I/Q mode whether the 
controls on the DX-R8 affect the I/Q output going into the computer. 
Second, while in I/Q mode, would you still have audio on the DX-R8 speaker.

Thanks in advance.

Regards,

Vince
DXWW-East Editor


"It's great to see this entry to the dwindling world of tabletop
communications receivers. However, by no stretch of the imagination could
this be called even a "part SDR" radio.

The DX-R8T has standard filtering and presumably AGC and modes taken care
of by hardware components, too. I might be wrong, but this appears to be a
traditional radio with easy provision for I/Q output. The circuitry in the
Alinco information describes the rig as a dual conversion superhetrodyne,
not an SDR."

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