Re: IF frequency

On Mon, 30 Jan 2006 10:38:21 -0600, John Fields wrote:
> On Tue, 31 Jan 2006 01:53:43 +1100, "Phil Allison"
>>"John Fields"
>>'Phil Allison"
>>> Peter Bennett
>>>>>>
>>>>>>I think I would put it another way around: The designer of the radio
>>>>>>chose to use 29.05 MHz as the IF, and designed the IF amplifiers to
>>>>>>pass that frequency. The frequency that the receiver will receive is
>>>>>>that IF frequency plus (or minus) the local oscillator frequency.
>>>>>
>>>>> I think he stated it rather succinctly since the IF _is_ the
>>>>> difference between the carrier and the LO, regardless of the
>>>>> location, spectrally, of either the carrier or the LO.
>>>>
>>>>** That excludes those receivers where the IF is the sum of the
>>>>received carrier and the LO.
>>
>>** Try reading my post again.
>>
>> More carefully this time.

> To what end?
>
> It's obvious that you didn't understand the OP's post in the first place,
> obviously don't understand heterodyning, and are trying to become
> argumentative for the purpose of changing the direction of the discussion
> away from could only end in your having to admit your ignorance of the
> subject.
>
> I'll have none of it.

He seems to think that it's common, or done at all, for the LO to be
_added_ to the received frequency, resulting in an "IF" that's the _sum_
of the frequencies.

But, it is Phil Allison, after all.

Thanks,
RIch


.

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