[ICOM] Tone squelch operation, "uniformed" question

[Dick Flanagan]

Thanks, Clete.  I like your answer better than mine.

Dick

--
Dick Flanagan K7VC
dick at k7vc.com


On 2/14/2012 6:11 AM, C.Whitaker wrote:
> de WB2CPN
> Good thoughts, Dick.
> A clearer picture is this.  Only A or B is transmitting at any one time,
> so it doesn't matter which one it is.  So that means the one that is
> not transmitting will hear whatever happens.
> Then, same for C and D.  Only one is transmitting at a time, so it
> doesn't matter which one is a source of interference.
> Let's keep C, and discard D.
> Now, if B is listening to A, and C starts a transmission, what B hears
> will depend on the relative strength of A and C, as heard by B, and
> the carrier frequencies of A and C.  If they are not synchronous,
> exactly,  what B hears will depend on all the factors Dick mentioned.
> FM is not like AM in receiving a signal.  AM will sum + and -, but
> FM won't do that.  Shades of higher math, such as FM sidebands.
> Who said "clearer"?
> 73  Clete
>
>
> On 2/14/2012 3:35 AM, Dick Flanagan wrote:
>> Yes.  In my experience the two encoded tones will mix and you will hear
>> the audio products (sum/difference) and the stronger of the four RF
>> carriers will capture the others.  Depending on the tone filtering and
>> other characteristics of the radios, the tonal grunge can be either
>> minimal or overwhelming.  It is one of those things that just has to be
>> tried as there are too many variables to give a definitive answer.
>>
>> Is this just an academic question or are you actually trying to create a
>> useful application?
>>
>> Dick
>>
>> --
>> Dick Flanagan K7VC
>> dick at k7vc.com
>>
>>
>> On 2/13/2012 11:25 PM, George J. Nixon Jr. wrote:
>>> Suppose that operators A and B have IC-W32a or equivalent ICOM VHF
>>> capable radios, and are having a QSO with  normal settings on a VHF
>>> simplex frequency.
>>> Suppose that operators C and D have similar rigs, get on the same VHF
>>> simplex frequency, and set the same subaudible transmit and receive
>>> tones.  When operators C and D start a QSO at the same time when A and
>>> B are in their QSO, will they hear (be QRMd) by the QSO of C and D?
>>> 73 - George, N9EJS
>>>
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
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