[Scan-DC] Motorboating on the Alexandria TRS

[Shawnerz]

Blair,
Like I said before, I'm pretty sure that's the 91 Hz
connect tone.  The tone at the end is a "signal" to
the receivers to mute.  That way there is no squelch
tail to the receiver that is expecting the "turn off
tone."
I'll have to poke around in the Motorola RSS.  There
are some confusing squelch/unsquelch/unmute/mute/And
unmute/And Unsqulech rules that can be established.
Perhaps someone else can explain them better.
-Shawn

--- b_thom@juno.com wrote:
> A few months ago, there was a discussion here
> regarding motorboating
> someone had heard while monitoring the Alexandria
> TRS. He might have had
> a PRO-2067, and he wondered if there was a problem
> with his scanner.
> 
> On Friday night, while driving around seeing if the
> citizens of
> Alexandria had thrown out anything good in their
> trash, I found a pair of
> Koss TD/65 headphones. I had to dig extra hard too,
> as the headband had
> become separated from the earpieces. Not only that,
> but it was raining. 
> 
> Today I tested them by plugging them into my
> recently purchased Bearcat
> SC-180B, which, unlike my other scanners, has a
> stereo headphone jack. I
> found that the headphones work perfectly well.
> Because the headphones
> have better bass response than the itty-bitty
> speaker in the SC-180B, I
> was able to hear for the first time the motorboating
> effect. It can be
> heard in the background during the voice part of the
> transmission. When
> the voice stops, the frequency of the motorboating
> increases to about
> three times what it had been. This final burst at
> the higher frequency 
> lasts for maybe a quarter-second before the
> transmission ceases entirely
> and the squelch tail is heard.
> 
> I haven't tried Arlington's TRS to see if the
> motorboating is there as
> well. As other listers wrote in at the time, the
> motorboating is part of
> the Alexandria system and is not indicative of any
> problem with the
> scanner.
> 
> HTH, as they say.
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