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[aprssig] Mic muting

Scott Miller scott at opentrac.org
Mon Dec 18 02:38:42 UTC 2006


At least the Alinco DR-135T mutes the mic and speaker in data mode, but it's
not perfect - if the volume isn't all the way down, it pops a bit whenever
the squelch opens.  Also, it gets some crosstalk from the digital input on
the front panel.  I'm hoping those issues have been resolved in the Mk III.
For APRS-only operation, it's easy enough to work around them by installing
a blank 1/8" plug in the speaker jack.

So.. what's standard procedure for radios with no mic muting?  Does the TAPR
Mic-E provide muting?  Does anything else?

Scott
N1VG

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Ray McKnight
> Sent: Sunday, December 17, 2006 5:47 PM
> To: 'TAPR APRS Mailing List'
> Subject: RE: [aprssig] Mic muting
> 
> The Kenwood TM-V7A, once a top end radio(about 7 yrs ago)
> *does* have the data connector, but also does NOT mute
> the mic audio line when the TNC keys the radio.  Very
> frustrating and a stupid design flaw.  The radio also has
> a hot "audio in", as one side of the receiver will listen
> to the PLL tones on the 2nd side and cause the radio to
> do all sorts of unpredictable things, like change freq,
> etc.  For such an expensive radio, it seems little thought
> was put into these things.  I won't be buying another
> Kenwood in this lifetime.
> 
> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org]
> On Behalf Of Scott Miller
> Sent: Sunday, December 17, 2006 13:20
> To: 'TAPR APRS Mailing List'
> Subject: [aprssig] Mic muting
> 
> I very rarely work with mic encoder mode, and I just wired up 
> a TM-271A for
> some testing yesterday.  It worked fine, but I noticed that 
> the mic audio
> isn't muted when the PTT is released.  If there's too much 
> background noise
> it mangles the packet data.
> 
> I haven't seen any tracker circuits with a provision to 
> handle mic muting,
> but I don't have a TAPR Mic-E schematic available either.  
> Was it able to
> mute the mic?  Or is it not a problem with most radios?  Most 
> of my testing
> in the past has been with radios like the Kenwood TK-90, 
> where there's a
> separate accessory connector and the mic is muted when the 
> auxiliary PTT is
> used.
> 
> Scott
> N1VG
> 
> 
> 
> 
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