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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Zumo 660 w/ Starcom1
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<blockquote data-quote="Fred W" data-source="post: 911660" data-attributes="member: 3828"><p>Adding a follow-up and some closure to this thread for posterity:</p><p></p><p>Since nobody else knew anything about this issue, I went ahead and spent the money on a Starcom1 MIC-02 cable. When I plugged it in it worked exactly as advertised and disables the internal microphone in the Zumo unit.</p><p></p><p>Measuring the DC resistance shows only a small difference :</p><p></p><p>MIC-01 primary 88Ω / secondary 1590Ω</p><p></p><p>MIC-02 primary 90Ω / secondary 1575Ω</p><p></p><p>Apparently that relatively small change in resistance, no doubt due to changed number of turns in the audio isolation transformer, nets a significant enough change in audio reflected impedance to inhibit the internal mic. So, it would appear that anyone wanting to use the phone feature of the Zumo 660 with a Starcom1 will need to buy one of these new MIC-02 cables.</p></blockquote><p></p>
[QUOTE="Fred W, post: 911660, member: 3828"] Adding a follow-up and some closure to this thread for posterity: Since nobody else knew anything about this issue, I went ahead and spent the money on a Starcom1 MIC-02 cable. When I plugged it in it worked exactly as advertised and disables the internal microphone in the Zumo unit. Measuring the DC resistance shows only a small difference : MIC-01 primary 88Ω / secondary 1590Ω MIC-02 primary 90Ω / secondary 1575Ω Apparently that relatively small change in resistance, no doubt due to changed number of turns in the audio isolation transformer, nets a significant enough change in audio reflected impedance to inhibit the internal mic. So, it would appear that anyone wanting to use the phone feature of the Zumo 660 with a Starcom1 will need to buy one of these new MIC-02 cables. [/QUOTE]
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Zumo 660 w/ Starcom1
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