Friday, March 21, 2008

Remote MIC and PTT switch for Mobile Rig

I have always wondered why there is no 'hands-free' kit for ham mobile rig... For the handy/portable, you would have the whole range from normal PTT to throat mic to bluetooth unit...

Typical for any mobile rig, you would need to bring the mic to your mouth and press the PTT to talk... I'm not sure what the law actually state, but I assume it's illegal to do this, since talking on the mobile phone without a hands-free kit is illegal here...

So I came up with 'look-like-hands-free' for our mobile rig... It's basically a simple opamp-based electret mic pre-amplifier with very minimal gain and the switch for PTT... The red button is the PTT button and a spare connection is provided near the RJ45 jack for additional trigger... The mic is a normal tie-clip electret mic... The wiring are done for my Kenwood TM-V708 mobile rig but it can be fitted to almost any rig... just need to identify the correct wiring to use...


So, with this unit, I would clip the microphone to my shirt or collar and the box will be somewhere near my center console... pressing the button will not be obvious anymore because it's no longer done within normal field of view... Here's the photo of my 'looks-like-hands-free' mic and PTT for the mobile rig.... :-)

Get the Schematic & PCB Files

8 comments:

KiloCycle Havoc said...

Thanks for the info's, and i very interesting to know it more.Can you provide me with the schematic and if not possible with the pcb drawing.Anyway, i do like your idea and your experience in electronic.My name is Mohd.Zaifful, and my ham radio callsign is 9w2mzy.Nice to meet you and nice blog you have with lot's of wonders idea. Thanks
Do visit my blog, kilocyclecore.blogspot.com.

Basir Atan said...

I have it... only thing is my work schedule very tight at present... kena cari dulu la bang...

KiloCycle Havoc said...

No problem at all, I do understand , it just hobby at all, by the way i very interesting about all the ideas you have made. Well hope to hear again from you soon. Terima Kasih Bang, Salam perkenalan, 73

Basir Atan said...

Link updated with the file requested.

M.Zaifful said...

Ok basir, due hard to find the component CLC449, do you know, where to get, or any replacement?

Basir Atan said...

Any low noise opamp can do the job...

M.Zaifful said...

Hmm, is it your pcb suit to use any low noise opamp, or must be modification a little bit, due to replacement CLC449. Thanks for the info's.

Basir Atan said...

Almost all dual opamp have a standard pinout... thus any dual opamp should work...