[Elecraft] Re: K3 Bias voltage
Hi all, I think we need to understand what is happening here. I am pretty sure I have this correct. The front panel socket is the same as the Kenwood one apart from the 8v being present on a different pin. However, this is a bit of a smokescreen as it actually has very little to do with bias voltage. The bias voltage as I see it drops a voltage onto pin 1 which will be the mic audio line. This has been done for speaker mics and handies for some time. So the bias voltage is nothing to do with where the 8v line is on the front panel socket. Unless your mic requires the 8v line which would only normally happen for desk mics (?) I do not see a problem. The vast majority of desk mics will have a blocking capacitor on the mic audio line. Do I have it correct? 73 Ian -- Ian J Maude, G0VGS SysOp GB7MBC DX Cluster Member RSGB, GQRP K2 #4044 |K3 #455 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Re: K3 Bias voltage
So the bias voltage is nothing to do with where the 8v line is on the front panel socket. Unless your mic requires the 8v line which would only normally happen for desk mics (?) I do not see a problem. The vast majority of desk mics will have a blocking capacitor on the mic audio line. Do I have it correct? Not quite. Kenwood, Yaesu and TenTec all require the +8V (+5V on pin 2 for Yaesu/Kenwood) line for electret mics. They do not put bias on the microphone audio line in order to prevent problems and potential damage with dynamic mics. Instead they install a R/C network inside any electret or preamplified microphone to add the voltage directly at the mic element or preamplifier. Dynamic mics typically do not include blocking capacitors in the mic line although some amateur mics will include a switch and .1 to .33 uF capacitor to provide a rising frequency response. 73, ... Joe, W4TV -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ian J Maude Sent: Thursday, May 01, 2008 10:57 AM To: Elecraft Reflector Subject: [Elecraft] Re: K3 Bias voltage Hi all, I think we need to understand what is happening here. I am pretty sure I have this correct. The front panel socket is the same as the Kenwood one apart from the 8v being present on a different pin. However, this is a bit of a smokescreen as it actually has very little to do with bias voltage. The bias voltage as I see it drops a voltage onto pin 1 which will be the mic audio line. This has been done for speaker mics and handies for some time. So the bias voltage is nothing to do with where the 8v line is on the front panel socket. Unless your mic requires the 8v line which would only normally happen for desk mics (?) I do not see a problem. The vast majority of desk mics will have a blocking capacitor on the mic audio line. Do I have it correct? 73 Ian -- Ian J Maude, G0VGS SysOp GB7MBC DX Cluster Member RSGB, GQRP K2 #4044 |K3 #455 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: K3 Bias voltage
I have almost come to the conclusion that no one really knows how to connect a microphone to a K3. There is even confusion about the Heil headset which Elecraft sells as being compatable with the K3. I have a kenwood MC-80 and it worked with no modification however it has an internal battery so I would probably need rewiring if it were not for the battery. Steve Ellington [EMAIL PROTECTED] - Original Message - From: Joe Subich, W4TV [EMAIL PROTECTED] To: 'Ian J Maude' [EMAIL PROTECTED]; 'Elecraft Reflector' elecraft@mailman.qth.net Sent: Thursday, May 01, 2008 11:26 AM Subject: RE: [Elecraft] Re: K3 Bias voltage So the bias voltage is nothing to do with where the 8v line is on the front panel socket. Unless your mic requires the 8v line which would only normally happen for desk mics (?) I do not see a problem. The vast majority of desk mics will have a blocking capacitor on the mic audio line. Do I have it correct? Not quite. Kenwood, Yaesu and TenTec all require the +8V (+5V on pin 2 for Yaesu/Kenwood) line for electret mics. They do not put bias on the microphone audio line in order to prevent problems and potential damage with dynamic mics. Instead they install a R/C network inside any electret or preamplified microphone to add the voltage directly at the mic element or preamplifier. Dynamic mics typically do not include blocking capacitors in the mic line although some amateur mics will include a switch and .1 to .33 uF capacitor to provide a rising frequency response. 73, ... Joe, W4TV -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ian J Maude Sent: Thursday, May 01, 2008 10:57 AM To: Elecraft Reflector Subject: [Elecraft] Re: K3 Bias voltage Hi all, I think we need to understand what is happening here. I am pretty sure I have this correct. The front panel socket is the same as the Kenwood one apart from the 8v being present on a different pin. However, this is a bit of a smokescreen as it actually has very little to do with bias voltage. The bias voltage as I see it drops a voltage onto pin 1 which will be the mic audio line. This has been done for speaker mics and handies for some time. So the bias voltage is nothing to do with where the 8v line is on the front panel socket. Unless your mic requires the 8v line which would only normally happen for desk mics (?) I do not see a problem. The vast majority of desk mics will have a blocking capacitor on the mic audio line. Do I have it correct? 73 Ian -- Ian J Maude, G0VGS SysOp GB7MBC DX Cluster Member RSGB, GQRP K2 #4044 |K3 #455 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.7/1409 - Release Date: 5/1/2008 8:39 AM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
