K3 Questions

[Joe Word]

1. How many volts is the mic bias?

2. Why does the filter selection always end in 5 (2.65, 2.75, 2.85 & etc)?

3. Can the Absolute S Meter function be set to ignore the RF Gain setting?



Thanks and 73,

Joe  N9VX

K3  #841
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[KK7P]

> 1. How many volts is the mic bias?

Rear Panel: 8V when BIAS is on.
Front Panel: 5V when BIAS is on.
Front Panel Mic Jack pin 6: 8V always on.

> 2. Why does the filter selection always end in 5 (2.65, 2.75, 2.85 & etc)?

The filter system is currently handled in 50 Hz steps.  Might change in a
future firmware rev.
 
> 3. Can the Absolute S Meter function be set to ignore the RF Gain setting?

It always takes the IF AGC control voltage into account.  Since that voltage
could be generated by a signal or the RF Gain control, the S Meter assumes it
is a signal and applies it to the calculation.

73,

Lyle KK7P
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[N4LQ-2]

Confusion still reins about the front panel mic. jack. The manual says pin 6
has 8v. This post says "5v when BIAS is on". So I measured it.
Front Panel Mic. Jack:
Pin 2 (PTT) has 5V no matter if BIAS is on or off.
Pin 6 has 8 V always on.

Steve Ellington
[hidden email]
----- Original Message -----
From: "lyle johnson" <[hidden email]>
To: "Joe Word" <[hidden email]>; <[hidden email]>
Sent: Thursday, May 15, 2008 10:55 AM
Subject: Re: [Elecraft] K3 Questions

>> 1. How many volts is the mic bias?
>
> Rear Panel: 8V when BIAS is on.
> Front Panel: 5V when BIAS is on.
> Front Panel Mic Jack pin 6: 8V always on.
>
>> 2. Why does the filter selection always end in 5 (2.65, 2.75, 2.85 &
>> etc)?
>
> The filter system is currently handled in 50 Hz steps.  Might change in a
> future firmware rev.
>
>> 3. Can the Absolute S Meter function be set to ignore the RF Gain
>> setting?
>
> It always takes the IF AGC control voltage into account.  Since that
> voltage
> could be generated by a signal or the RF Gain control, the S Meter assumes
> it
> is a signal and applies it to the calculation.
>
> 73,
>
> Lyle KK7P
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> 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: 8.0.100 / Virus Database: 269.23.16/1434 - Release Date: 5/15/2008
7:24 AM

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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

[KK7P]

> ... The manual says pin 6
>has 8v. This post says "5v when BIAS is on".

You may have misread my post, or I may not have been sufficiently clear.

Front panel Mic Jack Pin 1 (Mic Audio) has 5V if and only if BIAS is set on,
such as you might need for electret microphones.  Otherwise it has none, as
required for dynamic microphones.

>Front Panel Mic. Jack:
> Pin 2 (PTT) has 5V no matter if BIAS is on or off.

Yes, PTT has nothing to do with MIC BIAS.  This voltage is present so the
radio can tell when you ground the pin to signal that you wish to transmit.

> Pin 6 has 8 V always on.

>> Rear Panel: 8V when BIAS is on.
>> Front Panel: 5V when BIAS is on.
>> Front Panel Mic Jack pin 6: 8V always on.

We are in complete agreement.

73,

Lyle KK7P
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
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