Re: [Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

On 10/6/2017 4:27 PM, Richard Day wrote:

Why did you turn the mic bias off?  Have you tried turning it on to see if
it gives you the sound you need?


Bias for mics does not "improve the sound" of a mic. Rather, bias makes 
electret mics work (you'll get no sound from them without bias), and can 
cause problems with dynamic mics. At the very least, bias can cause 
distortion with dynamic mics, and at worst might damage them. This is 
NOT a topic for experimentation. If you want to know more, I suggest 
that you study how mics work.


73, Jim K9YC

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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Nr4c]

The Shire SM58 mic is a Dynamic mic and does not require bias (required only 
for electret mics). 

Sent from my iPhone
...nr4c. bill


> On Oct 6, 2017, at 7:27 PM, Richard Day  
> wrote:
> 
> Why did you turn the mic bias off?  Have you tried turning it on to see if
> it gives you the sound you need?
> 
> Rich
> KK4DZE
> 
>> On Fri, Oct 6, 2017 at 12:27 Joe Subich, W4TV  wrote:
>> 
>> 
>>> On 10/6/2017 11:36 AM, Jim Brown wrote:
>>> I'm with Bob on this. While the K3 and K3S DOES have a Pin One
>>> Problem at the rear panel mic input (the cable shield goes to the
>>> chassis through a capacitor), floating the cable shield is not a good
>>> solution, and it should be tied to the connector sleeve.
>> That may work with the K3/K3S which have a relatively low impedance
>> between the mic return and chassis.  Tying the shield to mic return
>> is a complete disaster on older rigs (FT-1000D, FT-1000MP, most Kenwood,
>> etc.) where the mic return is the emitter of the mic preamp which has
>> an *unbypassed* resistor and/or RF choke to DC return/chassis.  That
>> [relatively] high RF impedance is like connecting an antenna directly
>> to the mic.
>> 
>> 73,
>> 
>>... Joe, W4TV
>> 
>> 
>>> On 10/6/2017 11:36 AM, Jim Brown wrote:
>>> I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem
>>> at the rear panel mic input (the cable shield goes to the chassis
>>> through a capacitor), floating the cable shield is not a good solution,
>>> and it should be tied to the connector sleeve.
>>> 
>>> When a rig  DOES provide chassis at the mic connector, the balanced mic
>>> lines should be wired to MIC+ and MIC-, and the cable shield should be
>>> tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3
>>> together AT THE RIG and connect them to the chassis.
>>> 
>>> 73, Jim K9YC
>>> 

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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Fred Jensen]

Electret mics, and capacitor and carbon mics, neither of which are real 
common in hamdom these days, require a bias voltage in the 5-8 V range.  
A K3 will provide that bias if it's turned on in the MIC menus.  Dynamic 
mics do not require nor like bias.  Without bias, an electret mic will 
produce no output. I believe the Shure mic in this thread is a dynamic mic.


Carbon mic elements from old black telephones would run nicely on 1.5 V 
from a D-size dry cell although the telephone generally ran on 48 V from 
the central office.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 10/6/2017 4:27 PM, Richard Day wrote:

Why did you turn the mic bias off?  Have you tried turning it on to see if
it gives you the sound you need?

Rich
KK4DZE



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Don Wilhelm]

The SM58 microphone does not need bias.

73,
Don W3FPR

On 10/6/2017 7:27 PM, Richard Day wrote:

Why did you turn the mic bias off?  Have you tried turning it on to see if
it gives you the sound you need?

Rich
KK4DZE

On Fri, Oct 6, 2017 at 12:27 Joe Subich, W4TV  wrote:



On 10/6/2017 11:36 AM, Jim Brown wrote:

I'm with Bob on this. While the K3 and K3S DOES have a Pin One
Problem at the rear panel mic input (the cable shield goes to the
chassis through a capacitor), floating the cable shield is not a good
solution, and it should be tied to the connector sleeve.

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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

Mic bias is used only with electret microphones.  Dynamic (moving coil)
microphones like the SM58 can be damaged by DC on the coil!  The bias
will certainly *further reduce* the output from the already low output
of the dynamic mic.

73,

   ... Joe, W4TV


On 10/6/2017 7:27 PM, Richard Day wrote:

Why did you turn the mic bias off?  Have you tried turning it on to see if
it gives you the sound you need?

Rich
KK4DZE


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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Richard Day]

Why did you turn the mic bias off?  Have you tried turning it on to see if
it gives you the sound you need?

Rich
KK4DZE

On Fri, Oct 6, 2017 at 12:27 Joe Subich, W4TV  wrote:

>
> On 10/6/2017 11:36 AM, Jim Brown wrote:
> > I'm with Bob on this. While the K3 and K3S DOES have a Pin One
> > Problem at the rear panel mic input (the cable shield goes to the
> > chassis through a capacitor), floating the cable shield is not a good
> > solution, and it should be tied to the connector sleeve.
> That may work with the K3/K3S which have a relatively low impedance
> between the mic return and chassis.  Tying the shield to mic return
> is a complete disaster on older rigs (FT-1000D, FT-1000MP, most Kenwood,
> etc.) where the mic return is the emitter of the mic preamp which has
> an *unbypassed* resistor and/or RF choke to DC return/chassis.  That
> [relatively] high RF impedance is like connecting an antenna directly
> to the mic.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 10/6/2017 11:36 AM, Jim Brown wrote:
> > I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem
> > at the rear panel mic input (the cable shield goes to the chassis
> > through a capacitor), floating the cable shield is not a good solution,
> > and it should be tied to the connector sleeve.
> >
> > When a rig  DOES provide chassis at the mic connector, the balanced mic
> > lines should be wired to MIC+ and MIC-, and the cable shield should be
> > tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3
> > together AT THE RIG and connect them to the chassis.
> >
> > 73, Jim K9YC
> >
> > On 10/6/2017 5:50 AM, Joe Subich, W4TV wrote:
> >>
> >> > Pin #1 & #3 to ground
> >>
> >> Pins 1 and 3 should *never be tied together*.  If your transceiver has
> >> a balanced input *or* a *separate* case/chassis connection, connect
> >> pin 1 (shield/mic case) to the case/chassis connection (ideally to the
> >> *shell* of a Foster mic jack that is bolted securely to the metal case
> >> of the transceiver).
> >>
> >> If your transceiver does not have a separate case/chassis connection
> >> (the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
> >> (floating).
> >>
> >> 73,
> >>
> >>... Joe, W4TV
> >>
> >>
> >> On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
> >>> No preamp required.  Set the Mike gain via the menu to high. Easy to
> >>> wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground
> >>> and Pin #2 to MIC high. See page 55  of the manual [MIC SEL] for
> >>> details.
> >>>
> >>> If you close talk the mike it will be bottom end heavy. Typically no
> >>> closer than 4" will be OK.  Move in closer and the bottom end comes
> >>> up, back away and the bottom end falls off. This is due to the
> >>> proximity effect of they type dynamic mike.
> >>>
> >>> Otherwise, they sound quite good/.
> >>>
> >>> 73
> >>>
> >>> Bob, K4TAX
> >>>
> >>>
> >>> On 10/3/2017 1:50 PM, Stewart wrote:
>  Is anyone using a Shure SM58 mic with their K3s? If so are you using
>  a preamp? My O'scope shows that the mic and cable are good but level
>  is pretty low.
> 
>  I don't get anything with the mic connected to the rear mic jack.
>  Config is set to rp l , bias off. I tried mic gain from 0 - 100.
> 
>  K3s is new so I may be missing some menu item.
> 
>  Regards,
> 
>  Stew ke4yh
> 
> 
> 
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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

On 10/6/2017 11:36 AM, Jim Brown wrote:

I'm with Bob on this. While the K3 and K3S DOES have a Pin One
Problem at the rear panel mic input (the cable shield goes to the
chassis through a capacitor), floating the cable shield is not a good
solution, and it should be tied to the connector sleeve.

That may work with the K3/K3S which have a relatively low impedance
between the mic return and chassis.  Tying the shield to mic return
is a complete disaster on older rigs (FT-1000D, FT-1000MP, most Kenwood,
etc.) where the mic return is the emitter of the mic preamp which has
an *unbypassed* resistor and/or RF choke to DC return/chassis.  That
[relatively] high RF impedance is like connecting an antenna directly
to the mic.

73,

   ... Joe, W4TV


On 10/6/2017 11:36 AM, Jim Brown wrote:
I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem 
at the rear panel mic input (the cable shield goes to the chassis 
through a capacitor), floating the cable shield is not a good solution, 
and it should be tied to the connector sleeve.


When a rig  DOES provide chassis at the mic connector, the balanced mic 
lines should be wired to MIC+ and MIC-, and the cable shield should be 
tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3 
together AT THE RIG and connect them to the chassis.


73, Jim K9YC

On 10/6/2017 5:50 AM, Joe Subich, W4TV wrote:


> Pin #1 & #3 to ground

Pins 1 and 3 should *never be tied together*.  If your transceiver has
a balanced input *or* a *separate* case/chassis connection, connect
pin 1 (shield/mic case) to the case/chassis connection (ideally to the
*shell* of a Foster mic jack that is bolted securely to the metal case
of the transceiver).

If your transceiver does not have a separate case/chassis connection
(the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
(floating).

73,

   ... Joe, W4TV


On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
No preamp required.  Set the Mike gain via the menu to high. Easy to 
wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground 
and Pin #2 to MIC high. See page 55  of the manual [MIC SEL] for 
details.


If you close talk the mike it will be bottom end heavy. Typically no 
closer than 4" will be OK.  Move in closer and the bottom end comes 
up, back away and the bottom end falls off. This is due to the 
proximity effect of they type dynamic mike.


Otherwise, they sound quite good/.

73

Bob, K4TAX


On 10/3/2017 1:50 PM, Stewart wrote:
Is anyone using a Shure SM58 mic with their K3s? If so are you using 
a preamp? My O'scope shows that the mic and cable are good but level 
is pretty low.


I don't get anything with the mic connected to the rear mic jack. 
Config is set to rp l , bias off. I tried mic gain from 0 - 100.


K3s is new so I may be missing some menu item.

Regards,

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

I'm with Bob on this. While the K3 and K3S DOES have a Pin One Problem 
at the rear panel mic input (the cable shield goes to the chassis 
through a capacitor), floating the cable shield is not a good solution, 
and it should be tied to the connector sleeve.


When a rig  DOES provide chassis at the mic connector, the balanced mic 
lines should be wired to MIC+ and MIC-, and the cable shield should be 
tied to the chassis. In general, it's also OK to tie Pin 1 and Pin 3 
together AT THE RIG and connect them to the chassis.


73, Jim K9YC

On 10/6/2017 5:50 AM, Joe Subich, W4TV wrote:


> Pin #1 & #3 to ground

Pins 1 and 3 should *never be tied together*.  If your transceiver has
a balanced input *or* a *separate* case/chassis connection, connect
pin 1 (shield/mic case) to the case/chassis connection (ideally to the
*shell* of a Foster mic jack that is bolted securely to the metal case
of the transceiver).

If your transceiver does not have a separate case/chassis connection
(the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
(floating).

73,

   ... Joe, W4TV


On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
No preamp required.  Set the Mike gain via the menu to high. Easy to 
wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground 
and Pin #2 to MIC high. See page 55  of the manual [MIC SEL] for 
details.


If you close talk the mike it will be bottom end heavy. Typically no 
closer than 4" will be OK.  Move in closer and the bottom end comes 
up, back away and the bottom end falls off. This is due to the 
proximity effect of they type dynamic mike.


Otherwise, they sound quite good/.

73

Bob, K4TAX


On 10/3/2017 1:50 PM, Stewart wrote:
Is anyone using a Shure SM58 mic with their K3s? If so are you using 
a preamp? My O'scope shows that the mic and cable are good but level 
is pretty low.


I don't get anything with the mic connected to the rear mic jack. 
Config is set to rp l , bias off. I tried mic gain from 0 - 100.


K3s is new so I may be missing some menu item.

Regards,

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

It doesn't matter if the input is balanced or unbalanced.  The shield
and mic return should *never* be connected together.  The shield is
connected to the case of the microphone *not* a signal (mic -) line
and connecting shield to mic - simply adds common mode noise and hum
to the low level mic (-57 dBV) signal.

If you want to connect a 6 foot radial to the mic input of your rig,
be my guest, but don't suggest it to others due to the potential for
hum, RFI and other garbage.   The only case where the shield and
mic - is tied together for unbalanced inputs is where the mic (-)
is *properly* returned to the chassis *at the input* and that is not
the case with the K3/K3S *or any other transceiver that I know of*.

73,

   ... Joe, W4TV


On 10/6/2017 8:58 AM, Bob McGraw K4TAX wrote:

Joe.He is using the rear panel MIC input.  It is unbalanced.

Bob, K4TAX


Sent from my iPhone


On Oct 6, 2017, at 7:50 AM, Joe Subich, W4TV  wrote:



Pin #1 & #3 to ground


Pins 1 and 3 should *never be tied together*.  If your transceiver has
a balanced input *or* a *separate* case/chassis connection, connect
pin 1 (shield/mic case) to the case/chassis connection (ideally to the
*shell* of a Foster mic jack that is bolted securely to the metal case
of the transceiver).

If your transceiver does not have a separate case/chassis connection
(the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
(floating).

73,

   ... Joe, W4TV



On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
No preamp required.  Set the Mike gain via the menu to high. Easy to wire the mike 
XLR to an unbalanced circuit.   Pin #1 & #3 to ground and Pin #2 to MIC high.  
See page 55  of the manual [MIC SEL] for details.
If you close talk the mike it will be bottom end heavy. Typically no closer than 
4" will be OK.  Move in closer and the bottom end comes up, back away and the 
bottom end falls off. This is due to the proximity effect of they type dynamic mike.
Otherwise, they sound quite good/.
73
Bob, K4TAX

On 10/3/2017 1:50 PM, Stewart wrote:
Is anyone using a Shure SM58 mic with their K3s? If so are you using a preamp? 
My O'scope shows that the mic and cable are good but level is pretty low.

I don't get anything with the mic connected to the rear mic jack. Config is set 
to rp l , bias off. I tried mic gain from 0 - 100.

K3s is new so I may be missing some menu item.

Regards,

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Bob McGraw K4TAX]

Joe.He is using the rear panel MIC input.  It is unbalanced. 

Bob, K4TAX


Sent from my iPhone

> On Oct 6, 2017, at 7:50 AM, Joe Subich, W4TV  wrote:
> 
> 
> > Pin #1 & #3 to ground
> 
> Pins 1 and 3 should *never be tied together*.  If your transceiver has
> a balanced input *or* a *separate* case/chassis connection, connect
> pin 1 (shield/mic case) to the case/chassis connection (ideally to the
> *shell* of a Foster mic jack that is bolted securely to the metal case
> of the transceiver).
> 
> If your transceiver does not have a separate case/chassis connection
> (the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
> (floating).
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
>> On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
>> No preamp required.  Set the Mike gain via the menu to high. Easy to wire 
>> the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground and Pin #2 to 
>> MIC high.  See page 55  of the manual [MIC SEL] for details.
>> If you close talk the mike it will be bottom end heavy. Typically no closer 
>> than 4" will be OK.  Move in closer and the bottom end comes up, back away 
>> and the bottom end falls off. This is due to the proximity effect of they 
>> type dynamic mike.
>> Otherwise, they sound quite good/.
>> 73
>> Bob, K4TAX
>>> On 10/3/2017 1:50 PM, Stewart wrote:
>>> Is anyone using a Shure SM58 mic with their K3s? If so are you using a 
>>> preamp? My O'scope shows that the mic and cable are good but level is 
>>> pretty low.
>>> 
>>> I don't get anything with the mic connected to the rear mic jack. Config is 
>>> set to rp l , bias off. I tried mic gain from 0 - 100.
>>> 
>>> K3s is new so I may be missing some menu item.
>>> 
>>> Regards,
>>> 
>>> Stew ke4yh
>>> 
>>> 
>>> 
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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

> Pin #1 & #3 to ground

Pins 1 and 3 should *never be tied together*.  If your transceiver has
a balanced input *or* a *separate* case/chassis connection, connect
pin 1 (shield/mic case) to the case/chassis connection (ideally to the
*shell* of a Foster mic jack that is bolted securely to the metal case
of the transceiver).

If your transceiver does not have a separate case/chassis connection
(the K3/K3S rear mic jack *does not*) leave pin 1 disconnected
(floating).

73,

   ... Joe, W4TV


On 10/5/2017 9:30 PM, Bob McGraw K4TAX wrote:
No preamp required.  Set the Mike gain via the menu to high. Easy to 
wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground and 
Pin #2 to MIC high.  See page 55  of the manual [MIC SEL] for details.


If you close talk the mike it will be bottom end heavy. Typically no 
closer than 4" will be OK.  Move in closer and the bottom end comes up, 
back away and the bottom end falls off. This is due to the proximity 
effect of they type dynamic mike.


Otherwise, they sound quite good/.

73

Bob, K4TAX


On 10/3/2017 1:50 PM, Stewart wrote:
Is anyone using a Shure SM58 mic with their K3s? If so are you using a 
preamp? My O'scope shows that the mic and cable are good but level is 
pretty low.


I don't get anything with the mic connected to the rear mic jack. 
Config is set to rp l , bias off. I tried mic gain from 0 - 100.


K3s is new so I may be missing some menu item.

Regards,

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Bob McGraw K4TAX]

No transformer needed.  The gain settings on page 55 of the manual are 
sufficient for the SM 58.   Just wire it as an unbalanced output.   I 
use both the rear or front MIC inputs with no issues and a variety of 
different mikes.


73

Bob, K4TAX


On 10/4/2017 12:18 PM, Stewart wrote:


OK here's what worked: I used a pre-amp, that was on hand, that has a 
balanced XLR input and a TS jack output. The SM58 does need quite a 
bit of gain to work but sounds good using the tx monitor.
My SM58 has a switch so I set up to use VOX and the mic switch acts 
kind of like a PTT (only temp).
Amazon lists a Sescom AUD-XLR-RCA that seems to be nothing more than 
an audio transformer that converts balanced  to unbalanced. Might be 
just what is needed for higher output mics, such as some of the Heils.
Thanks for the help and I hope this helps others who want to use the 
rear jack on their K3s.

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Bob McGraw K4TAX]

No preamp required.  Set the Mike gain via the menu to high. Easy to 
wire the mike XLR to an unbalanced circuit.   Pin #1 & #3 to ground and 
Pin #2 to MIC high.  See page 55  of the manual [MIC SEL] for details.


If you close talk the mike it will be bottom end heavy. Typically no 
closer than 4" will be OK.  Move in closer and the bottom end comes up, 
back away and the bottom end falls off. This is due to the proximity 
effect of they type dynamic mike.


Otherwise, they sound quite good/.

73

Bob, K4TAX


On 10/3/2017 1:50 PM, Stewart wrote:
Is anyone using a Shure SM58 mic with their K3s? If so are you using a 
preamp? My O'scope shows that the mic and cable are good but level is 
pretty low.


I don't get anything with the mic connected to the rear mic jack. 
Config is set to rp l , bias off. I tried mic gain from 0 - 100.


K3s is new so I may be missing some menu item.

Regards,

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

On 10/4/2017 8:21 AM, Stewart wrote:
Any thoughts on this? 


Re-read my reply to you. It's all there.

73, Jim


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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Stewart]

And this works too, and much simpler.. Thanks Joe
73
Stew ke4yh

On 10/4/2017 1:58 PM, Joe Subich, W4TV wrote:


An XLR mic sound always be connected with Mic(+) to tip and Mic(-) to
the sleeve of the K3 rear panel mic jack.  A microphone (unless it is
a dual capsule M/S microphone) is always a mono device.  The K3 mic
inputs are *unbalanced* but any dynamic mic - including the "pro"
dynamic mics can be run unbalanced by connecting Mic(+) to tip and
Mic(-) to sleeve (mic return) and *leaving the shield floating*.

The Shure SM 58 is rated for -57.5 dBV/Pa that is only about 3 dB less
than most of the Heil dynamic mics and certainly within the capability
of the K3 with MENU:MIC SEL = rP.H and bias *OFF*.  No external preamp
required.

73,

   ... Joe, W4TV




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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Joe Subich, W4TV]

> I believe this is where my problem is. The rear mic jack is wired as
> mono (ring is not connected to anything) so it is an unbalanced input.
> Connecting the mic audio(-) to the shield might work.

An XLR mic sound always be connected with Mic(+) to tip and Mic(-) to
the sleeve of the K3 rear panel mic jack.  A microphone (unless it is
a dual capsule M/S microphone) is always a mono device.  The K3 mic
inputs are *unbalanced* but any dynamic mic - including the "pro"
dynamic mics can be run unbalanced by connecting Mic(+) to tip and
Mic(-) to sleeve (mic return) and *leaving the shield floating*.

The Shure SM 58 is rated for -57.5 dBV/Pa that is only about 3 dB less
than most of the Heil dynamic mics and certainly within the capability
of the K3 with MENU:MIC SEL = rP.H and bias *OFF*.  No external preamp
required.

73,

   ... Joe, W4TV


On 10/4/2017 11:21 AM, Stewart wrote:



On 10/3/2017 8:12 PM, Jim Brown wrote:


My guess is that the cable is not wired to mate with the K3. Study the 
pin-out in the K3S manual. From the balanced mic, connect one of the 
signal wires to Mic In, the other signal wire to Mic Return, and the 
cable shield to the chassis.


73, Jim K9YC


_

Hi Jim
I believe this is where my problem is. The rear mic jack is wired as 
mono (ring is not connected to anything) so it is an unbalanced input. 
Connecting the mic audio(-) to the shield might work. Or an audio 
transformer could be used to convert from balanced to unbalanced ie., 
audio +/- to primary and one leg of secondary to tip and other to 
sleeve. Any thoughts on this?
Others must be using the rear jack. How are they doing it? Contacted 
Heil and they don't have an adapter.
I am mainly a cw op and just don't want the clutter of a mic (or the 
wiring) on the desk.

Stew ke4yh


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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Stewart]

OK here's what worked: I used a pre-amp, that was on hand, that has a 
balanced XLR input and a TS jack output. The SM58 does need quite a bit 
of gain to work but sounds good using the tx monitor.
My SM58 has a switch so I set up to use VOX and the mic switch acts kind 
of like a PTT (only temp).
Amazon lists a Sescom AUD-XLR-RCA that seems to be nothing more than an 
audio transformer that converts balanced  to unbalanced. Might be just 
what is needed for higher output mics, such as some of the Heils.
Thanks for the help and I hope this helps others who want to use the 
rear jack on their K3s.

Stew ke4yh



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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Stewart]

On 10/3/2017 8:12 PM, Jim Brown wrote:


My guess is that the cable is not wired to mate with the K3. Study the 
pin-out in the K3S manual. From the balanced mic, connect one of the 
signal wires to Mic In, the other signal wire to Mic Return, and the 
cable shield to the chassis.


73, Jim K9YC


_

Hi Jim
I believe this is where my problem is. The rear mic jack is wired as 
mono (ring is not connected to anything) so it is an unbalanced input. 
Connecting the mic audio(-) to the shield might work. Or an audio 
transformer could be used to convert from balanced to unbalanced ie., 
audio +/- to primary and one leg of secondary to tip and other to 
sleeve. Any thoughts on this?
Others must be using the rear jack. How are they doing it? Contacted 
Heil and they don't have an adapter.
I am mainly a cw op and just don't want the clutter of a mic (or the 
wiring) on the desk.

Stew ke4yh


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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Jim Brown]

On 10/3/2017 11:50 AM, Stewart wrote:

Is anyone using a Shure SM58 mic with their K3s?


The SM58 is a poor choice for ham radio because of its bass boost. It 
should work if it's wired correctly, but it will be too bassy.


If so are you using a preamp? My O'scope shows that the mic and cable 
are good but level is pretty low.


No preamp is needed. Follow manual for menu setting for Mic Gain to High.



I don't get anything with the mic connected to the rear mic jack. 
Config is set to rp l , bias off. I tried mic gain from 0 - 100. 


My guess is that the cable is not wired to mate with the K3. Study the 
pin-out in the K3S manual. From the balanced mic, connect one of the 
signal wires to Mic In, the other signal wire to Mic Return, and the 
cable shield to the chassis.


73, Jim K9YC


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Re: [Elecraft] K3s rear mic connector and shure SM58.

[Nr4c]

Try RpH or even the super high setting. See manual for more details. 

Sent from my iPhone
...nr4c. bill


> On Oct 3, 2017, at 2:50 PM, Stewart  wrote:
> 
> Is anyone using a Shure SM58 mic with their K3s? If so are you using a 
> preamp? My O'scope shows that the mic and cable are good but level is pretty 
> low.
> 
> I don't get anything with the mic connected to the rear mic jack. Config is 
> set to rp l , bias off. I tried mic gain from 0 - 100.
> 
> K3s is new so I may be missing some menu item.
> 
> Regards,
> 
> Stew ke4yh
> 
> 
> 
> ---
> This email has been checked for viruses by AVG.
> http://www.avg.com
> 
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