[Elecraft] Fwd: D 104

[Grant Youngman]

Sent from my iPhone

Begin forwarded message:

> From: Grant Youngman <nq5t at tx.rr.com>
> Date: June 4, 2011 3:12:03 PM CDT
> To: "jim at audiosystemsgroup.com" <jim at audiosystemsgroup.com>
> Subject: Re: [Elecraft] D 104
> 

> 10-15k is not high enough for good performance from a D-104 element.  It will sound like a squeaker at best, ir worse. 
> 
> Like I said. 500K MINIMUM.  5M better.
> 
> 
> 
> 
> Sent from my iPhone
> 
> On Jun 4, 2011, at 3:03 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> On 6/4/2011 12:16 PM, Grant Youngman wrote:
>>> That would be a COMPLETE AND TOTAL waste of time. The K3 mic input Z is 600 ohms nominal per spec.
>> 
>> Nominal is the operative word here. It's designed to have enough gain 
>> for the low impedance mics commonly used with ham gear. If you study the 
>> schematic, you see that the mic input stage of a K3 is NOT 600 ohms, 
>> it's an opamp, which is a fairly  high Z load. The input Z is at least 
>> 10K, probably more like 15K -- there's a 10K resistor in series with the 
>> input!
>> 
>>>