[hpsdr] Microphone Impedance

[Tim ORourke]

Tnx Helmut
I am want to use some vintage Mic's for Scout Jamboree on the Air this year.
Heil mic's seem to be 600-1000 ohms, I use their headsets most of the time I am on SSB.
The older mic's Sure, Astatic and others sometimes have High Low switch, low being 200 -1000 ohms, high 10K or higher, one says 10k-10M!
Of course the real old ones are crystal but I will be trying some dynamic mic's that are in 1000 ohm range, looks like those should work.
Now to find some classic mic stands!
Tim 



Tim O'Rourke 
W4YN at ARRL.Net
Low Power Amateur Radio Rocks 
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
R/C Pilot (sort of) 
NRA Life Member
NRA Certified Rifle, Pistol, Black Powder Instructor, Range Officer 


-----Original Message-----
>From: Helmut <dc6ny at gmx.de>
>Sent: Oct 6, 2014 12:08 PM
>To: 'Tim O'Rourke' <w4yn at earthlink.net>, hpsdr at lists.openhpsdr.org
>Subject: AW: [hpsdr] Microphone Impedance
>
>Hi Tim,
>
>All HPSDR boards are using TI codec TLV320AIC23B. Typ. Input resistance is
>14 k ohms (min. 8 k ohms) and input capacitance 10 pF. An condenser/electret
>microphone is certainly a good choice.
>
>73, Helmut, DC6NY
>
>-----Ursprüngliche Nachricht-----
>Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Tim
>ORourke
>Gesendet: Montag, 6. Oktober 2014 17:32
>An: hpsdr at lists.openhpsdr.org
>Betreff: [hpsdr] Microphone Impedance
>
>***** High Performance Software Defined Radio Discussion List *****
>
>Anyone know ideal Mic impedance for Penelope/Hermes?
>
>Tim O'Rourke
>W4YN at ARRL.Net
>Low Power Amateur Radio Rocks
>Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member R/C Pilot (sort of)
>NRA Life Member NRA Certified Rifle, Pistol, Black Powder Instructor, Range
>Officer _______________________________________________
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