[Heathkit] EV-638 / Heath HDP21A questions

[Ken Simpson, W8EK]

My data sheet on the HDP-21 A (note A suffix) says freq response of 70
Hz to 10 KHz.

The data sheet for the HDP-21 (plain, no A suffix) says 300 to 3000 Hz.

Both list Z at 100 K ohms.


73,

Ken, W8EK

Ken Simpson
E-mail to KenW8EK at hotpop.com or W8EK at arrl.net
Voice Phone  (352) 732-8400




> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net 
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of George KB2Z
> Sent: Sunday, November 14, 2004 11:22 AM
> To: heathkit-list
> Subject: [Heathkit] EV-638 / Heath HDP21A questions
> 
> 
> Gm all,
> EV-638 / Heath HDP21A
> Would anyone on the list have a Data Sheet for either mic?
> It seems to be common knowledge that they are the same, but 
> I'm confused.
> On the eham website the review of the EV-638 has the freq. 
> listed to 10kHz.
> On the Heathkit Matrix it lists the HDP-21A as only having a 
> response to 3kHz.
> Can someone in the know please help me out?
> Thanks in advance, George KB2Z
>