While they will both work, from everything I've been able to find, the
microphones are different, hence the reason the Yamaha has the battery
box for devices that don't offer phantom power required by the element
in the CM500.
from the K3 archives
http://elecraft.365791.n2.nabble.com/Koss-Headsets-for-the-K3-Was-Re-Yamaha-CM500-td7381976.html
Here is another option I found for less than $20 that specs out nearly
identical to the others mentioned here Shipping puts it nearly the same
cost as the Koss.
https://www.schooloutfitters.com/catalog/product_info/pfam_id/PFAM36725/products_id/PRO47806
On 6/9/2019 2:14 PM, n5xz via BVARC wrote:
I just checked the specifications for these headsets and they both
have Dynamic microphones, according to the online literature. The
CM500 is $60 and the SB40 is $30 and the only differences are that the
SB40 does not include the bias battery pack required by some rig, but
the Elecraft K3 does not require it and the SB40 does not have the
foam protector over the mic element. Other than that, they are
exactly the same. I will do some over the air tests someday.
Allen N5XZ
Sent from my Verizon, Samsung Galaxy smartphone
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