I am unable to find any info on the impedance of the Plantronics CS50.
I have often wanted to try a CS50, but I often use both receivers, one
in each ear and the SC50 is mono and only one ear. Good luck with your
efforts. You may just plug it in and give it a try, before you go
worrying if it will be a problem.
here are some links with info that may prove helpful...
from K3 Owner's man D10.pdf found here:
http://www.elecraft.com/manual/E740107%20K3%20Owner%27s%20man%20D10.pdf
===================
page 20
MIC (rear panel)
MONO; hi- or low-Z
This jack accommodates an electret or dynamic
mic. Use MAIN:MIC SEL to select the rear panel
mic (RP). Tap 1 to turn on Low or High mic gain
range. Tap 2 to turn bias on/off (see pg. 28 for
recommendations based on mic type).
For the front-panel mic only, additional microphone
gain can be enabled by tapping 3 . Use this only for
very low-output mics.
The mic’s PTT signal, if used, must be routed to
either the PTT IN jack or the PTT line on the ACC
connector (pg. 18).
====================
page 52
MIC SEL
Mic/line transmit audio source, mic gain range, and mic bias.
Source selections:
FP (front panel 8-pin MIC jack), RP (rear panel 3.5 mm MIC jack), and
LINE IN (rear-panel LINE IN jack).
Tap 1 to toggle between .Low and .High mic gain range for the selected mic.
]
Tap 2 to turn mic BIAS on/off (turn on for electric mics).
For the front-panel mic only, tap 3 to turn on an additional gain stage.
Use this only with very low-output mics. An apostrophe will appear after
the H, e.g. H’.
====================
====================
====================
from Elecraft K3 Schematics found here:
http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf
page 12 KIO3 Main, Sheet 2
page 13 KIO3: Audio IO Board
shows the rear mic inputs
====================
keep us informed of your progress Griff
--
GB & 73
K5OAI
Sam Morgan
On 3/4/2014 6:12 PM, N5AG wrote:
Has anyone wired up a Plantronics CS50 Telephone headset system to
the K3? The Plantronics CS50 system is composed of a base unit that
transmits and receives in full duplex to a small headset that is worn
and gives the capability to transmit and receive up to 300 feet. The
system uses 900 mhz to communicate between the base and the headset.
The base unit normally would plug in to a land line base telephone
using the standard four wire (two pair) found in most home telephone
installs. I need recommendations on wiring the Plantronics CS50 base
unit to the back panel mic and phone connections with the standard
four wire line from the Plantronics base.
Does the K3 have the ability via menu selection to match impedances
for the mic and audio hook up stated above or must the matching be
done in the interface between the Plantronics base and the K3?
Thanks for any help, Allen Griffith N5AG K3 #03547
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