external speaker volumn control for cdm-1250

[KitN1MCC]

sorry for all the silly questions

whats should i use. has any one else ever set anything like this up and is there a constant loud out put pins so i can bypass the control head volumn controld

[Tom in D.C.]

CDM1250 pinout for the 20-pin connector (from
http://www.batlabs.com):

Mobile Radio Accessory Connector Predetermined Functionality Pin Description Direction Comments
1 Speaker (-) Not Programmable
2 External Mic Audio Partially Programmable
3 Digital In #1 Input Only Fully Programmable, 12 Active Low Only
4 Digital In #2 Output Only Fully Programmable
5 Flat TX Audio Input Partially Programmable
6 Digital In/Out #3 Input Only Fully Programmable
7 Ground Not Programmable
8 Digital In/Out #4 Selectable Input/Output Fullt Programmable
9 Analog In #5 Special Input Fully Programmable, Tri-state Emergency Switch
10 Ignition Sense Special Input Not Programmable, Active High
11 Flat RX Audio Partially Programmable
12 Digital In/Out #7 Selectable Input/Output Fully Programmable
13 Switched Battery (+) Not Programmable
14 Digital In/Out #8 Selectable Input/Outpur Fully Programmable
15 RSSI (Radio Signal Strength Input) Not Programmable
16 Speaker (+) Not Programmable
17 BUS (+)* Not Programmable
18 Boot Control* Not Programmable
19 Unknown Not Programmable
20 Unknown Not Programmable

*These pins are used in conjunction with the flash adapter cable.

Regards,

[KitN1MCC]

ok more so what size pot should i use to control volumn to the external speaker

[Will]

ok more so what size pot should i use to control volumn to the external speaker

Most external speakers, that have a volume control, use a 20 ohm pot. SPKR hi from the radio goes to the 'top' of the pot, speaker to the center pin, and both the SPKR Lo from the radio and the other side of the speaker to the 'bottom' of the pot.

There are speaker pads that are constant impeadance used for volume controls at the speaker. 8 ohm speaker pad works for most two way stuff.