T-17_microphone_modernizing_1958.pdf

MODERNIZINGTHET17 byCHUCKSCHAUERS,W6QLV ForC hose not havlugthecash topurchase a goodcommercial mike for their mobile in- stallations, the widely available surplus T-I? microphonecan bemodified todoagoodjob. TheoutputoftheaverageTI?is lowand lacks voicequality. However.byreplacingthe transmittingunit(button)witheithera Western ElectricT-lorF-l unitorwithsimilar unitsmanufacturedbyStromberg-Carlson, AutomaticElectric,NorthElectric, etc., more outputwithbetterresponse and claritywillbe realized. If the F-Iunit (which is larger than the T-I) is used. the mouthpiece coverwill necessarily haveto be machined to take the larger unit. But with little work the T-Ican be made to titeithera metalorplastic T-17 without the needfor a latheorspecial tools. The photographsillustrate the conversion. 1-1.17microphone is firslcorefullydisassembled. 2-Wilhaknife,plaslicsurroundingcoverre- tainingscrewsiscarefullytoperedsothai T-ltransmitterunitwill fit flushwithtopof microphone (cose)cup.Afile is usedonthe metalmicrophoneforthesomepurpose. 3-T.ltransmIttingunitismountedinmicrophone cvpaftertwoconnectingwiresfromcvrlcord orecarefullysolderedtocenterbuttonand ovtsidering. Minimvmhea t should be usedfor thissoldering. 4-MicrophonecoverIIdrilledtoincreosepre. suresensitivity 5-Microphonei,reassembledanddesiredplvg attached.Most T-17microphonescontainwire connectiondiagramspastedinsideofbutton switch. September.1958C935