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Max Pro no power out
Posted: Mon Aug 18, 2003 9:44 pm
by oldaudio
Hello: my range is limited to 14/ to 1/2 mile with tuned commercial FM antenna and low loss coax ( Heliax ) . Very little power out . What gives ?
Have I fried my output stage ?
Thanks, Mike
Maybe
Posted: Tue Aug 19, 2003 1:33 pm
by pcs
Possibly, what have you done with it?
NO POWER OUT - MAX PRO
Posted: Tue Aug 19, 2003 6:03 pm
by OLDAUDIO
I AM USING A REGULATED B&K BENCH SUPPLY WITH VOLT & AMP METERS. VOLTAGE SET AT 14 , CURRENT DRAW IS APPROX 1.25 TO 1.5
AMPS. Antenna icon shows in the LCD window. Is this an indication of high SWR ? Intermittenly the antenna icon will disappear and the transmitter will make a buzzing sound. I disconnected all and brought the transmitter to my work bench. Powered it back up into a Bird dummy load thru a 43 wattmeter. No power out indicated. I then connected it directly into an IFR COM 120B service monitor. It indicated 22 mw power out.
Thinking I fried the output transistor, I replaced it with an ECG142.
Same results.
Is there a tune up instruction manual on the website ?
Thanks, Mike
Posted: Wed Aug 20, 2003 6:06 pm
by Guest
first, If you burned the output transistor, I think you should replace it with an ECG342 (C1971), not an ECG142.
Posted: Sun Sep 21, 2003 4:30 pm
by dcmicroradio
first, If you burned the output transistor, I think you should replace it with an ECG342 (C1971), not an ECG142
DITTO
