Search found 7 matches

by dalbert02
Thu Sep 21, 2006 6:17 pm
Forum: General Discussion
Topic: need some advice on replacing a transistor
Replies: 14
Views: 2731

Look into the newer RF transistors. [round with X shape leads] Four wire operation, one is ground, the other is positive, while 3 & 4 are DC in and RF out. Saves a lot of work. Would you happen to have any more info on these so that I may research them? Thanks! -dave PS Is it like this? http://rfpa...
by dalbert02
Thu Sep 21, 2006 6:14 pm
Forum: General Discussion
Topic: need some advice on replacing a transistor
Replies: 14
Views: 2731

Thank you Robert, et. al, The device is FM modulated. It is a Futaba 9CAP transmitter and a buddy with a coaxial dynamics watt meter measured the output at a little less then 100mW. Although I am fairly confident in my electrical skills for building kits and building/repairing power supplies, the RF...
by dalbert02
Thu Sep 21, 2006 2:09 pm
Forum: General Discussion
Topic: need some advice on replacing a transistor
Replies: 14
Views: 2731

"The current output is less then 100mW, I want to use the full 1W I am legally entitled to." Are you entitled? Just because Hams can use 1W in 6M band, doesn't mean an off the shelf unlicenced remote control transmiter can. Bands are divided into different services with different rules. Any Ham ope...
by dalbert02
Thu Sep 21, 2006 3:50 am
Forum: General Discussion
Topic: need some advice on replacing a transistor
Replies: 14
Views: 2731

This is in the 6m band, 50.860Mhz to be precise. The current output is less then 100mW, I want to use the full 1W I am legally entitled to. The car engine analogy works for me. I didn't realize the 'system' approach to it, but I understand now, thanks! I guess it is a bit more involved then I imagin...
by dalbert02
Wed Sep 20, 2006 8:26 am
Forum: General Discussion
Topic: need some advice on replacing a transistor
Replies: 14
Views: 2731

need some advice on replacing a transistor

I have a R/C transmitter that uses a 2SC2314 transistor. According to the ARRL handbook, I am allowed to transmitt with up to one watt of power on 6M. Would anyone have any advice on what transistor I should replace my current output transistor with? Here are the specs on the current transistor: htt...
by dalbert02
Thu Mar 23, 2006 7:28 am
Forum: General Discussion
Topic: need a 9v cut off switch, any ideas?
Replies: 9
Views: 1310

Re: need a 9v cut off switch, any ideas?

Thanks guys, I appreciate your fast and detailed response!
-dave
73
KI4HVT
by dalbert02
Tue Mar 21, 2006 11:56 am
Forum: General Discussion
Topic: need a 9v cut off switch, any ideas?
Replies: 9
Views: 1310

need a 9v cut off switch, any ideas?

Hi,
I need a circuit that will turn off if the battery reaches 9v. Specifically, I am using 3 lipo batteries to power video equipment and I don't want to over discharge my lipos. Any ideas? Thank you very much, your help is much appreciated.
-dave