Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-20 Thread Kevin Custer
Bryan Fields wrote: On Monday 19 December 2005 09:55 pm, Kevin Custer wrote: Yes it can... FM that is... Well the distortion I am seeing due to the final looks like AM, but then the vco has FM distortion when you tap the board so it's hard to tell. It's a combo of

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-20 Thread Jim B.
Kevin Custer wrote: Bryan Fields wrote: On Monday 19 December 2005 09:55 pm, Kevin Custer wrote: Yes it can... FM that is... Well the distortion I am seeing due to the final looks like AM, but then the vco has FM distortion when you tap the board so it's hard to tell.

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-19 Thread Ken Arck
At 03:55 PM 12/19/2005 -0600, you wrote: It looks like just a bad amp design as the transistor has the collector commen to the case, putting RF on the Heatsink. the heat sink seams to form a capacitor between it and the shield so any movement or heating modulates the signal. ---Modulates

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-19 Thread Bryan Fields
On Monday 19 December 2005 05:44 pm, Ken Arck wrote: ---Modulates it AM wise? Cause there ain't no way it could modulate the signal FM wise.. Yes AM wise, it varys the output Z which would make a AM signal. We see it on the service monitor when we tap/blow on it. -- Bryan Fields, KB9MCI

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-19 Thread Kevin Custer
Ken Arck wrote: At 03:55 PM 12/19/2005 -0600, you wrote: It looks like just a bad amp design as the transistor has the collector commen to the case, putting RF on the Heatsink. the heat sink seams to form a capacitor between it and the shield so any

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-19 Thread dalite01
- From: Bryan Fields [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, December 19, 2005 4:55 PM Subject: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics well I have a T301 on 220 that has some serious power drop off and microphonics issues. I had

Re: [Repeater-Builder] Hamtronics T301 220 exciter Final and microphonics

2005-12-19 Thread Bryan Fields
On Monday 19 December 2005 09:55 pm, Kevin Custer wrote: Yes it can...  FM that is... Well the distortion I am seeing due to the final looks like AM, but then the vco has FM distortion when you tap the board so it's hard to tell. It's a combo of both. How can the Final in this produce FM of