[1000mp] Need a troubleshooting pointer

[Morris Wideman]

The reason for less power on any mode is duty cycle of the transmitter and power supply thereof. With AM, JT65, PSK31 to a less extent you are at a 100% duty cycle while transmitting it is like CW key down all the time. With something like SSB your output varies with voice vary seldom do you reach full power. You would exceed the heat and power dissapation limits of your finals and power supply by running 100W AM for long winded conversations. You can run 100W on CW and SSB because they are much lower duty cycle rate modes. Hope that helps 73 Morris WA4MIT



On Thursday, February 20, 2014 8:45 AM, WD8ARZ <wd8arz at comcast.net> wrote:
 
Would check out the band pass relays.

73 from Bill - WD8ARZ

On 2/20/2014 8:54 AM, Tom Frenaye wrote:
> One of my ft1000mp's developed a problem during last weekend's ARRL DX Contest and I'm looking for a pointer on where to start looking for the source of the problem.
>
> The symptoms are:
>
> 1) On 20 and 40 meters the transmit SWR is infinite when an antenna is connected.  It works fine on the other bands.  This is with the tuner off.
>
> 2). On receive, the signal levels on 20 and 40m are down 50db or more but fine on the other bands.
>
> I'm assuming it is not one of the band pass filters and not a pre-amp.
>
> Next step for me is to find a a magnifying glass for the schematic!
>
> Thanks for any pointers.
>
>      Tom/K1KI
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