[Heathkit] SB-200 10M Power Output

[Carl]

Swapping tubes is certainly an easy place to start. We can dig deeper if 
needed.

Carl
KM1H



----- Original Message ----- 
From: "Tom Chesek" <tchesek at epix.net>
To: <heathkit at mailman.qth.net>
Sent: Wednesday, September 17, 2008 8:16 PM
Subject: Re: [Heathkit] SB-200 10M Power Output


> Carl,
>
> I've thought about the tubes and my thoughts are the same as yours, 
> but I do have an SB-201 that I can pull another tube set from to try. 
> As far as the MFJ...I see the same results on the FT-450 meter so I 
> didn't take it any farther. I could tweak the input on 15 Meters with 
> more drive but the 10 meter slug is stuck and I'm hesitant to try to 
> get it loose. Having said that I am open to all suggestions and am 
> willing to try them try them all.
>
> Thanks,
> Tom
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: "Tom Chesek" <tchesek at epix.net>; <heathkit at mailman.qth.net>
> Sent: Wednesday, September 17, 2008 7:58 PM
> Subject: Re: [Heathkit] SB-200 10M Power Output
>
>
>> "What am I  missing here?"
>>
>> Good tubes maybe. But I wouldnt expect that dramatic a drop between 
>> 20
>> and 15M.
>>
>> Start by putting the MFJ in a box in a dark closet. Then run the 
>> FT-450
>> at 30-50W and align the coils properly.
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Tom Chesek" <tchesek at epix.net>
>> To: <heathkit at mailman.qth.net>
>> Sent: Wednesday, September 17, 2008 5:41 PM
>> Subject: Re: [Heathkit] SB-200 10M Power Output
>>
>>
>>>I saw this message thread a few days ago and it got my interest. My
>>>SB-200 has full power out (550-600W) on 84/40/20 with 100W input but 
>>>on
>>>15/10 both will only do around 160W out with 100W in. I've made sure
>>>that all connections are tight. I've cleaned the bandswich and 
>>>verified
>>>that there is good wiping action on each contact. I've used my 
>>>MFJ-259B
>>>to check/set the SWR on the input coils with power on and the relay
>>>energized and have an swr of around 1.7 on 15 meters and 1.7 in the
>>>middle of the 10 meter band. These readings are confirmed by my Yaesu
>>>FT-450 built in SWR meter. What am I missing here?
>>>
>>> Tom K3TVC
>
>