[hpsdr] Re Munin low output on 6m

[a.groff]

Kjell
    The wire is what was included in K3DLW kit.. insulation is 1.72 mm 
wire is 1.22 mm

    Enjoy your vacation..

AL, K0VM


On 11/22/2013 1:40 PM, Kjell Karlsen wrote:
> Hi Al.
>
> It seems as if the compensation of the output transformer might be 
> different with the type of wire you have used compared with what I 
> used. You may try to remove one of the capacitors and try again to see 
> if it is worse or better.
>
> Can you please measure the wire diameter and the outer diameter of the 
> insulation.
>
> I´ll test with the VNA when I come home next week. At the moment I am 
> in Spain for a short holiday.
>
> 73, Kjell
>
>
>
>
>
> På Fri, 22 Nov 2013 17:50:09 +0100, skrev a.groff <k0vm at mchsi.com>:
>
>> Kjell,
>>     Replacing the Capacitors and I can now get 115 watt at 50mhz and 
>> a bit more at 53mhz.
>>
>>     However, at 28mhz I can only get 90 watts and less at  30mhz .. ( 
>> a lot less at 42 mhz ).
>> It appears to start going into saturation at about 75 watt at 
>> 28mhz.   ( I had 100+w at 28 before replacing the capacitors.)
>>
>>    I think I shall try tightening up the turns on L4  (??? ) if your 
>> think that would help.
>>
>> AL, K0VM
>>
>>
>>
>>
>> On 11/16/2013 11:04 AM, a.groff wrote:
>>> Kjell,
>>>    I have the Caps on order and will report back..
>>>    If the problem is in the final output transformer shouldn't the 
>>> t1-2 source current increase as driver is increased above saturation ??
>>>    At 40watts output ( below saturation ) the drive required for 40 
>>> watts out is basically flat from 160m thru 6m.
>>>
>>> AL, K0VM
>>>
>>>
>>> On 11/16/2013 3:30 AM, Kjell Karlsen wrote:
>>>> Hi Al.
>>>>
>>>> I agree that the problem might be one of the capacitors. All my 
>>>> problems with low power on 6 meter has been with the output 
>>>> transformer and components around it.
>>>>
>>>> Please report back when you have tested with new capacitors.
>>>>
>>>> 73, Kjell
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> På Sat, 16 Nov 2013 00:33:28 +0100, skrev Bob Campbell 
>>>> <joan-bob at bigpond.net.au>:
>>>>
>>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>>
>>>>> Hi Al,
>>>>>
>>>>> Check caps C25 C26 C27 are all ok.
>>>>>
>>>>> Mine failed when I went to load it up on 6m, blew the cermic cap 
>>>>> apart.
>>>>>
>>>>> As Kjell suggested in a previous post replace these caps with four 
>>>>> 220pf
>>>>> 500vw 1206 caps.  Since doing this mine has been ok.  I suspect with
>>>>> this mod the current is shared evenly between all 4 caps and the 
>>>>> circuit
>>>>> is much more stable and I have no trouble getting the desired 
>>>>> output on
>>>>> 6m now.
>>>>>
>>>>> 73's
>>>>> Bob.c
>>>>> Vk4xv
>>>>>
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>>>>
>>>>
>>>
>>>
>>
>>
>
>


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