[Amps] Recommended Tuner for Clipperton L

[Carl]

I believe all the Murch 2000 family use roller inductors.
The B model added 160, a bypass switch and a directional coupler but the 
schematic does not list any values. The A model covered 80-10M with 200pf 
caps and a 18uH rotary inductor.
Since the cabinets were the same I dont see using higher capacity caps at 
the A spacings if they were changed at all.

Carl
KM1H





Carl
KM1H



----- Original Message ----- 
From: "Richard Solomon" <dickw1ksz at gmail.com>
To: <amps at contesting.com>
Sent: Sunday, February 02, 2014 4:56 PM
Subject: Re: [Amps] Recommended Tuner for Clipperton L


> One of the often overlooked Tuners are the Murch UT-1000 and UT-2000.
>
> They have not been made in many years and sell for much less than their
> more modern (and expensive) counterparts.
>
> The UT-2000B will cover 160 - 10 and will load up the proverbial 
> bedspring.
>
> They show up over on the "evil empire" from time to time.
>
> 73, Dick, W1KSZ
>
>
> On Sun, Feb 2, 2014 at 2:37 PM, Roger (K8RI) <k8ri at rogerhalstead.com> 
> wrote:
>
>> On 2/2/2014 2:11 PM, qrv at kd4e.com wrote:
>>
>>> Weird amps list error the first try - trying again ...
>>>
>>>  Roger,
>>>>
>>>>      Would you please explain "hiss"?
>>>>
>>>
>> iss as in hi voltage arc.  Sounds just like a cat or snake.
>>
>>
>>>>      What, precisely, is happening to create that sound?
>>>>
>>>
>> If the antenna in highly reactive (inductive) and the SWR is high the
>> voltage goes high.
>> Neither the MFJs or Dentrons had a high enough voltage rating for much
>> over what I'd get when the 160 antenna was resonant near the DX window 
>> and
>> I'd go to the top of the band.
>>
>> Moving the resonant point to the middle, or upper end of the band would
>> eliminate the arcing at 1 KW, but then I had concerns about the small 
>> wire
>> on the rotary inductor when operating at the bottom end of the band.
>>
>> They really needed a higher voltage rating on a larger cap and a larger
>> size wire on the rotary inductor for current on low impedances.
>>
>> 73
>>
>> Roger (K8RI)
>>
>>
>>>>      There are so few parts involved it seems that there's
>>>> either too small inductance (or perhaps the gauge of the coil
>>>> wire is undersized), too little capacitance (or perhaps aging
>>>> doorknob capacitors), or a tiny arc across an under-rated switch?
>>>>
>>>>      Could it be that a small tweak to one part of the mix of
>>>> parts could compensate for the weakness elsewhere e.g. adding
>>>> capacitance balances the added stress at 160m such that the
>>>> marginal coil or switch is not pressed to the limit?
>>>>
>>>>      Trying to understand the "why" behind the symptoms ...
>>>>
>>>> Thanks!
>>>>
>>>> David
>>>>
>>>>  I've had no problems with the half sloper, center fed droopy dipole
>>>>> on 160, or the Fan Dipole on 75.  The Dentrons and MFJ 989 series
>>>>> would all "hiss" at me on 160 near the top end of the band at much
>>>>> over 1 KW out.
>>>>>
>>>>> 73,
>>>>>
>>>>> Roger (K8RI)
>>>>>
>>>>
>>>
>>>
>>>
>>
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