[Boatanchors] Fw: HRO Alignment of Plug-In Coilsets

[Olaf Madsen]

> > Subject: HRO Alignment of Plug-In Coilsets
>>
>>
>>>I am working on an HRO-7,trying to make the alignment on the various 
>>>plug-in coilsets.----HRO-5,or any of the other HRO's also use these 
>>>coilsets.
>>>
>>> The sensitivity varies greatly over the tuning range,particularly for 
>>> the General Coverage Ranges (say 3.5 to 7.3 Mc for the ''C'' set )
>>>
>>> The procedure for alignment described in the instruction manual allows 
>>> for adjustment at a HIGH frequency point of the range (7.3Mc for the 
>>> ''C'' set ) by the trimmers which are accessable at the front of the 
>>> coilsets from the inside of the receiver.
>>>
>>> Any alignment to the LOW frequency end must be made by changing the 
>>> Inductance of the coils from the back of the coilset---however---there 
>>> is NO ACCESS to them ,except when the coilset is OUT of the 
>>> receiver..---the same goes for the Padding trimmers,they cannot be 
>>> reached while the coil set is plugged in.
>>>
>>> In the words of the manual : ''The original alingment was ("is'') 
>>> accomplished by the use of precision,crystal -controlled test 
>>> oscillators.---No realignment should be attempted,'' etc etc.
>>>
>>> What's  a ''boanchor ham'' to do with a 50 odd year piece of gear that 
>>> needs some TLC.--What do you say you old  guys from ''National 
>>> Company''---Any advice ????---or references.
>>>
>>> Tnx fr any help --73 de Olaf,KF4TP---
>>>
>>
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