[Boatanchors] HRO Alignment of Plug-In Coilsets

[Carl]

In the National Service Dept a complete recap and alignment of the usual 
4 coils was a one day affair. Once you got used to the procedure it was 
rather simple.

Carl
KM1H
National Radio
1963-69
----- Original Message ----- 
From: "Bob Young" <youngbob53 at msn.com>
To: <boatanchors at mailman.qth.net>; <olaf at carolina.rr.com>
Sent: Wednesday, January 14, 2009 12:14 PM
Subject: [Boatanchors] HRO Alignment of Plug-In Coilsets



I plug the coil sets in and out, adjust the inductance while out and 
plug it back in again. I do this until I find the point where the 
sensitivity is greatest. It's a PITA but eventually you get the hang of 
it and they are not real touchy anyway. The trimmers can be accessed on 
HRO-50's and 60's while plugged in don't know about the older ones but I 
believe I have read somewhere that there was a method. The trimmers are 
very precise, the coils aren't. I do the trimmers first to get it on 
frequency.

Bob Young
KB1OKL


> Message: 3
> Date: Tue, 13 Jan 2009 21:09:54 -0500
> From: "Olaf Madsen"
> Subject: [Boatanchors] Fw: HRO Alignment of Plug-In Coilsets
> To:
> Message-ID:
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
>
>  From: "Olaf Madsen"
> To:
> Sent: Tuesday, January 13, 2009 9:05 PM
> 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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