[Boatanchors] Fw: HRO coil alignment.

[Olaf Madsen]

----- Original Message ----- 
From: "Olaf Madsen" <Olaf at carolina.rr.com>
To: <boatanchors-request at mailman.qth.net>
Sent: Friday, October 07, 2005 6:57 PM
Subject: HRO coil alignment.


> Hello Fellows,
>
> I am working on an HRO-7,but I am sure my question applies to any of the 
> HRO's that use the coilboxes for the individual frequency 
> ranges.(Junior,Senior,5,50,60 )
>
> When aligning the radio,the manual or literature tell you to align the 
> high end of the frequency range with the trimmers that are accessable from 
> the top of the receiver with a long screwdriver,---e. g .You can set the 
> oscillator frequency and peak the RF and mixer stages without much 
> difficulty on the high end.
>
> On the ''low end'' you normally make the adjustment at the coils and the 
> manual tells you to ''bend'' the ''1/2 loop'' of the appropiate coil to 
> either increase or decrease the inductance.---.to find out if you need to 
> make any adjustment,you should deflect the rotor plates of the tuning 
> capacitor to find out (judge by the noise ),which way to twist that 
> coil-loop.
>
> HAS ANYBODY EVER DONE THAT ???---You cannot get at the ''blasted'' thing 
> in the radio,unless you remove the coilbox ,make somekiind of haphazard 
> adjustment,e.g.just ''wing it'' and shove the coilbox back in and see if 
> you have guessed right.
>
> I need some help here from an HRO expert.---Should I ignore the ''low 
> end'' alignment and make the trimmer adjustment just in the middle of the 
> frequency range of the coilset ??----I have not played with the Bandspread 
> ranges at this point,just the General  Coverage range.---What is the best 
> way to tackle the problem ???---tracking across the band, some improvement 
> should be possible with proper alignment.
>
> This subject may not be of much interest to most of the group.you 
> therefore may wish to answer me ''OFF'' the list.
>
> Tnx for any help here and the good advice,I have received  in the 
> past.----73's de Olaf,KF4TP---
>
>