[Heath] LMO rebuilding....did I mess it up?

[Guy Giacopuzzi]

Ok, that's the first mistake I made in rebuilding it...I made so at the 
full, counterclockwise position, the capacitor was close to fully 
closed; I should have set it up fully open...so that when I turn the 
dial clockwise, the LMO frequency should go down, right? As the 
indicated frequency goes up, the LMO should be descending from 5.5 to 
5.0mhz, right?  I set mine up doing just the opposite..LMO is going up 
when indicated freq is going up, which is wrong....Gotta take the darn 
LMO out again.....
Guy

On 3/13/2016 2:48 PM, Kenneth G. Gordon wrote:
> On 12 Mar 2016 at 20:08, Guy Giacopuzzi wrote:
>
>> reading (and receiving) it on 7181khz...Did I do something wrong with the LMO?  I checked it's
>> range of movement,and with the tuning unit dialed all the way counterclockwise, the  variable
>> cap is almost closed; then, five turns to the right and the cap is fully opened, as I recall.  I didn't
>> check it on any other bands, but at the moment, it would seem the LMO's output is 219khz too
>> low....right?   It's reading 219khz low exactly on both bands..... Help....
> Guy: What seems odd to me is your "range of movement". As I remember
> it, the tuning cap in the last Heathkit LMO I worked on only moved over a
> fairly small range of tuning, not the entire capacitor's tuning range. As I
> remember it (and it has been several years since I rebuilt an LMO) the
> range of movement was only about 1/3 the total available range.
>
> But Heathkit used at least two different makers of LMO, so perhaps yours
> and mine are by different makers. I think the one I was working on was a
> TRW.
>
> Now, as for your dial reading 219 kHz low, that sounds like the dial has
> either slipped, or the hub has broken.
>
> Have you measured the output of the LMO itself? It should be 5.0 to 5.5
> MHz with a little "overlap" on both ends. Something like 4995 to 5505 kHz
> total.
>
> Also it will read the 5.5 MHz at the low ends of the bands, and the 5.0 MHz
> at the high ends: it "tunes backwards".
>
> Ken W7EKB
>

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