[Test-Equipment] Millen 9061 GDO with low frequency coils

[k9muf at comcast.net]

Ray

If you have an accurately calibrated receiver or a frequency counter, you could very loosely couple it to the GDO. It must be loosely coupled                                  so as not to "pull" the GDO frequency off of it's dip. Also                                             the GDO must be very loosely coupled to the circuit being tested so as to barely get a "dip".
                                      
In fact, I use this method for the bands for which the GDO has scales for because those are very hard to read and are not very accurate.

Don







> On 05/07/2024 4:47 PM CDT Ray LaRue <w4byg at att.net> wrote:
> 
>  
> I recently added a very nice Millen 90651 GDO to my "stash", which also 
> had low frequency coils for the AM broadcast band and below. It seems 
> these would be useful for the low frequency ham allocations.
> 
> However, I don't see any scales on the dial which would reveal a 
> frequency of a given dip using one of these coils. I also don't see any 
> clue in the manual that comes with it.
> 
> I wonder if there are any old timers on the list that know how to read 
> the GDO frequency with these LF coils?
> Maybe I'm just missing the obvious. Your attention is appreciated.
> Ray, W4BYG
> 
> -- 
> "If you want to build a strong house, I'll give you my engineer's number.
>   If you want to build a strong life, I'll introduce you to my carpenter."
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