[Milsurplus] AN/GRR-5 No reception on Band 1

[Bruce Gentry]

Check to see the oscillator is running on band 1.  If it is running, see 
if it is on frequency.  I have had a part of the clip at the top of the 
coil that holds the threaded stem of the slug break free and fall down 
on top of the slug. That will either stop the oscillator or send it so 
far off frequency you won't receive anything.  I discovered this when my 
GRR-5 worked fine with the receiver chassis upside down on the bench. 
Put it back in the case and one band died. If the oscillator is running 
at the correct frequency, touch a piece of wire several feet long to the 
signal grid of the converter tube. If you can receive something and can 
tune  the receiver to different frequencies,  then start working back 
toward the antenna through the RF amplifiers until you find the problem. 
The only condensers that can kill a band are those associated with the 
coils for the band in question. An open or shorted coil can kill a band, 
as well as bad or broken contacts on the band switch sections.   As for 
tubes- they all look very good. Battery filament tubes have the greatest 
difficulty with higher frequency bands, if they work fine at 15MC., they 
are more than up to the job at 1.5MC

       Bruce Gentry, KA2IVY


On 6/27/18 7:25 PM, Carl Reinemann wrote:
> I've got a AN/GRR-5, gets great reception on bands 2,3, and 4, can 
> pull in many stations, but, on band 1 (1.5 Mhz) I get very low audio 
> and no reception of anything.  What should I be looking for? Caps? All 
> tubes test great.
>
> Carl
>
>
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