[Premium-Rx] real basic question on stability etc.

[Steve Stutman]

Hi,

Not familiar with P-1524. If used as sonobuoy RX though, the AFC makes 
sense. Sonobuoy TX is traditionally AM or FM; continuous carrier as 
discussed. Sonobuoy is disposable gear, so built to a price point. 
"Channelized", put on freq, at build. Usually xtal freq control, but 
often no TCXO because of cost. Before deployment, sonobuoy might be 
anywhere from say -30C to +50C. A minute or so later it's in a water 
bath and temp is at least -1.5C (sea-ice, North Atlantic) to maybe +25C 
(something more tropical. So carrier bound to move.

Can you end a jpg of tis radio?

73,
Steve
KL7JT


Eugene Hertz wrote:

> Ok, here's a novice question. I know that receiver stability is a big 
> topic of discussion. The more stable the better. But it seems to me 
> stability for a receiver is only as useful as the stability on the 
> transmitter?! Of course, if both Tx and Rx are drifting, then unless 
> they are drifting in the same direction at the same rate it certainly 
> would be better to have only one node drifting as opposed to both.
>  
> I recently acquired a receiver (not premium) P-1524(P)/WRR submarine 
> countermeasures receiver 30Mhz-1,000Mhz with plug in RF tuning stages 
> and it has this neat feature (probably common, but new to me) where it 
> has AFC automatic frequency control. It works pretty well (to my 
> unsophisticated mind). Essentially adjusts the LO up or down to match 
> the carrier of the transmitter.  I would imagine a feature like that to 
> perhaps be more valuable than stability. Who cares what the LO of the 
> receiver actually is, as long as its locked onto the transmitter.  
> Imagine being able to track the tx no matter how much it is drifiting. 
> That to me should be a great design goal. Now, I would imagine AFC would 
> be darn near impossible for ssb. But FM, AM and maybe even CW could benefit.
>  
> I am sure I am missing something.  Why the emphasis on stability and not 
> tracking?
> 
> Eugene
>  
> 
> 
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