[Milsurplus] RBZ vs RBZ Special?

[Mike T]

I did think it sounded a bit strange when I first read it. If one could manage to find 7mc of adjustment in a trimmer then those must be some exceptionally touchy trimmer caps.

- Mike


--------------------------------------------
On Mon, 9/16/13, Al Klase <ark at ar88.net> wrote:

 Subject: Re: [Milsurplus] RBZ vs RBZ Special?
 To: "Mike T" <gtsrmike at yahoo.com>
 Date: Monday, September 16, 2013, 3:29 PM
 
 Mike,
 
 That's a big step up in frequency.  I would have never
 expected the trimmers to take care of it.  I think
 you'd have to rewind the coils, rather than just pruning
 them, as they need to be spread along a particular portion
 of the form to tune properly.
 
 Take care with the radium pain to the dial.  Like maybe
 immobilize it with clear nail polish.  Mine's pretty
 hot.
 
 Al
 
 On 9/16/2013 2:11 PM, Mike T wrote:
 > I've been trying to research what the circuit
 differences are between the RBZ and RBZ Special. The
 difference on paper is that the RBZ covers from 2.0mc to
 5.8mc whereas the Special covers from 5mc to 13mc. From the
 limited information I've been able to find it seems like the
 conversion was a field conversion that involved little more
 than realigning the receiver and changing the dial face for
 a new one. I spent some time today attempting to do just
 that on my RBZ and found that the RF and OSC trimmers would
 only give about +/- 300khz of adjustment. I'm not sure where
 they found an extra 7mc or so. Does anyone have any
 information or ideas?
 > 
 > - Mike
 >
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 -- Al Klase - N3FRQ
 Jersey City, NJ
 http://www.skywaves.ar88.net/