On Wednesday, June 08, 2011 01:22:20 AM Vivian Meazza wrote:
> Hal,
>
>
>
> Glad to be able to help. I'm looking forward to your corrected model, then
> I'll use it in part or in for the TR1133. As you probably know, the SCR-522
> was the TR1133 built initially under a UK contract in the US. The TR1133
> transmitter and receiver were reworked by Bendix into a single unit, but
> the cockpit control box remained unchanged throughout the life of the
> equipment AFAIKS.
>
>
>
> I now have a working Channel selector interfaced with comm[0] - trivial.
> Now for a menu to set the Channel frequencies
>
>
>
> Vivian
I am working on the model for the control unit now. It turns out that my
"eyeball" was slightly miscalibrated and the model was too small by perhaps
10% or so. The new version is somewhat bigger (about 1.3 CM longer for
example). But the old version had about the correct proportions. It is now
correctly sized and has the content of the placards as well. I am working on
other details like rivets, connectors and screw heads. The dimmer control now
dimms all of the lights including the TR light.
I will also be adding the transmitter/reciever and the dynamotor boxes and
perhaps some connectors so that these can be placed in models where these are
visible like the P-51D. These may not be too useful for your version of the
radio since I will be modeling the Bendix version with a single TR box. These
also may not be visible in your aircraft.
When I have the models in place and have updated the P-51D to use them (the
bigger radio requires some changes to the P-51D configuration to get it
properly placed in the cockpit) I will push these into my gitorious repository
and request a merge. I have lots on my plate right now so this will probably
be early next week.
One interesting side note for those with an interest in electronics. The
dynamotor has several different output voltages including 28 volts and 300
volts. From my radio backgound (AC6VZ) I know that the 300 volt output is
probably for the power amp stage of the transmitter. I am not too sure how
much power output this unit had but from what I have read air to air range was
several hundred miles. Total power consumption when transmitting is about 320
watts and 308 watts in recieve so it appears that it's output is around 10
watts. This is comparible to modern aircraft VHF radios. Of course modern
aircraft radios probably only consume 15 to 20 watts max when transmitting and
perhaps only 1 watt when recieving since they are solid state and don't have
all of the losses in the dynamotor.
Hal
>
>
>
> -----Original Message-----
> From: Hal V. Engel [mailto:hven...@gmail.com]
> Sent: 07 June 2011 23:24
> To: flightgear-devel@lists.sourceforge.net
> Subject: Re: [Flightgear-devel] SCR-522 (was Rating System Redux
> (wasRe:Flightgear-devel Digest, Vol 61, Issue 12))
>
> On Tuesday, June 07, 2011 12:49:34 AM Vivian Meazza wrote:
> > I expect you have already seen this -
> >
> >
> >
> > ftp://abbeytheatre2.org.uk:2121/flightgear/SCR-522/SCR-522.pdf
> >
> >
> >
> > Right now I'm busy converting the SCR-522 into its progenitor, the
> > TR1133.
> >
> > Not that it's hard - externally they are exactly the same bits of kit. I
> >
> > have found a number of duplicate vertices/bad surfaces however. Based on
> >
> > the Manual there are some small errors in the interpretion the function
> > of
> >
> > the T/R/REM, and some of the dimensions. Key. I'll push the TR1133 into
> >
> > git soon, but as a new item: I will not overwrite any of the SCR-522
> >
> > stuff.
>
> This is great info. I googled the SCR-522 when I was working on it's model
> and did not find much on line other than grainy old photos. Because of this
> I sized the unit by comparing it to photos of it in place in a P-51
> cockpit. So I knew that it's dimensions were not totally correct and I was
> not sure about some other details.
>
> I mistakenly thought that the switch-locking lever was a dimmer for the
> "T-R-REM" indicator lamp. Also I did not know that I had the T-R indicator
> lamp function backwards (IE. off when receiving which is what it is on
> modern radios - when it should be on when recieving). So these things are
> wrong in my model.
>
>
>
> Also from the photos I had it was not apparant that the front and back of
> the control box had removable covers so the screws are missing as well as
> the covers not being propery contured.
>
>
>
> My model is also missing the connectors on the bottom of the control box.
>
>
>
> Then Vivian is able to find a complete manual for the radio which includes
> good line drawings for all of the radio components including dimensions.
> Having these drawings makes it possible to add other stuff (radio box,
> dynamotor, cables and connectors) behind the armor plat in the P-51D (above
> the fusealge fuel tank) and have things accurately modeled. So this is very
> useful to me as it will make the P-51D model more accurate and detailed.
>
>
>
> One orher issue is that there are two placards on the side of the radio
> control box that in P-51 installations were visible. These are visible in
> Figure 17 of the radio manual (page 37) but are only shown edge on. I know
> that these are brass plates with red and black backgrounds but I didn't
> know what was on these placards and my current texture no content on the
> placards. There are no photos/drawings of these particular placards in the
> manual. I will do some googling to see if I can find more info about these
> placards.
>
>
>
> Hal
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