Just Sharing This Analogue 70MHz IF Loop receiver

[Channel Hopper]

This topic caught my eye as I had this variable filter many years ago. I also installed many SR4500 at one point in time so had a look in my collection of old stuff and found this programming crib sheet I used to use. I hope it helps. PS the filters on a Chaparral Cheyanne had a better result.

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Yes, the Cheyenne was a very capable receiver with an intuitive menu and remote.

 

[Joolz]

Yes, the Cheyenne was a very capable receiver with an intuitive menu and remote.

Update. Full manual and updates found!! I will scan and share.

 

[Channel Hopper]

@Channel Hopper I presume that the tweaks on your PLL board adjusted the loop filter to optimise the bandwidth for best demod. Does it make much difference if you add extra filtering in that set-up?

It isn't my board, I would guess the potentiometers are in place to adjust for centering the filter to a maximum 36MHz (or 18MHz either side) of the 70MHz frequency, and limit amplitude to prevent clipping. Not unlike the front controls on the Phantom Filter.

 

[Satfaca]

If of any use or interest ... a couple of SR 5500 photos...

 

[Joolz]

Update. Full manual and updates found!! I will scan and share.

SR4500 New Features and upgrade document. Full EU manual in next post.

Sorry it is seperate pages - the merged pdf will not upload.

 

[John]

SR4500 New Features and upgrade document. Full EU manual in next post.

Sorry it is seperate pages - the merged pdf will not upload.

Excellent Joolz, i'll start reading .

 

[John]

If of any use or interest ... a couple of SR 5500 photos...

Thanks, looks like on that particular release of the 5500 the 70MHz IF Loop feature was not used - the IF socket positions seemed to have been blanked off.

 

[Joolz]

SR4500 New Features and upgrade document. Full EU manual in next post.

Sorry it is seperate pages - the merged pdf will not upload.

 

[Joolz]

2nd set of files

 

[Joolz]

2nd set of files

3rd set of files

 

[Joolz]

3rd set of files

Last set

 

[Channel Hopper]

Thanks, looks like on that particular release of the 5500 the 70MHz IF Loop feature was not used - the IF socket positions seemed to have been blanked off.

All Echostar receivers after the 4500 used tuners with different IF conversion (I think the transfer frequency was 480MHz but don't quote me on that)

 

[John]

Last set

Saved and printed off all of that .. Good work Joolz, appreciated

 

[John]

Saved and printed off all of that .. Good work Joolz, appreciated

and your only a few miles up the road as well .

 

[Channel Hopper]

Should somebody want to play with vintage kit.

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Have a gander at the imagery, one toggle switch on the back and two underneath.

 

[John]

Should somebody want to play with vintage kit.

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Have a gander at the imagery, one toggle switch on the back and two underneath.

Yes, saw that the other week - it's the same chap i got the battered Echostar 4500 to experiment with from. The added switches are a curiousity, especially the side mounted rotory switch looking thing..... i wonder whos had their fingers in that doing the mods and for what for

 

[John]

Yes, saw that the other week - it's the same chap i got the battered Echostar 4500 to experiment with from. The added switches are a curiousity, especially the side mounted rotory switch looking thing..... i wonder whos had their fingers in that doing the mods and for what for

Hmmm, i wonder ?
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[Manikm909]

Hmmm, i wonder ?
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View attachment 152487

i reckon - especially with those mods.