Stealth Microwave SM2325-47 Amplifier

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G1BVI
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Stealth Microwave SM2325-47 Amplifier

Post by G1BVI » Wed Aug 29, 2018 6:42 pm

Hi All felow BATC Members
I wonder if anyone has one of these surplus?

https://4donline.ihs.com/images/VipMast ... 43A3159BB0
I saw a couple on ebay a year or so ago and sadly missed out :-(

Thanks and 73


Nick
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G1LPS Terry
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G1LPS Terry » Mon Sep 03, 2018 12:41 pm

https://www.ebay.co.uk/itm/Stealth-Micr ... Swp6pbeAF3

This seller still has them.
Would suggest anyone intrested puts a low bid in ;) to drive the price down

Terry
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G8GKQ
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G8GKQ » Mon Sep 03, 2018 1:01 pm

Well spotted Terry - but these are the 3.4 GHz ones (which are great for 9 cms, but no good for Es'hail-2).

Dave
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g0mjw
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Re: Stealth Microwave SM2325-47 Amplifier

Post by g0mjw » Mon Sep 03, 2018 4:53 pm

And £129! when the boxes containing two along with their PSUs were going for £10 last year. The 2.4 GHz ones are rare. Better chances with a pyrojoseph Spectrian unit. 30W rather than 50W but very linear.

https://www.ebay.co.uk/sch/pyrojoseph/m ... 7675.l2562
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G1LPS Terry
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G1LPS Terry » Tue Sep 04, 2018 7:17 pm

Has anyone tried the Stealth Microwave Model SM2527-44LFFV a 2.5ghz one on 2.4ghz?
These are available on ebay now
https://www.ebay.co.uk/itm/EX-MOD-Steal ... SwtmRavLVy
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g0mjw
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Re: Stealth Microwave SM2325-47 Amplifier

Post by g0mjw » Tue Sep 04, 2018 8:29 pm

Worth a try probably. Maybe need the odd adjustment.
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G8GKQ
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G8GKQ » Tue Sep 04, 2018 8:56 pm

Hi Terry

Yes - there are no issues with running this model at 2405 MHz. As I recall, I obtained 15W output with 35dB shoulders on DATV.

Dave
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G1BVI
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G1BVI » Wed Sep 05, 2018 11:11 am

Ordered one.
Looks like its -9dbm for full o/p.
thats 0.125mW !!

Will have to bring it into the lab at work and see how it performs at 2.4GHz.
73
Nick
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g0mjw
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Re: Stealth Microwave SM2325-47 Amplifier

Post by g0mjw » Wed Sep 05, 2018 11:24 am

The one I had (claimed working) actually had a blown first stage. It was just a modamp and I simply bypassed it. This means I needed about 1mw of drive, so you might consider doing that if it's too sensitive. I also recall having a similar 2527 amplifier that did not work well at 2320.
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G1BVI
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Re: Stealth Microwave SM2325-47 Amplifier

Post by G1BVI » Wed Sep 05, 2018 2:26 pm

When I get it
I will monitor the output and bring the drive up slowly from a signal generator.
linking out the amp actually sounds sensible for circa 0dm i/p.
The ebay units have no heatsinks fitted I wonder how hot it gets.
Probably worthwhile fitting something extra onto the box especially for DTV

From spec sheet it looks like there are feed through terminations for power and also an output for fwd and rev.
Its not obvious from spec sheet I found what signal needs to be applied to CTRL and on/off.

73

Nick
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