Page 1 of 4
Stealth Microwave SM2325-47 Amplifier
Posted: Wed Aug 29, 2018 6:42 pm
by G1BVI
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
G1BVI
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Mon Sep 03, 2018 12:41 pm
by G1LPS Terry
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Mon Sep 03, 2018 1:01 pm
by G8GKQ
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Mon Sep 03, 2018 4:53 pm
by g0mjw
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Tue Sep 04, 2018 7:17 pm
by G1LPS Terry
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Tue Sep 04, 2018 8:29 pm
by g0mjw
Worth a try probably. Maybe need the odd adjustment.
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Tue Sep 04, 2018 8:56 pm
by G8GKQ
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Wed Sep 05, 2018 11:11 am
by G1BVI
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
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Wed Sep 05, 2018 11:24 am
by g0mjw
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.
Re: Stealth Microwave SM2325-47 Amplifier
Posted: Wed Sep 05, 2018 2:26 pm
by G1BVI
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