[time-nuts] FSCM 38243 Power Distribution Module
lists at rtty.us
Sun Mar 2 15:02:46 EST 2014
If you look at the wiring to the input connector and the output connectors, that’s not the way you wire VHF or UHF gear. The same is true for the “ground through case” on those connectors.
On Mar 2, 2014, at 12:54 PM, Tom Miller <tmiller11147 at verizon.net> wrote:
> It looks like the input hits a 2 way splitter that drives each of four ports. Most of these have at best a 3 dB loss, more like 4.5 dB. Then it each of those gets split again to drive two ports. Then another split to each port. So lets say at best it is 3 + 3 +3 = 9 dB. But being broadband, I believe it will lose a bit more than 3 dB per split. Say 4 + 4+ 4 =12 dB.
> If it is military, then it could be for something in the 225 to 400 MHz range. I don't think there are enough turns on the transformers for 10 MHz but I could be wrong. Only a test will confirm it and there are many people on this list that can make that measurement. I am in MD so if close, let me know.
> ----- Original Message ----- From: "Robert Atkinson" <robert8rpi at yahoo.co.uk>
> To: <time at patoka.org>; "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Sunday, March 02, 2014 3:06 AM
> Subject: Re: [time-nuts] FSCM 38243 Power Distribution Module
> From the construction and components used it isn't UHF ;-) It appears to be 7 two way splittters in series and the transformers look to have plenty of turns.
> As you have a 10MHz source why not just try it out? You should get about 9dB attenuation input to output with the other ports terminated in 50R. This could be checked by reference to a 10dB attenuator with a 50R load, diode and multimeter as indication if you don't have an accurate power meter.
> Or if you ship it to me I can stick it on a VNA and give you exact specs.
> Robert G8RPI.
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