[TowerTalk] Ameritron Remote Controlled Switches
Wed, 11 Nov 1998 21:45:51 -0600
We use allot of 7/16 RF in the high power rf plasma generator industry.
They are great. More and more companies will carry them. I talked to
Joel at RF Connection yesterday and he is getting them in too.
Steve Gehring, KL7DC wrote:
> >Perfect N connectors will handle 1.5kW ICAS at 432MHz (Reference: K1FO
> >in the ARRL UHF/Microwave projects book. Sorry I can't give you an exact
> >quotation, someone else has the book at the moment.) I can confirm this
> >at 900-1000W ICAS. The kind of "ICAS" we mean is EME contest service,
> >slow Morse code for 2.5min on, 2.5min off, for 6-10 hours.
> >However, with IMperfect N connectors it's anybody's guess! That's why I
> >only use brand-new, top-quality N connectors for QRO on 432MHz. There
> >aren't many connectors involved, so the peace of mind is well worth the
> >>Besides the UHF connector, is there another alternative to the N that is
> >>about the same size, but better at power handling, ease of installation,
> >>and ruggedness? For example, use of the C or HN series?
> >C and HN are good, but sometimes hard to find. C connectors are like a
> >giant BNC so are quick to connect and have good power handling; but like
> >BNC they use a rubber gasket as a spring, which becomes slack with age
> >and allows the whole connector to spin. HN are like N but bigger -
> >though still not as big a center pin as a PL259.
> >For UHF QRO I'm gradually trying to change to 7/16 DIN, which are
> >seriously large connectors good for several kW at UHF. They originated
> >in Germany but are being increasingly used in cellular base stations
> >world-wide, because they give reliably better connections with lower
> >inter-channel IMD than N. They're gradually emerging onto the surplus
> >market over here, but would be major overkill at HF!
> >>Here's perplexing question. Why is the N rated for 1500V and the BNC rated
> >>for 500V, with their dielectrics of air/TFE and TFE respectively (excluding
> >>mating junctions)? Could it be center pin size again? Could the designers
> >>have limited the current capacity through the voltage rating, referenced to
> >>50 ohms with the BNC?
> >Dunno, beats me Guv...
> >>Wanting to stay away from clunky, labor intensive UHF connectors...
> >With my background, I just can't bring myself to call them "UHF" at all.
> Thanks again for the info, guys. I really appreciate the hundreds, if not
> thousands of years of experience this reflector's users provide.
> NOTE: I haven't heard of the 7/16 DIN rf connector. I'll have to research
> Steve, KL7DC
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