dbm to volts (humax F2foxT)

"mike" wrote in message
...
"Bill Wright" wrote in
:
Buggered if I'm going there; I'd be with the God-bothering idle smug
overpaid killer quack Cockcroft from Billericay Health Centre who makes
me come in to tick all the boxes to get his overinflated pay-packet, but
for the first time in years I went in on my own volition told me it was
nerves and refused a little light endoscopy, which only takes 15 mins.

When I collapsed and a real doctor found the truth, too late, he called
it an Adverse Outcome and said it was all my fault as he's an expert on
the disease and he's an excellent listener..

Thanks for telling us. It might strengthen someone's resolve not to be
fobbed off.

Bill

"Andy Wade" wrote in message
...
There is a standard for flyleads (EN 60966 series, EN60966-2-5:2003 for
IEC leads to 1 GHz), which includes requirements for insertion loss,
impedance matching and screening factor, but it seems, alas, to be very
little used.

Do you know of any that comply?

Bill

"Mark Carver" wrote in message
...
Andy Wade wrote:
Mark Carver wrote:

Better stil, use F-type connectors, and F-type-BL adaptors where
needed.

A problem with that approach is that most F-to-BL/'IEC' adaptors exhibit
pretty appalling return loss figures, often as poor as 9 dB in Band V, so
they upset impedance matching and introduce unnecessary mismatch-loss and
SWR ripple.

[snip]

Thanks Andy, I didn't know that. I've got about a dozen in use around my
house that I fished out of a skip in Holland. Perhaps that's why they were
in there !

I would never use an 'f' to belling adaptor except for a temporary
connection.

I have to say that good quality brass or aluminium bellings, properly
fitted, cause no problems. I wouldn't want to use crimp ones at £1 each,
that's for sure.

Bill

Bill Wright wrote:
"Mark Carver" wrote in message

Thanks Andy, I didn't know that. I've got about a dozen in use around my
house that I fished out of a skip in Holland. Perhaps that's why they were
in there !

I would never use an 'f' to belling adaptor except for a temporary
connection.

I wonder what makes them so bad ? I need an X-Ray machine !

--
Mark
Please replace invalid and invalid with gmx and net to reply.

In message , Mark Carver
writes
Bill Wright wrote:
"Mark Carver" wrote in message

Thanks Andy, I didn't know that. I've got about a dozen in use
around my house that I fished out of a skip in Holland. Perhaps
that's why they were in there !
I would never use an 'f' to belling adaptor except for a temporary
connection.

I wonder what makes them so bad ? I need an X-Ray machine !


ARE they bad? I know one type of F-to-BNC (hopefully no longer supplied)
need to be avoided like the plague, but I have nothing against
F-to-Belling.
--
Ian

"Ian Jackson" wrote in message
...
In message , Mark Carver
writes
Bill Wright wrote:
"Mark Carver" wrote in message

Thanks Andy, I didn't know that. I've got about a dozen in use around
my house that I fished out of a skip in Holland. Perhaps that's why
they were in there !
I would never use an 'f' to belling adaptor except for a temporary
connection.

I wonder what makes them so bad ? I need an X-Ray machine !


ARE they bad? I know one type of F-to-BNC (hopefully no longer supplied)
need to be avoided like the plague, but I have nothing against
F-to-Belling.

I've had a few problems so I just avoid them where I can, without worrying
about individual types. By far the worst was a particular Chinese 'f' rt
angle connector. I opened one up and couldn't see anything obvious, but they
were terrible.

We've recently had a problem with a batch of 'f' plugs (screw on; 6.5mm)
that always always fell apart when you tightened them up.

Then there were the famous bellings with the screw to secure the inner; the
head of the screw touching the barrel when the inner was in place. Thousands
were sold. I personally encountered them on half a dozen 'mystery' jobs. Tee
hee! Money for old rope!

Bill

On 06/08/2007 10:32, Bill Wright wrote:

We've recently had a problem with a batch of 'f' plugs (screw on; 6.5mm)
that always always fell apart when you tightened them up.

I thought that was just me not knowing my own strength!

In message , Andy Burns
writes
On 06/08/2007 10:32, Bill Wright wrote:

We've recently had a problem with a batch of 'f' plugs (screw on;
6.5mm) that always always fell apart when you tightened them up.

I thought that was just me not knowing my own strength!

But just how do you break screw-on F-connectors (normal straight type,
of course)?
--
Ian.

On 06/08/2007 21:04, Ian Jackson wrote:

But just how do you break screw-on F-connectors (normal straight type,
of course)?

When I tightened them up it pulled the lip of the "knurled body" out of
the "nut".

In message , Andy Burns
writes
On 06/08/2007 21:04, Ian Jackson wrote:

But just how do you break screw-on F-connectors (normal straight
type, of course)?

When I tightened them up it pulled the lip of the "knurled body" out of
the "nut".


The ones I have are all one piece (at least, I'm pretty sure they are -
there's no need for them to be two pieces.) I don't use them much, but
I'll have another look at them.
--
Ian.