On 12/05/2021 18:36, Clive Arthur wrote:
On 12/05/2021 18:02, John Rumm wrote:
On 12/05/2021 16:42, Clive Arthur wrote:
On 12/05/2021 14:21, pinnerite wrote:
I have the following bound volumes that need a good home.

Wireless World Bound Volumes

I had WW - EWW - EW from about 1973 to 1993 IIRC.Â* Not bound, but
in good nick.Â* I tried eBay and a couple of clubs, but they nearly
all ended up in recycling.

A bloke off eBay just wanted one to fill a gap, so I sent it to him
FOC on condition he put a couple of quid in a charity box.

I kept the four with my published circuit ideas out of vanity, and so
I could boast about it here.

Could you stick copies of them on the wiki, for those curious and some
extra bragging rights?

No, they include my real name!

It was a long time ago, but two were fairly novel ways of solving
problems relating to FM tape recorders, one was a simple video combiner
and the last was just trying it on but it was actually useful...

We were designing a system where we wanted as much data throughput as we
could get at IIRC 9600 baud RS232.Â* It was fairly random data between a
real time controller and a logging PC.Â* The PC guy wasn't really up to
'fast' stuff so I made a speed meter.Â* RS232 is bipolar and flat-out a
random byte sequence should average 0V.Â* -ve voltages show under
utilisation, and +ve show likely problems, so I got a centre zero meter
and a suitable resistor and Bob was his uncle - an easy way of checking
throughput.

So that's it, resistor + meter - cash reward.Â* They were desperate for
content.

The first one appeared a couple of years later in EDN under another
name.Â* Someone had copied it and sent it to them - wish I'd thought of
that.


IIRC the spec for RS232 was +/-3 to +/-15v. How many implementations
obeyed that? Not to mention that random data in two stop bits mode
would not average zero volts !

PA