This is not Antenna related,but it applies to Amateur Radio
I had a couple of extra digital clocks at home and I needed two or the ham
shack (Local,UTC)
I wanted both clocks in 24hr mode,so I goggled the clock IC used in the
digital clock,and found most of the using a very general purpose clock IC
and all capable of doing 24hrs format buy a small modification,usually this
mod is just a matter of shorting a couple of pins on the IC
My ic was a LM8560 so all I had to do was jump pins 15 to 28 to make the
clock work in 24hr mode
works great,now all I have to do is glance at the clocks and with an
instance of have both times .I know its an easy conversion to do in you head
but this makes it much more convenient and its a way of using some of the
old stuff around the house and utilizing it rather then throwing it away or
even better having to buy two clocks for the ham shack
Just my contribution to the group
Howard
VE4ISP

I tried this a long time ago and discovered that at least some of the
consumer clocks sold here in the U.S. have only a single segment in the
tens of hours display digit. That's true of the most recent LED clock
I've purchased, so I think it's still common. Don't know how common it
is for LCD clocks, but it's possible that only a single segment is
connected. I think the problem is that the U.S. is a big enough market
that it's cost effective for the manufacturers to make a special version
just for it.

Self-setting "atomic" clocks are getting pretty inexpensive these days,
so I've got two in my shack beside each other, one set to local and one
UTC. The one I use for UTC is made by LaCrosse, and it has a 24 hour
display option.

Roy Lewallen, W7EL

Howard Kowall wrote:
This is not Antenna related,but it applies to Amateur Radio
I had a couple of extra digital clocks at home and I needed two or the ham
shack (Local,UTC)
I wanted both clocks in 24hr mode,so I goggled the clock IC used in the
digital clock,and found most of the using a very general purpose clock IC
and all capable of doing 24hrs format buy a small modification,usually this
mod is just a matter of shorting a couple of pins on the IC
My ic was a LM8560 so all I had to do was jump pins 15 to 28 to make the
clock work in 24hr mode
works great,now all I have to do is glance at the clocks and with an
instance of have both times .I know its an easy conversion to do in you head
but this makes it much more convenient and its a way of using some of the
old stuff around the house and utilizing it rather then throwing it away or
even better having to buy two clocks for the ham shack
Just my contribution to the group
Howard
VE4ISP

Howard Kowall wrote:
This is not Antenna related,but it applies to Amateur Radio
I had a couple of extra digital clocks at home and I needed two or the ham
shack (Local,UTC)
I wanted both clocks in 24hr mode,so I goggled the clock IC used in the
digital clock,and found most of the using a very general purpose clock IC
and all capable of doing 24hrs format buy a small modification,usually this
mod is just a matter of shorting a couple of pins on the IC
My ic was a LM8560 so all I had to do was jump pins 15 to 28 to make the
clock work in 24hr mode
works great,now all I have to do is glance at the clocks and with an
instance of have both times .I know its an easy conversion to do in you head
but this makes it much more convenient and its a way of using some of the
old stuff around the house and utilizing it rather then throwing it away or
even better having to buy two clocks for the ham shack
Just my contribution to the group
Howard
VE4ISP



A few years ago, I was caught out of town. Missing the sound of SW/AR,
I purchased a DX-392 by Radio Shack (hey, it was cheap and has a stable
BFO. I have a few cheap radios, just from such "forget-full-ness" ...)

This radio has two clocks, both ONLY operate in 24hr mode. This cheap
radio has served me well ... and of course, one clock is pacific time
and one is UTC/GMT.

However, the wife ONLY thinks in 12hr mode :-) and, ALWAYS corrects the
time, telling it to me in the 12hr format LOL!

Warm regards,
JS

In article ,
"Howard Kowall" wrote:

I wanted both clocks in 24hr mode,so I goggled the clock IC used in the
digital clock,and found most of the using a very general purpose clock IC
and all capable of doing 24hrs format buy a small modification,usually this
mod is just a matter of shorting a couple of pins on the IC

Howard-

I built a clock from Radio Shack plans and parts back in the 1970s.
That chip had the 24 hour option, but used the same pin to change from
60 Hz to 50 Hz! I got around that by using an SN7410 to convert 60 Hz
to 50 Hz.

Fred

On Wed, 12 Nov 2008 19:43:03 -0600, "Howard Kowall"
wrote:

This is not Antenna related,but it applies to Amateur Radio
I had a couple of extra digital clocks at home and I needed two or the ham
shack (Local,UTC)
I wanted both clocks in 24hr mode,so I goggled the clock IC used in the
digital clock,and found most of the using a very general purpose clock IC
and all capable of doing 24hrs format buy a small modification,usually this
mod is just a matter of shorting a couple of pins on the IC
My ic was a LM8560 so all I had to do was jump pins 15 to 28 to make the
clock work in 24hr mode
works great,now all I have to do is glance at the clocks and with an
instance of have both times .I know its an easy conversion to do in you head
but this makes it much more convenient and its a way of using some of the
old stuff around the house and utilizing it rather then throwing it away or
even better having to buy two clocks for the ham shack
Just my contribution to the group
Howard
VE4ISP


I like your attitude.