As far as older Yaesu transceivers are concerned, their design is
proprietary and cannot be brought into the mold without serious
converters (which should frankly be easily constructed by the serious
amateur).
Yaesu's transceivers were the *first* to use BCD "band data". As such,
it should be incumbent on anyone using that interface to be electrically
compatible with Yaesu's interface (source +5/+12V for logic high, open
circuit for logic low). Even the amateur DOS based logging software
that provided "band data" on a computer LPT port duplicated that
interface.
Absent any documented standard for the interface, any product developer
who claims to support "BCD band data" should be expected to properly
emulate the Yaesu "ports" so that their receiver works with any Yaesu
transceiver and/or their transceiver properly drives any Yaesu amp
(FL-7000/Quadra).
The issue is accessory makers who are not +12V tolerant and those who
apply voltage to the BCD lines ... and transceiver makers who provide
"band data" ports that do not source +5/12V for logic high.
73,
... Joe, W4TV
On 3/2/2018 4:43 PM, ab2tc wrote:
Hi all,
Of course this assumes that the sole transmitter on the bus obeys the rules
as well, which is to be an open collector or open drain (or relay contact to
ground). I am sorry if I omitted that point.
As far as older Yaesu transceivers are concerned, their design is
proprietary and cannot be brought into the mold without serious converters
(which should frankly be easily constructed by the serious amateur).
My main point is that the amateur community should move towards following
the "standard". If all devices followed that "standard" they would all work
together and there would be no problem with one device powering another.
AB2TC - Knut
ab2tc wrote
Hi all,
I was reluctant to respond again to this long thread, but I will.
If all receivers on the bus (yes, it is a bus) were to obey the rules to
have a pullup resistor and a steering diode we would not have the problem
of
"false power" to devices on the bus. This would be proper engineering
practice which has unfortunately been ignored by the the ham community for
years.
AB2TC- Knut
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