Dave,
I have to say that your Drake R4A is a neat looking bit of kit. I was a SWL
40-odd years ago and in those days - apart from Collins - the Drake line was
the bees-knees. All I could afford was a HRO-MX and no bandspread coils! Great
way of learning how to tune SSB signals with backlash on
On Thu, 20 Apr 2006 20:26:24 +0100
Dave [EMAIL PROTECTED] wrote:
Bob
The 8R line can be held on a little longer with the hold command in the
menu, if you wish to use the 8R line with either an opto-isolator or a relay,
I've got both circuits on my boat anchor with a K2 article at:
Don,
Your statement about VOX clipping is true of most transceivers. The one
exception that I know of is the STAR transceiver by G3XJP. With this design the
audio from the microphone is delayed in DSP until all of the RF changeover etc
has been accomplished. This gives a very clean and precise
On Apr 20, 2006, at 8:27 AM, Don Wilhelm wrote:
There is no 8T hold menu parameter - the 8R signal goes low 15 to
20 ms
prior to the onset of RF.
One question on this -- how does this work for SSB? Is there a
15-20ms delay circuit that allows the VOX to key before the RF makes
its way
Bill,
My opinion is showing, but VOX will clip leading syllables no matter what -
and that goes for any transceiver. It may or may not be important - not
much intelligibility will be lost in most instances, but the use of VOX
leads to operating practices on SSB that contain phrases like: Ahhh -
I'm pretty sure I now understand the operation of 8R and 8R HOLD.
Is 8T the inverse of 8R (ie goes high during transmit)?
Is there a 8T HOLD option anywhere?
At the moment I run 100% digital modes and I switch my linear via the RTS line
on COM1 (which goes high on TX) and an opto-isolator. I
Bob,
Yes, the 8T line is ALMOST opposite 8R - but not quite. 8R goes low prior
to 8T being asserted and 8R can be held low after RF disappears for a period
of time determined by the 8R HOLD menu parameter.
The 8R line is usually the one used for external keying. There is an
External Amp Keying
Bob
The 8R line can be held on a little longer with the hold command in the menu, if you
wish to use the 8R line with either an opto-isolator or a relay, I've got both circuits on my
boat anchor with a K2 article at:
http://www.astromag.co.uk/k2/K2externalRX.pdf (end of blatant advert for my
Hi everyone,
Since everything but the BFO was working I decided to finish wiring the
radio. Everything went down hill from there. At phase II all the control
functions worked perfectly but now the transmitter parts are in the
display flashes between the frequency, power output setting, and keyer
I'm new at this, so verify my comments.
On Wed, 3 Aug 2005 20:53:55 -, [EMAIL PROTECTED]
wrote:
Hi everyone,
Since everything but the BFO was working I decided to finish wiring the
radio. Everything went down hill from there. At phase II all the control
functions worked perfectly but now
Matt,
You are not incorrect, but I thought I might clarify - the real control over
8R and 8T is done on the control board from the RX and TX outputs from the
microprocessor - which drives the gates of Q3 and Q4, and in turn turns Q1
and Q2 on and off providing the 8R and 8T lines at the correct
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