TX1/TX2/TX3 do work as a sequencer (see Eric Wachsmann's 5/31/2011 reply
to the FlexEdge reflector titled "TX1 -2-3 info?").
Tim's example is correct for a single TX line connected to an amp.
However, TX1/TX2/TX3 are sequenced when using multiple TX lines with
delays. In other words, TX1, TX2 and TX3 do not all turn on (connect to
ground) simultaneously. Here's how the sequencing works when TX1, TX2
and TX3 are all selected for a given band:
Push PTT
1. Flex 5000A switches to transmit, but no RF out
2. TX1 On (no delay)
3. Wait TX1 Delay
4. TX2 On
5. Wait TX2 Delay
6. TX3 On
7. Wait TX3 Delay
8. Flex 5000A RF Out Starts
Release PTT
1. Flex 5000A RF Out Stops
2. Wait TX3 Delay
3. TX3 Off
4. Wait TX2 Delay
5. TX2 Off
6. Wait TX1 Delay
7. TX1 Off
8. Flex 5000A switches to RX
**TXn On indicates that TX port n is connected to ground causing the
relay to close; TXn Off indicates that TX port n is open (not connected
to ground) causing that relay to open.
This is exactly how you want a sequencer to behave. This also works if
only pairs TX1/TX2, TX1/TX3 or TX2/TX3 are selected. Just skip the
appropriate steps above involving the unused TX port and its delay.
73,
Clay W7CE
On 9/6/2011 2:28 PM, Tim Ellison, W4TME wrote:
That isn't how the TX relays operate. it isn't a sequencer.
When you press (assert) PTT, the TX relays close immediately.
If there is a time delay value set, then RF is not transmitted until
the delay time period expires.
Example:
TX Relay-1 is connected to an AMP and it has a TX time delay of 100 ms.
ANT-1 is connected to the amp
I press PTT
The amps keys immediately
No RF is allowed to egress the ANT-1 until 100 ms pass after pressing
PTT.
I hope that clarifies how it works, but I suspect that is not how you
had intended it to operate.
-Tim
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On 9/6/2011 4:50 PM, Kevin Hobbs wrote:
Tim . can you please confirm if this is correct???
Looking for some further explanation of TX1, TX2, TX3. The manual could
still use a little help or a good example.
I want to use TX1 and TX2 as a sequencer. I want TX1 to control
transmit/receive relays, TX2 to control 8877 amp.
I think:
TX1 delay 250
TX2 delay 150
Will cause:
TX1 to switch 250ms before the Flex actually transmits
TX2 to switch 150ms before the Flex actually transmits
Resulting in:
T/R relay to switch, followed by amp to key 100mS later, followed by
Flex to
transmit another 150mS later.
Is this correct (or backwards)?
73 Kevin
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