[Elecraft] Feature request - Disable Break In on K3

[Joe Subich, W4TV]

> In the unlikely event anyone is interested, I use one of WW2R/G4FREs
> band selection boards to provide a 12V signal for
> 4m/2m/70cm/23cm/13cm/9cm/6cm/3cm band. It monitors the K3 RS232 line.
> It also provides band by band PTT but I don't use that facility, I
> gate a single PTT line via the 12V per band.

Why don't you simply add a second gate?  Gate KeyOut (which you are
using for PTT) by band select *and* the signal you use as the K3 PTT
*input*.  In other words take a NOR gate, connect a diode from one
input to the K3 PTT input (mic jack and rear panel are in parallel),
connect the other input to KeyOut (or KeyOut LP if you are using the
ACC jack) and connect the output of the NOR gate to the PTT Input of
your WW2R/G4FRE board or the current PTT logic.

73,

    ... Joe, W4TV


On 8/28/2013 4:59 AM, AD6XY wrote:
> Thanks everyone for the most useful suggestions. I have now determined that
> the semi break in delay only works when VOX is activated, so if you are
> using PTT, which I was, and you press the memory button, there is no delay
> and the PTT output rattles up and down. With VOX activated the hang time is
> asserted.
>
> Fortunately, VOX is mode sensitive, i.e. CW and SSB are set individually so
> one can live with this. I don't understand why you need VOX for Semi break
> in to work, but that's how it is.
>
> The TX suppression is a good thing to have, but in my case it is handled in
> the transverters. The TX power is only 1mW and it goes straight into the
> mixer. At that power level it hardly matters if the input pin diodes or
> relays are hot switching. What does matter is the settling of the output
> TX/RX relays and this is OK because I switch the PA bias with a 100mS delay
> so they don't see power until they have had time to settle.
>
> A rapidly changing PTT out status is a problem for my system because, a lot
> is going on in the TX/RX changeover. There are bias supplies and drain
> supplies to switch and a rapid on/off could defeat my relatively simple
> sequencing logic. This takes about 100mS and if the PTT drops part way
> through and then rises again just after, it could result in hot switching.
>
> There is a useful K3 option to delay TX by up to 60mS to allow for
> amplifiers to switch. I am using this as well, just in case.
>
> In the unlikely event anyone is interested, I use one of WW2R/G4FREs band
> selection boards to provide a 12V signal for
> 4m/2m/70cm/23cm/13cm/9cm/6cm/3cm band. It monitors the K3 RS232 line. It
> also provides band by band PTT but I don't use that facility, I gate a
> single PTT line via the 12V per band.
>
> In the shack I have two of W1GHZs miniverters, one for 2m and one for 70cm
> which provide the interface to the microwave transverters. These share a VHF
> Apollo local oscillator which develops 116 MHz or 404 MHz as required. Some
> simple diode/relay logic selects which IF, LO and microwave transverter is
> activated depending on the microwave band. It is designed for 23/13/9/6/3cm
> but currently only 23/13/9cm are on the mast.
>
> My microwave transverters are located 20m away, at the base of my
> lightweight Tenamast to cut down on cable losses. The 12V per band and PTT
> signals are decoded with relay/diode logic. I have 1:6 relays at the top and
> bottom so I only need one TX and one RX feeder up the mast. This saves much
> weight and each feeder is only 10m long. As the pre-amps and band select are
> all in a box at the top, I can use a lightweight LMR400 for the RX line. The
> TX line is LDF4-50, LDF5-50 would have lower loss but it is not flexible
> enough.
>
> Apart from raising the mast, this is all completely automated, (potentially
> controllable via the internet if only I had a decent broadband connection)
> and it does not interfere with HF/VHF operation.
>
> Mike
>
>
>
>
> --
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