Sunday, 21 October 2018
Flexradio PTT fault in CW mode
All radios when sending cw with PTT enabled (no full or semi break-in delay) have cw sidetone alone coming out of the speaker to allow the user to hear what they are sending. Flexradio have decided that this is isn't enough and have filled the gaps between the sidetone with receiver hiss. No antenna is actually connected to the receiver during this time, but the engineers at Flexradio think it sane to decode the receiver open circuit anyway. Flexradio engineers fully engage with the full and semi break-in brigade (rag-chew, DXers, occasional contester) as this category covers 99% of the user base. These modes are useless for serious contesting, let me explain why:
Flexradio Full break-in (really useless):
1) CW contesting is normally done with an amp over a 48 hour period of approx 50% duty cycle tx. This kind of usage will shorten the life of the tx/rx switching mechanism dramatically for both radio and amp.
2) When running a frequency I have no need to hear between my transmissions as those heard are mostly slow or poor operators.
Flexradio Semi break-in (useless):
1) A delay is used to stop the radio unkeying between each cw element and character. This saves the tx/rx switching mechanism somewhat (if set correctly), but unfortunately this delay is also added to the end of the transmission where I want to be listening for fast return callers.
2) If I need to vary my cw speed the delay must also be adjusted. Not good for multi-op contests.
Let me now explain why computer PTT or manual footswitch PTT is best:
External Winkey/Footswitch PTT (brilliant):
1) When sending via my computer, it knows when the end of the stored message is coming and can remove PTT immediately allowing me to hear fast return callers.
2) When sending via my paddle (external K1EL winkey), its hang-time parameter is sufficient to save the tx/rx switching mechanism.
3) The hang-time delay parameter of my winkey changes value automatically with speed.
With Flexradio implementation of what to do when PTT is applied, the operator has to listen to the following for a sent "CQ":
long sidetone, false hiss, short sidetone, false hiss, long sidetone, false hiss, short sidetone, false hiss, long sidetone, false hiss, long sidetone, false hiss, short sidetone, false hiss, long sidetone, false hiss, real rx hiss.
You can imagine how annoying this is going to get over a 48 hour period. Sure you can dial in some flexradio delay to get rid of the false hiss but then you get the above semi break-in disadvantages. Numerous users have reported this fault to Flexradio, but they think they know better...
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment