Look for their call in ALL.TXTĪvoid Field Day weekend (this weekend), as the bands are very busy, everyone's using 'FD mode', and everyone else is doing everything above 'wrong'. Watch the progress of other QSOs, see if other people are working your QSO partner successfully. I've ruined QSOs too many times with "Oh, he can't hear me on 1500Hz, try 500Hz, no, wait, he responded to my 1500Hz transmission, switch back to 1500, now he's responding to my 500Hz".
ICOM 756 PRO II SETUP FULL
A full QSO can take a couple of minutes, don't rush it. Combine with the above, set your Tx frequency to 3000Hz and see what you get.ĭon't get impatient, if you don't get an immediate response, let your radio transmit a few more times. Even when 'nothing has changed' your antenna connections might be loose, or corroded,or worn in some other way. I see signals on the waterfall that start strong and fade away, and often wonder if those rigs (or power supplies, or antenna tuners, or other parts of the system) can't take the load.Ĭheck for RFI. Your QSO partner will read you at -12 instead of -10, but it'll still work.Ĭheck your antenna VSWR, see if output power is consistent during your transmissions. Back off by a couple dB on your transmit audio, yes your output power drops a lot, no it doesn't make a huge difference in decoding, and can eliminate all sorts of overmodulation problems.
Make sure your microphone's not inadvertently active. Make sure your computer's not sending other audio to the 'radio' sound card. Set all your filters as wide as possible, disable all audio processing. Make sure your Tx and Rx audio chains are properly set up. You don't have to get that carried away, but don't be afraid to move around if you've transmitted on one frequency 3-4 times and it's not working.
ICOM 756 PRO II SETUP CODE
I wrote some Python code to go through the last couple of minutes of ALL.TXT and see what frequencies are actually in use, as separate from what's visible on the waterfall. Set Split Operation to "Rig" or "Fake It" so that you are always transmitting in the middle of your passband, set all your filters as wide as possible, and try for a clear spot in the passband near but not on their frequency, as their Rx passband may not be very wide. Try different Tx (audio) frequencies in the passband. Make sure "Hold Tx Frequency" is checked so you (along with everyone else) don't move to your QSO partner's Tx frequency. Your transmit frequency is experiencing QRM on their side. Your time is off enough that they aren't decoding you reliably. Try working strong stations first to get some confidence in your setup. While I can _hear_ stations down to about -24, I can only reliably _work_ stations down to about -15. If the amplifier is not ready when the RF begins relays may be damaged and the transmitted signal will have an extremely fast rise time producing spurious signals (splatter or key clicks) and if the amplifier is too slow when switching out of the circuit the radio will be sluggish on having the antenna connected for receive and you will miss the first syllable of speech or the first character on CW.You could be chasing stations too far away, with marginal or fading signals. As the following drawing shows the amplifier is given time T3 (or T3-T2) warning to get in the circuit on transmit and the radio goes back to receive T7 after the RF stops. The CW key line is shown but is not important to understand the timing as it follows the HSEND line very closely and obviously has is not applicable to any mode other than CW.Īmplifiers are generally controlled via the Send Control jack which is a bare relay contact but may also be controlled via the HSEND output driving an external buffer device. The HSEND line is both an input and output but when it is low the radio is in transmit mode and when it is high the radio is in receive mode. The drawing below shows the basic timing external to the radio. The amplifier (or any other devices that may be switched in or out) must be in the circuit BEFORE any RF begins and must not be switched out of the circuit until the RF has totally ceased and then need to be switched out quickly.
The timing of this switching is important if we expect relays to not be damaged and if we want our transmitted signals to be spectrally clean. Since almost everyone uses the same antenna for both transmitting and receiving, an external amplifier must be switched in and out of the circuit when going from transmit to receive. The following measurements were made on some Icom radios and an Elecraft K2/100 but all radios have the same issues.
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