No, HK0NA was rather heavily oriented to CW and SSB operation early in their time on the island. It was not unusual to hear them on both CW and SSB across four or five bands with nary a signal on RT
The only problem with using 915/1015 (1 KHz) or any other "low" audio tones with AFSK is the chance that over driving the microphone input of the transceiver will produce harmonics that will get tra
Are you sure that applies to transmit bandpass? Every Flex I've heard has been excessively wide. By the way, the Elecraft K3 has an optional post modulator filter for AFSK (CONFIG:AFSK TX). Its steep
It's not typically voltage punch through to the active devices that kills front ends ... except for switching diodes that can be damaged will less than 1/4 volt depending on type and how they are bi
Just like computer logging, memory keyers, Super Check Partial, voice keyers, and the "arms race" with ever bigger antenna systems and larger amplifiers have already ruined contesting, eh? This is a
I believe you will find that N1MM Logger supports the KAM/KAM Plus as an "External TNC". See the on-line documentation at: <http://n1mm.hamdocs.com/tiki-index.php?page=Digital+-+External+TNC+Support>
They're still being bloody pigs to expect an exclusive 1 KHz wide guard band in the middle of the RTTY segment of the band. If they don't want interference from RTTY move the stupid beacons down to 1
SB QST @ ARL $ARLB006 ARLB006 NTIA: No Objection to Additional Data Modes on 60 Meters ZCZC AG06 QST de W1AW ARRL Bulletin 6 ARLB006 Newington CT March 29, 2012 To all radio amateurs SB QST ARL ARLB0
There is nothing in the requirement that one actually *copy* USB. One must avoid interference but that cuts both ways ... USB users (other than the authorized agencies) are not permitted to interfere
The K3 does true FSK ... it's done using DSP to create the signal directly at the IF. 73, ... Joe, W4TV _______________________________________________ RTTY mailing list RTTY@contesting.com http://l
While you may have the technical "chops" to do proper frequency shaping and filtering to generate an AFSK signal that is better than most "FSK" transmitters, the vast majority of users - even many wh
Yes ... No, it is generating and shifting one tone ... taking two alternating external audio signals and mixing them with a 15 KHz carrier in a balanced modulator (even a numerical balanced modulator
No, what I mean is AFSK with individuals who don't know what they're doing is just plain crap and there are far too many individuals who either don't know what they're doing or don't care what they'
Not to mention saturating the receiver IF or causing the AGC to reduce the receiver gain to the point that a weak signal falls below the noise floor, etc. There are a lot of benefits for narrow filt
It also means one device can be used for both receivers in a dual receive (SO2V) or SO2R installation. 73, ... Joe, W4TV _______________________________________________ RTTY mailing list RTTY@contest
- snip - The problem with this is they *cause* a different kind of problem - one that acts and sounds like RFI. By providing a DC return between the radio chassis and ground *through* the computer (
If Jim doesn't, Jack Smith K8OZA has them on his web site. I believe Elecraft have a version of the Line Out board that uses the Bourns transformers - at least there is reference to them in the late
However, Fldigi does not support FSK (other than the keyed tone "pseudo FSK"). 73, ... Joe, W4TV _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.co
With a theoretical bandwidth of around 340 Hz for 170 Hz shift 45.45 baud FSK, one could get as close as 18,109.9 (MARK). For USB dial frequency (AFSK), one would want to stay below 18,110 - MARK -
Chen, Thanks for the empirical confirmation. When I posted my original reply the 340 Hz value was from memory rather than bothering to consult the ITU (also NTIA "Appendix J") documents. For the bene