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Dear 60M JT65a Users,

Please rememeber that you may only use the channel CENTER frequency and there may only be one QSO at a time on each channel. This applies to all modes including JT65A.

Check Part 97.303h and read the following letter from the NTIA to the FCC if you need clarification:

http://apps.fcc.gov/ecfs/document/view?id=7021871884


JT65A is 174.9 Hz wide with the 1270.5Hz SYNC frequency on the LF edge. So if you set JT65HF to transmit with an offset of zero you will be transmitting between 1270.5 and 1445.5 (1270.5+174.9) Hz above your suppressed carrier/dial frequency. The center of your transmission will be 1357.95 (1270.5+174.9/2) Hz above your dial frequency. Since the center of each 60M channel is 1500 Hz this results in you being 142.05 Hz too low.

To correct this, set your offset on JT65HF to +142 Hz.
If you use WSJT-x simply set the offset to be 1412 Hz.

There is no definitition regarding how close to the center frequency we need to be but with modern day rigs there should be no reason why we can't get our 175Hz signal to straddle the channel center.

About me:

First licensed in 1972 as G8GSG. I was very active on 2M AM from Herstmonceux in Sussex, England in the mid 70s. Moved to London and could be heard on 2M SSB and FM from various QTHs including Wandsworth, Hammersmith, Earls Court and Kew.

Moved to California in '86 after taking my UK CW test and becoming G0ERY. Active in California on 2M and HF as W6/G0ERY.

Took my U.S. tests (all of them) on March 3rd, 2001 and became AD6VT.

Replaced that with the vanity call K6RBS (my initials).

Current equipment is an FT950, AL572 Amp (with 4 Taylor 572Bs), Heathkit SA 2060 tuner and a G5RV @ 50' fed with ladder line.

I'm not an audio fanatic (folks running 4.5Khz wide ESSB drive me crazy - nobody needs to take up that much real-estate on the band).

I do however,like to hear and hopefully send crisp, clean audio that isnt excessively wide.

I use an W2IHY EqPlus box to add a little EQ, compression and downward expansion (to hide the fan noise from the AMP).

EQ in the radio is set to remove the muddy bass around 400hz and boost the highs.

The processor is on but reduced to 10%.

TX bandwith is set to 2.8 Khz for rag chewing (2.4 for contests).

My mic is an Audio Technica AT2020 (available from Guitar Center). It does require phantom power but it is an amazing mic for the price (< $100).

The MIC has no PTT switch so I use a foot switch from a Electronic Keyboard. I have an an FT857 which I use for backup and VHF/UHF.

I enjoy chasing DX and contesting as well as T hunting.

I need lots of States and Countries for WAS and DXCC on the WARC bands... pease call me if you hear me on.

73 de Richard

 

1759864 Last modified: 2015-03-06 19:39:10, 6657 bytes

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