Posted by
w5tvw on
Nov 19, 2011; 11:11pm
URL: http://elecraft.85.s1.nabble.com/US-60-Meter-Band-Changes-Approved-by-FCC-CW-Issues-tp7012018p7012308.html
You CAN do it that way...BUT.....if you do....BE careful. If you make a
mistake it may be costly to everyone who uses the band. I'm sure they will
be doing at least a "sample monitoring" session during the early days after
the allocations are final. THESE ARE "CHANNELIZED" frequencies and they
have a tendency to be sure you are compliant with their "rules"! They may
not be, but why take a chance. It's too easy to be in the wrong place at
the wrong time.
I'd imagine SOMEONE is gonna be a bit "touchy" the first few weeks after
this goes into effect. If you have the memories..USE THEM! No "offense"
meant by above remarks!
73,
Sandy W5TVW
-----Original Message-----
From: Mike Harris
Sent: Saturday, November 19, 2011 4:38 PM
To:
[hidden email]
Subject: Re: [Elecraft] US 60 Meter Band Changes Approved by FCC - CW Issues
Maybe I'm missing something but isn't this what the VFO knob is for.
Set the dial frequency to 5357kHz for USB, change to CW and set the dial
frequency to 5358.5kHz
Regards.
Mike VP8NO
On 19/11/2011 18:47, Mike Morrow wrote:
> Sandy wrote:
>
>> The CW signal must be radiated on the center frequency. This won't make
>> ANY
>> difference except that you will have two memory settings for the same
>> channel. One for SSB and data and RTTY modes, and one for CW mode which
>> will simply occupy 10 memory slots.
>
> The point to be taken is that most HAM transceivers, when the emission
> mode is
> changed from USB to CW, shift either the effective receive or the transmit
> frequency by the desired amount of sidetone frequency. They don't shift
> both
> the effective receive AND the transmit frequency. For example, a
> transceiver
> tuned to 5357.0 kHz on the dial in USB mode will produce a zero Hz AF
> output
> when receiving a transmitted signal of 5357.0 kHz, and a 1500 Hz AF output
> when
> receiving a transmitted signal of 5358.5 kHz. When the transceiver is
> shifted
> to CW mode, the receiver frequency typically remains 5357.0 kHz, while the
> transmitter frequency is shifted up to typically 5357.8 kHz (for 800 Hz CW
> sidetone). But the new FCC rules require that the CW transmit frequency
> be
> 5358.5 kHz, which will produce an undesirably high side tone to any USB/CW
> mode
> receiver set to 5357.0 kHz. If you are in a USB phone QSO on 5357.0 kHz,
> anyone
> sending a CW signal on that channel must do that using 5358.5 kHz. The
> phone
> boys will hear not the typically 800 Hz sidetone, but rather a high 1500
> Hz
> sidetone!
>
>> If the FCC engineers want to hear a 1.5 khz tone, that's THEIR problem,
>> not ours.
>
> That's got NOTHING to do with the discussion.
>
> The new 60m rules will mandate that a CW signal be sent 1500 Hz higher
> than
> the USB carrier frequency on the assigned channel! This is the FIRST
> REQUIREMENT of this type in ALL of the history of ham radio. There are NO
> ham rigs today that are set to implement this requirement when, while set
> to
> to 5357.0 kHz, the mode switch is shifted from USB to CW!
>
> Beyond that, since most hams will not be happy with normal use of a 1500
> Hz
> sidetone on 60m, new ham rigs will also need to shift the receiver
> frequency
> higher than that being used for USB phone mode, in order to produce an 800
> Hz
> (or so) sidetone after the mode switch is taken from USB to CW.
>
> So...nothing in this discussion concerns any FCC desire for a particular
> receiver sidetone, but rather, additional issues that must be addressed
> by ham rig designers for multi-mode 60m operation that are significantly
> different than have ever been encountered.
>
> Mike / KK5F
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