Posted by
Matthew Pitts on
Nov 19, 2011; 10:09pm
URL: http://elecraft.85.s1.nabble.com/US-60-Meter-Band-Changes-Approved-by-FCC-CW-Issues-tp7012018p7012191.html
Mike,
This new requirement may not be driven entirely by the FCC; isn't 60 meters controlled by the NTIA? Maybe they are the ones that stipulated the shift in frequency; I don't know.
Matthew Pitts
N8OHU
Sent from my Wireless Device
-----Original Message-----
From: Mike Morrow <
[hidden email]>
Sender:
[hidden email]
Date: Sat, 19 Nov 2011 16:47:34
To: <
[hidden email]>
Reply-To: Mike Morrow <
[hidden email]>
Subject: Re: [Elecraft] US 60 Meter Band Changes Approved by FCC - CW Issues
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
Maybe there will be some "simple
>simon" type doing any monitoring and he will have a "reference" frequency of
>1500 hz. plus or minus what ever the "tolerances" are in PPM. As I said
>this ISN'T OUR WORRY.
>
>Will be nice to have a "CW" place to go that will be unmolested by
>contesters on weekends!
>
>When is this supposed to appear in the Federal Register" anybody know?
>
>73,
>
>Sandy W5TVW
>
>-----Original Message-----
>From: Mike Morrow
>Sent: Saturday, November 19, 2011 2:13 PM
>To:
[hidden email]
>Subject: [Elecraft] US 60 Meter Band Changes Approved by FCC - CW Issues
>
>I wrote:
>
>>(3) Three emission modes (CW, RTTY, Data) are authorized in addition to the
>> existing USB mode.
>
>There's interesting detail about carrier versus center frequency in the
>*new*
>Section 97.303:
>
>---QUOTE---
>(h) 60 m band: (1) In the 5330.5-5406.4 kHz band (60 m band), amateur
>stations
>may transmit only on the five center frequencies specified in the table
>below.
>In order to meet this requirement, control operators of stations
>transmitting
>phone, data, and RTTY emissions (emission designators 2K80J3E, 2K80J2D, and
>60H0J2B, respectively) may set the carrier frequency 1.5 kHz below the
>center
>frequency as specified in the table below. For CW emissions (emission
>designator
>150HA1A), the carrier frequency is set to the center frequency...
>
> 60M BAND FREQUENCIES (KHZ)
> Carrier Center
> 5330.5 5332.0
> 5346.5 5348.0
> 5357.0 5358.5
> 5371.5 5373.0
> 5403.5 5405.0
>---END QUOTE---
>
>Note the *requirement*: "For CW emissions ... the carrier frequency is set
>to
>the center frequency."
>
>For example, switching from USB Phone on 5357.0 kHz to CW on the *same*
>channel,
>the transmitter must transmit on 5358.5 kHz. That will produce a 1500 Hz
>tone
>in a USB receiver set to 5357.0 kHz. It appears that now a transceiver will
>need to shift not only the transmitter's carrier from 5357.0 to 5358.5 kHz,
>but also receiver's effective frequency up by the amount needed to produce
>the
>desired sidetone when tuned to a 5358.5 kHz CW signal. The wording in the
>new
>rule seems to introduce an unfortunate and valueless complexity for CW
>operation.
>
>Mike / KK5F
>
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