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LF: 73kHz Cross-band

To: [email protected]
Subject: LF: 73kHz Cross-band
From: "James Moritz" <[email protected]>
Date: Tue, 21 Mar 2000 14:49:16 +0000
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
Dear LF Group,
Sent CQ calls on 73kHz from about 1910 to about 2250 last night; saw signals from G3LDO and G4GVC while monitoring 73kHz, but no replies on 136kHz - only signal seen was DFCW from G3AQC. The level of QRN seemed quite high.

I think the idea of having seperate frequencies for each station on the band is a good one - I would go along with G3LDO about 'channel spacing' - maintaining my VFO to within +/-5Hz is fairly easy, which would be OK for 10Hz spacing, but not for 5Hz. I will allocate myself 71.81 for the time being, unless there is any reason to avoid this frequency?

As far as switching antennas goes, I am using a seperate antenna for receive when working cross-band - this avoids problems with high-voltage switching. The RX antenna is a vertical of about 5m fixed to the side of the house, tuned with a small pot core inductor and variable capacitor. At the moment it is switched out by a relay on transmit, but I plan to add some additional high pass filtering so I can monitor 136 continuously while transmitting on 73. The seperate antenna seems more prone to picking up mains noise, but most of the time the noise floor seems to be QRN or Loran sidebands.

I probably won't be available tonight, but should be QRV tomorrow morning for cross - band QSO's.

Cheers, Jim Moritz
73 de M0BMU


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