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Seeking advice for ¡°upping my receive game¡± during Field Day Contest operation this coming summer. ?On Field Day, multiple operators are usually grouped physically (and socially) close but some don¡¯t always respect band schedules & bandpass filters and which means I generally I can talk better than I hear hear because of interstation receive interference.

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On FD I transmit 20-10M bands using a 17¡¯ vertical + Base autocoupler + directional radials all mounted at 10¡¯ AGL that gives fine directional transmit but my receiver is overloaded with other on-site contestors.

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I¡¯m wondering if a receive-only loop located as far away from other antennas (up to 1000¡¯ allowed) and taking advantage of loop directionality might help?

1. ??? -? Would commercial 1M receive loops be directional enough on 10-30M to be helpful?

2. ????? -Would locating the loop to the edge of the 1000¡¯ contest area, far away from other Hams, be woth the effort?

3. ???? - Would the LZ1AQ likely function OK over that 1000¡¯ length of CAT interconnect?

Or, maybe a better approach is the rather expensive DX Engineering NCC-2 Receive Antenna Phasing Systems DXE-NCC-2 to null out local noise with a 2^nd local-only antenna? ??

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I¡¯d appreciate anyone¡¯s experience or ideas!

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73¡­´³´Ç³ó²Ô

Hi John,

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I think any active antenna is going to be problematic in a field day environment, especially with simultaneous, high power operation on multiple bands.

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In this instance, I'd suggest that a passive tuned loop (not using varicaps) may be more appropriate, as it would provide additional band pass filtering, and not be so easy to overload.

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A remotely located receiver or SDR may be a better option, but would most likely infringe contest rules.

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Regards,

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Martin

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On Thu, Jan 30, 2025 at 01:01 AM, SparkyG / NQ6Q wrote:

In my experience, the null depth of a 1m loop deteriorates at and above 14MHz.? A smaller dual coplanar crossed loop (2x0.5m) helps on 20m, but is still not very directional above that.

Phased vertical arrays maybe?

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73, Mike AF7KR

Less money RSP duo SDRplay RSPduo dual SDR receiver 1kHz-2GHz
only €288 Example

or

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