Topband: NCC-2 antenna pattern?

[Pete Smith N4ZR]

If you can get that close I suggest a small explosive charge

73, Pete N4ZR

On 12/17/2023 10:31 AM, John Kaufmann via Topband wrote:
> If you are going to use the NCC-2 to null a nearby in-band transmitter, I think it's very likely that the NCC-2 will get overloaded by the extremely strong RF and not be usable.  I've tried this before and found that to be the case.  In fact, I designed my own totally passive nuller to get around this problem.  It worked and was able to create very deep nulls on an in-band transmitter, but turned out to be very impractical because it required constant adjustment to maintain a null as antennas were changed or rotated.
>
> The other thing to consider is that if the interference is coming from the same direction as a signal you want to hear, nulling the interference will also null the signal. Nulling works best when the interference comes from a very different direction than the signal.  It also helps greatly if the interference sensing antenna receives the interference much more strongly than the main antenna.  This can be done by placing the sensing antenna close to the interference source, if that's possible.
>
> 73, John W1FV
>
> -----Original Message-----
> From: Topband<topband-bounces+john.kaufmann=verizon.net at contesting.com>  On Behalf Of Kenny Silverman
> Sent: Saturday, December 16, 2023 10:05 PM
> To: Rick Kunath<k9ao at yahoo.com>
> Cc: topband<topband at contesting.com>
> Subject: Re: Topband: NCC-2 antenna pattern?
>
> Rick, my application is for an in-band RX antenna, but on a higher band. I just thought the guys here might know more about the NCC-2, MFJ or QRM eliminator than most others.
>
> One thought was to create a 2 ele phased vertical array for the RX antenna with a known pattern and put the null towards the TX array, along with physical separation to allow in-band receiving.
>
> But I was thinking an adjustable phasing system may produce a better null. But I wouldn’t want the adjustable unit to create a clover leaf pattern for example. One null might take out the interference but another null towards the desired receiving direction might be created and is not desired.
>
> I hope I’m explaining this well.
>
> Regards , Kenny K2KW
>
>> On Dec 16, 2023, at 9:47 PM, Rick Kunath<k9ao at yahoo.com>  wrote:
>>
>> What's your application Kenny and what would you be feeding the antenna output of the phaser into?
>>
>> Rick Kunath, K9AO
>>
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