[Premium-Rx] Fw: Telefunken E1800/3 vs E1800

[Karl-Arne Markström]

Usually the modulation or spurious sidebands and/or the noise properties of 
the interfering signals limit the
practical useability of very high IP3 front ends.

A +46 dBm IP3 implies a IM limited dynamic range in the order of  115 dB in 
CW bandwidths, and I have yet to see a fielded transmitter with more than 
90 - 100 dB adjacent channel suppression. Should you operate in a 
multi-transmitter environment, all bets are off regarding where the IM 
products will be generated.

73/

Karl-Arne
SM0AOM

----- Original Message ----- 
From: "Michael O'Beirne" <michaelob666 at ntlworld.com>
To: "PREMIUM-RX" <premium-rx at mailman.qth.net>
Sent: Saturday, December 12, 2009 1:05 PM
Subject: [Premium-Rx] Fw: Telefunken E1800/3 vs E1800


> Morning guys
>
> Heinz's info from the 11th December is (as usual) most interesting but
> seriously unless you are within spitting distance of a 1kW transmitter or
> stuck on a warship is there any real perceptible difference between a
> receiver with an IP3 of +36dBm and one of +43dBm?
>
> 73s
> Michael
> G8MOB
>
>
> ----- Original Message ----- 
> From: "Heinz Breuer" <hbreuer at debitel.net>
> Cc: <Premium-Rx at mailman.qth.net>
> Sent: Friday, December 11, 2009 8:28 PM
> Subject: Re: [Premium-Rx] Telefunken E1800/3 vs E1800
>
>
>> Singer has a datasheet for the 1800 he offers on his website.
>> http://www.helmut-singer.de/fix/she.html
>> klick on datasheet HERE
>>
>> The 1800 datasheet states an IP3 of 36dBm and the seller of the 1800/3
>> on eBay states 43dBm with the upgraded HT1710/3 rf module.  This is
>> without preselector and for 30kHz offset, probably lightyears ahead.
>>
>>
>
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