[Premium-Rx] Sub-Octave Filters for RA3701

[sm0aom at telia.com]

A 6 or 10 dB insertion loss would also concern me.
The sub-octave filters, including the RF overload protection Circuit
in the SRT CR30x and CR90/91 has a typical insertion loss of less than 1 dB.

The preselector option in the Telefunken E1800 and the SELEX SP2296 has an insertion loss of about 2 dB.

73/
Karl-Arne
SM0AOM

----Ursprungligt meddelande----
Från : cpaul at gmx.net
Datum : 2017-05-19 - 21:08 (UTC)
Till : premium-rx at mailman.qth.net
Ämne : Re: [Premium-Rx] Sub-Octave Filters for RA3701

Hi Chuck and Ian,

>I would expect 6dB or even 10dB of loss 
>without being too concerned.

I don't know the Racal specs either but would be definitely concerned though
if a suboctave filter had 6dB or even 10dB insertion loss.
E.g. the R&S R&S®FK-890H1 (passive) input filter unit for the EK890/896
which comprises a lowpass filter, a bandpass filter and eight suboctave filters 
is specified with an insertion loss of < 1dB.

73
Clemens
DL4RAJ  

>-----Original Message-----
>From: Premium-Rx [mailto:premium-rx-bounces at mailman.qth.net] 
>On Behalf Of Chuck Urmson
>Sent: Thursday, May 18, 2017 5:07 PM
>To: premium-rx at mailman.qth.net
>Subject: Re: [Premium-Rx] Sub-Octave Filters for RA3701
>
>Hi Ian,
>
>I don't know what the insertion loss specifications are but since the 
>module is completely passive I would expect 6dB or even 10dB of loss 
>without being too concerned.  I imagine the BITE tests do some 
>checking 
>-- do they pass?
>
>Regards,
>Chuck EA8DBU/M1DPD
>
>  Democracy is really inconvenient.  I vote we ban it.
>
>On 17/05/2017 20:55, Ian Ropper wrote:
>> Hi,
>>
>> I have a couple of S-O Filter modules for the 3701 and 
>notice a sizeable
>> drop in signal strength when the module is enabled in the 3701.
>>
>> Bot modules exhibit the same drop . the attenuator in each 
>unit is set to
>> 0dB.
>>
>>   
>>
>> Does anyone know the exact details on these units?
>>
>>   
>>
>> Cheers,
>>
>> Ian, GM0UHC
>>
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