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R: Re: Re: RF out with RF OFF: Clock feed through

Ambro IW2FVO
 


Hi to all,
is the Coilcraft WB1015 suitable for this application in place of the T1-1T from Minicircuit ?
Thanks 
73, iw2fvo

----Messaggio originale----
Da: PHSNA@...
Data: 11-lug-2017 14.05
A:
Ogg: Re: [PHSNA] Re: RF out with RF OFF: Clock feed through



----Messaggio originale----
Da: PHSNA@...
Data: 11-lug-2017 14.05
A:
Ogg: Re: [PHSNA] Re: RF out with RF OFF: Clock feed through

 

The problem that we are dealing with is the 180 MHz clock feedthrough in the output. It was discovered when turning the RF off, but it is present with the same amplitude when it is on, where it matters. RF is turned off for special purposes only, not while measuring, and for me it is ok as is.

BTW, I plan to test the transformer method, as indicated by Clifford and also used in some versions with the Chinese modules and in the experimenters board. I have to get a Minicircuits T1-1T transformer for best results, and this will not happen until September.

73 de Ignacio EB4APL


El 10/07/2017 a las 22:28, wb4jfi1@... [PHSNA] escribió:
 
Perhaps a better way to turn OFF the RF would be to put the DDS chip in sleep mode, NOT to just program it to 0Hz.  IIRC, putting it to sleep also powers down the internal clock multiplier (AD9851).
73, Terry, N4TLF


Posted by: wb4jfi1@...