[hpsdr] ANAN-10 28MHz generated birdie

[Helmut]

Ralph,

 

the most important question is: Can you detect any significant birdie in the
mentioned offset or a drifting carrier on the 10 m band. Of course we do
have some spurs or harmonics (mostly outside the ham bands) e.g. of 25 MHz
Ethernet controller Xtal etc. When you mix this spectrum with 116 MHz of
your 2m transverter or even with another LO frequency of 96/106 Mhz for the
micro-wave bands you shouldn't be surprised about some 'strange' carriers.
When these carriers are dramatically drifting you should look for a SMPS
device as causer.

 

Successful hunting!

 

73, Helmut, DC6NY

 

Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Ralph
Gesendet: Samstag, 6. August 2016 13:00
An: hpsdr at openhpsdr.org
Betreff: [hpsdr] ANAN-10 28MHz generated birdie

 

I have had the same problem of a wide drifting birdie in my 144MHz receiver.

As I use the ANAN-10 to drive 144MHz transverters from 28MHz this gives me
the IF

to use my DB6NT microwave transverters

(I Have used various good quality 28-144MHz transverters with the same
result)

 

It appears almost immediately on switch on and is noticable at the bottom
end

of 144MHz which is my IF for Microwave bands. Drifting LF from about 144.150

down.

The ANAN-10 I have was bought a few years back, direct from Apache Labs
India.

and noticed from the first time I used it it had this Birdie. I thought it
may have

been picked up locally from some source or other, but When Dom mentioned it

I realised it was not just my set-up or local RF environment.

73

Ralph G4ALY

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