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R3500D - QSY to 160m Top Band

 

Hello all,
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Has anyone converted the R3500D DF receiver for Top Band (1.81 to 1.86 MHz)?
?
I see the SDR Kits manuals mentions the following on that last page ():
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"Note 3: For 1.8 MHz Operation fit additional 150pF capacitor in parallel with C3 and a 39pf
capacitor in parallel with CT. Oscillator Frequency is now the same as Receive Frequency."
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The problem is the LO runs from 1.75 to 1.80 MHz so just outside the 160m band.
?
Any pointers or suggestions welcome.
?
?
73
John GM4JRT
 

¿ªÔÆÌåÓý

John,

The LO has enough margin to cover 1.81 to 1.86 MHz. It said 1.75-1.80 because it was to cover 3.5-3.6 at half frequency.

Thanks,

Adam

ÔÚ 2025/5/12 23:17, John GM4JRT via groups.io дµÀ:

Hello all,
?
Has anyone converted the R3500D DF receiver for Top Band (1.81 to 1.86 MHz)?
?
I see the SDR Kits manuals mentions the following on that last page ():
?
"Note 3: For 1.8 MHz Operation fit additional 150pF capacitor in parallel with C3 and a 39pf
capacitor in parallel with CT. Oscillator Frequency is now the same as Receive Frequency."
?
The problem is the LO runs from 1.75 to 1.80 MHz so just outside the 160m band.
?
Any pointers or suggestions welcome.
?
?
73
John GM4JRT
 

Thanks Adam,
?
I'll give it a shot.
?
?
John

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