The Sony ICF-2010 radio - sensitivity

[@oasishut3120]

Thats so informative...thanks a lot..where are you located..1620 is some me station or you generated it from signal generator

[@analogwings]

You have to tune the radio to 1620 kHz (usually that frequency has no broadcasts on it). No need for a signal generator. You are trying to ascertain noise level on an unoccupied frequency at the boundary of two AM bands (MW and SW) which is the case for this radio.

[@ArapanPramanik]

When i tune my sony icf 2010 to a fm station lets say the original frequency of the station is 91.5MHz but my radio will tune it at 91.55 MHz. Any idea what is the issue?

[@analogwings]

It's not possible to tell on FM if your internal oscillator is off. The phase-locked-loop (PLL) will get pulled to the correct frequency that is determined by the carrier which is at precisely 91.5MHz. You can use the sync function on AM to see where it switches between the upper and lower sideband on a strong AM signal. That will give a better idea of your radio's tuning inaccuracy.

[@ArapanPramanik]

@@analogwings yes i used sync to check tuning accuracy on am and it is totally accurate. Only fm has this issue all other receivers tune perfectly at 91.5 but sony tunes at 91.55 my radio was fully restored with new capacitors and new narrower fm filter maybe that is the reason i don't know.

[@analogwings]

Section 3 of the service manual goes into some detail about IF alignment and other oscillator frequency adjustments for FM. You will need to open up the radio and probe some internal test points.