13-02-2020, 08:59 AM
(This post was last modified: 13-02-2020, 09:01 AM by ppppenguin.)
As Andy says, these are relatively cheap and cheerful generators, not precision instruments. I really don't think it's worth trying to use modern trickery to achieve better accuracy. The stability of the generator with time and temperature would probably make such an exercise worthless.
Tracking, in the sense of aligning a superhet receiver, is trying to align the local oscillator not only with the dial markings but also with the RF tuning. A slightly more complicated problem than aligning a signal generator.
You sy the coils are air cored. Are they on formers or in air? if the latter the turns can be squeezed up or opened to adjust the inductance.
In the absence of formal alignment instructions I would start at the lowest range and get that as correct as possible with the main trimmer across the tuning gang. You may need to go up and down the band a few times to spread the errors. Then work up the ranges using the individual trimmers. Again you may be repeating this more than once to spread the errors evenly across all bands. But it might be better starting a the highest end and working down.
if you want a really accurate signal generator then you need to buy something rather better than an E2. If you're just alignng radios and TVs then the E2 is good enough. Even with an E2 or other simple SG then you can always use a counter to set accurate frequencies, something that wasn't available when these SGs were new.
Tracking, in the sense of aligning a superhet receiver, is trying to align the local oscillator not only with the dial markings but also with the RF tuning. A slightly more complicated problem than aligning a signal generator.
You sy the coils are air cored. Are they on formers or in air? if the latter the turns can be squeezed up or opened to adjust the inductance.
In the absence of formal alignment instructions I would start at the lowest range and get that as correct as possible with the main trimmer across the tuning gang. You may need to go up and down the band a few times to spread the errors. Then work up the ranges using the individual trimmers. Again you may be repeating this more than once to spread the errors evenly across all bands. But it might be better starting a the highest end and working down.
if you want a really accurate signal generator then you need to buy something rather better than an E2. If you're just alignng radios and TVs then the E2 is good enough. Even with an E2 or other simple SG then you can always use a counter to set accurate frequencies, something that wasn't available when these SGs were new.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
