2SK datasheet, 2SK circuit, 2SK data sheet: UTC – HIGH FREQUENCY AMPLIFIER N-CHANNEL SILICON JUNCTION FIELD EFFECT. 2SK Datasheet PDF Download – HIGH FREQUENCY AMPLIFIER -CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR, 2SK data sheet. 2SKLK53 from NEC Corporation. Find the PDF Datasheet, Specifications and Distributor Information.
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I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight.
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I have mentioned a local one in the misc links section. Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance.
The shifted 75m coverage also means that the respective input tank circuit is peaked at instead of kHz, which does not make all that much sense given that actual stations are typically found 2s,508 about to kHz. Incidentally, the venerable ICFW isn’t a Wadley receiver either, just an almost “normal” dual conversion rx with a tuned front-end and bipolar balanced mixer, btw that reuses some FM IF filters for the 1st SW IF, with a crystal-based marker frequency generator kHz and a slightly and precisely adjustable 2nd LO datwsheet thrown in.
The resulting versions are:. While I guess that it won’t make a night-and-day difference, you may want to re-peak L3 at about kHz, preferably when you’re working on such a set anyway. The critical part in terms of drift remains the 1st LO.
If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. The first one in particular was not minor, indicating that several bugs had to be worked out.
This, BTW, uses a 2SKY FET and a variable mixing frequency that’s what you vary with the main tuning knob — a “digital”, by contrast, has a constant 2nd mixing frequency since the frequency variation part already took place one IF earlier.
The receiver features no less than four front ends: These days, this receiver concept really is something for weaker signal areas only, and I would therefore hesitate to recommend buying a new receiver using it they typically do seem to have fairly good selectivity though.
And in fact, I think that much improved readout accuracy and improved stability were the main reasons for choosing this concept over a classic single conversion one, along with better image and spurious rejection. For FM and MW, this turns out to be fairly simple, signals from the whip antenna or ferrite rod antenna, respectively, are fed virtually directly to the CX mixing, demodulation and audio amp IC I wouldn’t be surprised if it also contained a function for walking the dog, hiwhere they’re mixed to Sounds easy — however, fairly comprehensive disassembly will be required to get to this point, which is not entirely trivial see the next section as well as the linked Japanese page.
Partly but not solely due to all the different versions, the service docs are pretty thick, in stark contrast to the ‘s minimal service manual! This is done by adjusting RV2 a trim pot near the upper right corner of the main PCB’s component side so that a voltage of 1. The original service manual bears a coppyright date of Combining a wideband frontend with an unbalanced first mixer — as found in these inexpensive sets — is not a very smart thing to do, as 2nd order intermod quickly becomes a major problem.
This is far as I went with the dis-assembly, but it was obvious that all you have to do to strip the set completely, is unsolder the wires to the speaker and leave it behind, glued to the front panel.
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In this form, it cannot reach the same raw reception performance as a “normal” dual conversion concept; this would have required both a tracking filter on the 1st IF and a beefier 2nd mixer. There is no mechanical reason to remove the speaker from the case. This had me puzzled for a while. Not that much of a battery hog. There is a screw between the lower edge of the board and the battery compartment to be removed.
I bought a used ICF in Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz.
Created yyyy-mm-dd Last revision If you want to go further, unplug the ribbon cable and fold the board back. Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. It had apparently been someone’s workshop radio, judging from the huge dwtasheet of brownish dust inside and several paint sprinkles outside.
If you need a service manual in paper form, there are various sources that sell ’em. Here’s a complete scanned service manual for the ICF After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.
Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up.