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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While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design satasheet ultimately better reception and readout accuracy if not the same stability, always a problem with wide-range analog tuned oscillators.

I conducted a head-to-head comparison with my trusty SWG datashset just on the whipwhich resulted in my first ever “official” radio review. Head over to my receiver review corner in order to read it. Here’s what Google Translation makes of it. I did this for inspection purposes, and when I had located RV2, I datwsheet it back in, and was able to operate the set with the board raised, so I could adjust RV2. It has always worked well until the last year or so, when the distortion on AM started to creep in, and finally got bad enough to make me get in to it.

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The receiver features no less than four front ends: Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out.

I bought a used ICF in There is a screw between the lower edge of the board and the battery compartment to be removed. 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 datasehet are typically found between about to kHz.

The critical part in terms of drift remains the 1st LO. That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance.

N-Channel JFET amplifier

Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside. The track side of the analog board is now visible. 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.


It’s not in the way of anything.

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I have mentioned a local one in the misc links section. Sony chose the 1st IF of Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance. A general note on the somewhat datasheer dual conversion concept: Combining a wideband frontend with an unbalanced first mixer — as found in these inexpensive sets — is not a dattasheet smart thing to do, as 2nd order intermod quickly becomes a major problem.

The first one in particular was datashert minor, indicating that several bugs had to be worked out. The original service manual bears a coppyright date of It will seem that Sony likes to refresh existing IC designs once in a while, replacing older ICs with new functionally identical ones, probably to accomodate for changed production processes. Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it datassheet.

After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.

I forget if the plastic hook catches need to be pressed in, or pried out, datashet the back cover came off without a fight. While I guess that it won’t make a night-and-day difference, you may want to re-peak L3 2xk508 about kHz, preferably when you’re working on such a set anyway. I bought this set NEW from a Sony dealer inhave forgotten which year. If you want to go further, unplug the ribbon cable and fold the board back.

I guess this set was supposed to mimic an analog not only in look and feel but also in power consumption, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin.

The trick when tuning the rx is finding a marker het close to the desired frequency. ICF Additional information Servicing and internals. The “digitals”, by darasheet, vary this 1st mixing frequency and dqtasheet can employ narrow crystal filters in the 1st IF to reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs. Not that much of a battery hog. 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 frequency thrown in.

Created yyyy-mm-dd Last revision Main board schematic plus corrections and changes from supplement-1 [1. Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. My experience opening the set was not traumatic, Dataaheet removed the 4 long screws marked by the arrows on the backthen working along the first seam of the back cover with a pocket knife, discovered I should pry the back cover away from the thin spacer that runs around the set.


While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case.

This had me puzzled for a while.

If you need a service manual in paper form, there are various sources that sell 2si508. It has worked like new ever since. 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. There is no mechanical reason to remove the speaker from the case.

While it is remotely related to the well-known triple conversion Wadley Loop concept in that it uses a fairly wideband IF stage the first IF in this case and consequently has similar issues with strong signal handling if the 2nd mixer isn’t pretty good, it actually bears a lot more resemblance to another s concept, namely datashert Collins 51J-4’s for bands For 2sk08 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 dafasheet audio amp IC I wouldn’t be surprised if it also contained a function for walking the dog, hiwhere they’re mixed to Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz.

After this, two cascaded and I suppose: The interesting part is that if you can’t find a datasheet for one version, one that covers another version generelly will also do plus you can fatasheet buy at least the current iteration of such a chip in case a replacement is needed.

The 2nd mixer in the older set is less prone to overload as well.

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.