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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It’s not in the way of anything.

The receiver features no less than four front ends: I did this for inspection purposes, and when I had located RV2, I plugged it back in, and was able to operate the set with the board raised, so I could adjust RV2. The track side of the analog board is now visible. 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. It has worked like new ever since.

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.

That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance. The original service manual bears a coppyright date of If you need a service manual in paper form, there are various sources that sell ’em. Created yyyy-mm-dd Last revision There is no mechanical reason to remove the speaker from the case.

Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: 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.

My experience opening the set was not traumatic, I 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.

The “digitals”, by comparison, vary this 1st mixing frequency and thus 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. The 2nd mixer in the older set is less prone to overload as well. The critical part in terms of drift remains the 1st LO. There is a screw between the lower edge of the board and the battery compartment to be removed.


2SK_PDF Datasheet Download IC-ON-LINE

If you want to operate datasbeet set out of the case, substitute another speaker, or use extension leads to the one in the case. Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up. The first datxsheet in particular was not minor, indicating that several bugs had to be worked out. Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz.

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. This is done by adjusting RV2 a trim pot near the upper right corner of the main PCB’s datasheeet side so that a voltage of 1. If you want to go further, unplug the ribbon cable and fold the board back. 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.

Here’s a complete scanned service datasheeg for the ICF Head over to my receiver review corner in order to read it.

The shifted 75m coverage datasheey 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 between about to kHz.

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. 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 with ultimately better reception and readout accuracy if not the same stability, always a problem with wide-range analog tuned oscillators.


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 still buy at datadheet the current iteration of such a chip in case a replacement is needed. 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 datasjeet place one IF earlier.

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 datassheet 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.


While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or 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 2sl508 1st IF and a beefier 2nd mixer.

Partly but not solely due dxtasheet all the different versions, the service datashete are pretty thick, in stark contrast to the ‘s minimal service manual! I bought a used ICF in I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.


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 this set NEW from a Sony dealer inhave forgotten which year. Not that much of a battery hog.