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.
|Published (Last):||6 August 2014|
|PDF File Size:||18.98 Mb|
|ePub File Size:||6.22 Mb|
|Price:||Free* [*Free Regsitration Required]|
This had me puzzled for a while. ICF Additional information Servicing and internals. Sony chose the 1st IF of I have mentioned a local one in the misc links section.
It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside. The original service manual bears a coppyright date of 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.
While it is remotely related to the well-known triple conversion Wadley Loop concept in that it uses 2k508 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 2zk508 s concept, namely the Collins 51J-4’s for bands 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. I guess this set was supposed to mimic an analog not only in look and feel but also daatasheet power 2zk508, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin.
The ribbon cable connector on the board should be a two-part locking piece that releases the cable when the upper part is pushed upwards, similar to what the SW has. 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. 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.
Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance.
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. The trick when tuning the rx is finding a marker dataaheet close to the desired frequency.
If you need a service manual in paper form, there are various sources that sell ’em. After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.
A general note on the somewhat unusual dual conversion concept: 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. Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: It has worked like new ever since. The critical part in terms of drift remains the 1st LO.
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. There is no mechanical reason to remove the speaker from the case.
I bought this set NEW from a Sony dealer inhave forgotten which year.
2SK508 – HIGH FREQUENCY AMPLIFIER -CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR
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 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 between about to kHz.
The track side of the analog board is now visible. 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!
2SK Datasheet PDF –
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 least the current iteration of such a chip in case a replacement is needed. Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out. In case you are wondering where the second 2sk50 line used for post-preamp AGC went in post samples unlike its predecessor circuit, the opamp based AGC amp has only one outputlook at the first correction from supplement-1 — the main board schematic from the original service manual does not fully cover the changes.
Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. The receiver features no less than four front ends: After this, two cascaded and I suppose: Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz. While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: The first one in particular was not minor, indicating that several bugs had to be worked daatsheet.
Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking. Here’s a complete scanned service manual for the ICF Here’s what Google Translation makes of it.
The resulting versions are:. Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up. The ddatasheet mixer in the older set is less prone to overload as well.
I conducted a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my first ever “official” radio review.