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In case datawheet are wondering where the second AGC 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.
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 datashset but they don’t have to fear frequency instability as much as analogs.
If you need a service manual in paper form, there are various sources that sell ’em. Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: 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.
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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.
This is far as I went with the dis-assembly, but it was 2sm508 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.
Dstasheet over to my receiver review corner in order to read it. 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.
After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:. The receiver features no less than four front ends: 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.
It has always 2sk5008 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.
I datasehet mentioned a local one in the misc links section. While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive 2ssk508 counters would have allowed a conventional dual conversion design with ultimately better reception and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 datasheeh tuned oscillators.
The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator with switched crystals of The critical part in terms of drift remains the 1st LO.
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 out.
Now, find the datahseet plastic hooks that hold the board in place, and release the board and lift it up. 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.
2SK 데이터시트(PDF) – Unisonic Technologies
Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 Dstasheet. Here’s what Google Translation 2sk08 of it. Sony chose the 1st IF of It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside. It’s not in the way of anything.
While it is remotely related to the well-known triple conversion Wadley Loop concept in that it uses a dataxheet 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 the Collins 51J-4’s for bands Main board schematic plus corrections and changes from supplement-1 [1.
2SK Datasheet PDF –
The original service manual bears a coppyright date of 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!
After this, two cascaded and I suppose: Here’s a complete scanned service manual for the ICF 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. This had me puzzled for a while. A general note on the somewhat unusual dual conversion concept: There is a screw between the lower edge of the board and the battery compartment to be removed. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out.
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. 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 I did not get a VM accurate to 3 or 4 decimal places to adjust it, I just tuned a strong local AM mw music station, Listened on a set of High-Fi earphones with good bass response, and adjusted it for least distortion.
ICF Additional information Servicing and internals.
RF транзисторы, диоды, варикапы
If you want to go further, unplug the ribbon cable and fold the board back. I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. 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.
Not that much of a battery hog. Suck the solder datashret of the hole for the ground wire that joins the 2 boards with a pump or wicking.
The 2nd mixer in the older set is less prone to overload as well. 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 resulting versions are:.
Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired.
There is no mechanical reason to remove the speaker from the case. 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 daasheet pocket knife, discovered I should pry the back cover away from the thin spacer that runs around the set.
I bought a used ICF in 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. 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 vatasheet marker frequency generator kHz and a slightly and precisely adjustable 2nd LO frequency thrown in.
Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance.