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The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator datasheeh switched crystals of I have mentioned a local one in the misc links section.


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. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or After this, two cascaded and I suppose: The receiver features no less than four front ends: If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case.

I bought a used ICF in 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 the Collins 51J-4’s for bands Now to the most interesting part, satasheet shortwave bands, where the receiver works with dual conversion: I guess this set was supposed to mimic an analog not only in look and feel but also in power consumption, datassheet geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin.

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. Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz. 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 Sony series page: ICF, ICFDA/

Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance. Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out.

There is no mechanical reason to remove the speaker from the case. 2dk508


I bought this set NEW from a Sony dealer inhave forgotten which year. 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.

In case you are wondering where the second AGC datassheet 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 2wk508 the changes. A general note on the somewhat unusual dual conversion concept: 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.

It has worked like new ever since.

RF транзисторы, диоды, варикапы

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. Head over to my receiver review corner in order to read it. The interesting part is that if you can’t find a datasheet datasgeet one version, one that covers another version generelly will also do plus you can still buy at least the current iteration of such 2xk508 chip in case a replacement is needed. 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.


I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. That seems like the most sensible way of performing the adjustment, given datqsheet we want the best possible real-life AGC performance.

I dataaheet a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my first ever “official” radio review. If you want to go further, unplug the ribbon cable and fold datasheey board back.

Now, find the molded-in plastic hooks that hold the board in datassheet, and release the board and lift it up. The 2nd mixer in the older set is less prone to overload as well.

The track side of the analog board is now visible. 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. 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 is far as I went with the dis-assembly, but it was obvious that all you have to do to strip the set completely, dtaasheet unsolder the wires to the speaker and datashret it behind, glued to the front panel. Created yyyy-mm-dd Last revision It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.

Partly but not solely due to all the different versions, the service docs are pretty thick, in stark contrast datsheet the 2k508 minimal service manual! After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:. 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. ICF Additional information Servicing and internals.

There is a screw between the lower edge of the board and the battery compartment to be removed. The trick when tuning the rx is finding a marker het close to the desired frequency. Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking. While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: 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.

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. Sony chose the 1st IF of 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. If you need a service manual in paper form, there are various sources that sell ’em.

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. 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.