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I just finished pretty much a complete overhaul of a nice condition (physically) SX-28A. Replaced just about every resistor and all caps. Radio is working well except for a 120hz hum. When I switch

Emanuele, RE: Assuming each of these should be two different coils, it seems one of those two coils is split in two. Yes, now it is clear and both L3 and L6 are similar looking too RE: Can C62 happen

Hi, Emanuele, That's an interesting thought about a gimmick capacitor. But the parts list for the S40B specifies C62 as 2.2mmf, 500 V, bakelite, with a Hallicrafters part number (47A160-4). 73,

Don, the first left picture is L3, the second right is L6. Can C62 happen to be a sort of gimmick between the S1 rear and front rotors? After all it's 2pF only.. Enjoy this other picture of the MIX

Guys, agreed for L3 , but the connections to L6 don’t have a source wire shown and don’t have the same switch profile for grounding so the L6 area is a big part of the mystery. The switch profiles

Emanuele, good to see you out of hibernation! Are you portraying L3 ?? so one coil is in the middle and the other is split with half on each side???. So lots of mutual inductance between the upper and

Hi, Emanuele, This would not be an unusual way to wind a transformer of the types like L3 and L6, especially if there is a turns ratio much higher than unity. That might be the case in these

Hi, Emanuele, Are you still having trouble with Bands 1 and/or 2? If so, I wonder whether C62 might have been removed to make your S-85 conform with the schematic? 73, Maynard W6PAP

Hi, Don, I agree that there is no signal path to the right for Band 1 in the S-85 schematic and no C62 in the parts list. And the SX-99 has the same issue from it's BAMA schematic. There has to be

I can confirm C62 is not installed in my S-85. -- Emanuele (IU1KNR). https://egirland.blogspot.com

Richard, you apparently have skipped over a number of posts, I previously posted an image with S1A front rotated to each band separately. It showed that the signaw goes in one of the coils and udes

I meant something like that: (forget the values!) -- Emanuele (IU1KNR). https://egirland.blogspot.com

What an interesting thread! My one cent contribution: see how the L3 and L6 are actually built in my S-85. Assuming each of these should be two different coils, it seems one of those two coils is

Maynard, maybe I said /showed that stuff poorly. Hopefully C27c is solid as a rock, but C29 will develop a good signal voltage up to 1.6 Mcs. My red lines were only intended to show the path to the

Hi, Don, The B+ line at the bottom of R26 and C29 is heavily filtered. It ought to be B+ DC voltage only with all AF and RF signals that might be present filtered to ground. And C27C, 10 uF, will do

Hi, Don, I didn't include that path in my conjectures because it's connected directly to B+ and a large capacitor to ground in the power supply. Any variable voltage, such as an RF signal, ought to be

My problem too with the S-85 drawing on BAMA and looking at band 1 there is nothing complex to look at. Sent: Wednesday, February 12, 2025 9:47 PM To: [email protected] Subject: Re:

Somebody will want to know the model no of the Skybuddy there is more than 1? _____ Groups.io Links: You receive all messages sent to this group. View/Reply Online (#31663)

Here is what I see for the S-85 mixer tanks for Band 1 only … a simple situation.. but how can any signal get away from the RF amp plate circuit ans to the next grid??? Sorry I overdrew the bare

Hi, Don, I'm missing something because I'm just not seeing a signal path from V1 to V2 for Bands 1 and 2. I'll look a bit more. 73, Maynard W6PAP