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Almost ready to give up but...

 

Come on guys.? Enough
.
I bought the FET from a Canadian EBAY seller & when I told him, he immediately refunded all money including shipping.? It was during Easter & he was on vacation but still responded.? He has a 100% rating there.

I know there is too much bogus stuff out there, but this isn't one.
I buy a few things on EBAY & have only gotten burned once.? Maybe I am lucky.
--
-Bob
 

Latest update:
Q105 just doesn't seem to want to mix.? It tests well, but it is producing 42MHz instead of the 2-3MHz. ?? The 2 IFs coming in to it are fine.
So I am going to order MPF103's (can't find any 2sk19gr's).?
Meanwhile I'll check all surrounding components to make sure they don't have an issue.

The saga continues....
--
-Bob
 

Just wanted to publicly thank a member here for privately offering FRG7 parts.
Good people here.

I've put the FRG7 aside while I torture a Heathkit now.?
If I find a fix in the future, I'll update.

73 for now.
--
-Bob
 

I am beginning to think this radio is actually fine, it has been misaligned.? The VFO, "mHz tuning" should span from 55.5 to 84.5 mHz.? The first IF should be centered on 55 mHz, this can be checked by feeding in a small signal into the IF chain and monitoring the output at the second mixer. The Wadley loop section should be centered at 52.5 mHz, this is checked at the source of the second mixer.? The difference frequency between 55 mHz and 52.5 mHz is 2.5 mHz, the center frequency of the second tuneable IF.? When peaking/adjusting these IFs, use a very low amplitude signal as not to overload any part of the circuitry. Its just a process of elimination and perseverance........
 

Buy an nanoVNA from a reputable dealer like R&L and follow the manual procedure. Twice. The circuits interact so the 2nd pass is to compensate for that. You're unlikely to see significant change on the 2nd pass, but it's a good feeling to see all the test points as they should be.


On Tuesday, May 30, 2023 at 09:18:31 PM CDT, Pentagrid <dayleedwards@...> wrote:


I am beginning to think this radio is actually fine, it has been misaligned.? The VFO, "mHz tuning" should span from 55.5 to 84.5 mHz.? The first IF should be centered on 55 mHz, this can be checked by feeding in a small signal into the IF chain and monitoring the output at the second mixer. The Wadley loop section should be centered at 52.5 mHz, this is checked at the source of the second mixer.? The difference frequency between 55 mHz and 52.5 mHz is 2.5 mHz, the center frequency of the second tuneable IF.? When peaking/adjusting these IFs, use a very low amplitude signal as not to overload any part of the circuitry. Its just a process of elimination and perseverance........

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