[Hammarlund] HQ-180 Alignment issues

[Jeff]

Ron:

Here's what I used in the 3035 IF cans:

https://www.mouser.com/productdetail/810-fk26c0g2j331j

Multilayer Ceramic Capacitors MLCC - Leaded 330pF 630volts C0G 5%


My HQ-180 was in similar shape as you describe.  I replaced all of the 
mica sheets in the IF cans by drilling out the brass ferrule on the 
bottom while the can was gently affixed to a bench vise.  If you're 
careful, it's not a job to be afraid of -- just be gentle with 
everything.  I removed the mica sheets, clipped back the metal tabs and 
just reassembled the can.  I put the new capacitors across the leads on 
the bottom of the cans and rewired everything.  I was immediately able 
to get sharp peaks and it has worked flawlessly for two years now. 
Hardest part was getting the cans remounted back on the chassis.

Jeff
WB3JIH



On 1/1/2018 7:59 PM, AW Parker wrote:
> Hi Ron,
>     On the 3035kc cans, you may have all bad internal caps.  They are 
> molded into the can's base, you can see where they are by removing the 
> shield on some, not all.  I have some pix somewhere of how I cut into 
> those bases and was able to disconnect the molded in cap and put some 
> external caps (100pf IIRC) externally on the pins.  It's not much fun 
> to do, but if you're at max L, sounds like the C is way low.
>     I just looked for the pix, they're AWOL at the moment, I'll try 
> agn in the AM.
> 73,
>
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>
> "There is nothing -- absolutely nothing -- half so much
> worth doing as simply messing about in boats"
> Ratty, to Mole
>
> On 1/1/2018 7:30 PM, Ron.K3PID wrote:
> = (snip) NOW moving on to the 3035 KHz alignment, I injected an 
> unmodulated 3035.00 KHz signal at the grid of V2 ( pin 7 ) and tried 
> to peak L4 and T5 thru T1 as prescribed BUT I can not get a peak! in 
> all of the cans the maximum reading occurs with the adjustment all the 
> way bottomed out (max inductance). My first thought was that the 
> frequency is not centered but as far as I can tell all of the 
> frequencies are spot on.
> =
>> Any suggestions will be appreciated as usual...
>>
>> Ron K3PID
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html