Registrations in the queue through May 14 at 7:00a ET have now been activated. Enjoy! -M.W.

Terms of Use have been amended effective October 6, 2019. Make sure you are aware of the new rules! Please visit this thread for details: https://www.mibuzzboard.com/phpBB3/view ... 16&t=48619

Trials of restoring Heathkit DX-35

The technical side of broadcasting. Think IBOC is a sham? Talk about it here! How about HDTV? Post DX reports here as well.
CK-722
Posts: 965
Joined: Sun Dec 16, 2018 3:53 pm

Re: Trials of restoring Heathkit DX-35

Post by CK-722 » Sun Dec 01, 2019 8:41 pm

What's the difference between the 5T and the 5H? WFDF had a 5H, and it seems like it was wider, like three panels?


Is THAT where they got the idea for the 486-SX?

Same (x, y, z), different (t)

Your bullet missed my trial balloon.

RTN Price. Not guaranteed. As of 12:30, 157.71 Down 0.22.

Artificial Intelligence is a Child that needs a Parent to guide it through.

User avatar
audiophile
Posts: 4038
Joined: Sat Dec 04, 2004 9:21 pm
Location: Between 88 and 108 MHz.

Re: Trials of restoring Heathkit DX-35

Post by audiophile » Mon Dec 02, 2019 8:33 am

Ed Joseph wrote:
Sun Dec 01, 2019 7:29 pm
ImageThis, exactly... Only left channel was wired up.
I installed that unit for WQON to protect STL's when it was next to bakery. It doesn't have a clipper either.


Ask not what your country can do FOR you; ask what they are about to do TO YOU!!

FET-500
Posts: 464
Joined: Sat Nov 10, 2018 9:22 am

Re: Trials of restoring Heathkit DX-35

Post by FET-500 » Mon Dec 02, 2019 9:58 am

audiophile wrote:
Mon Dec 02, 2019 8:33 am
Ed Joseph wrote:
Sun Dec 01, 2019 7:29 pm
ImageThis, exactly... Only left channel was wired up.
I installed that unit for WQON to protect STL's when it was next to bakery. It doesn't have a clipper either.
Please elaborate: was the signal digitized and sent out on microwave?



User avatar
audiophile
Posts: 4038
Joined: Sat Dec 04, 2004 9:21 pm
Location: Between 88 and 108 MHz.

Re: Trials of restoring Heathkit DX-35

Post by audiophile » Mon Dec 02, 2019 11:12 am

Analog Microwave. A pair of Marti STL8's.


Ask not what your country can do FOR you; ask what they are about to do TO YOU!!

FET-500
Posts: 464
Joined: Sat Nov 10, 2018 9:22 am

Re: Trials of restoring Heathkit DX-35

Post by FET-500 » Mon Dec 02, 2019 11:32 am

audiophile wrote:
Mon Dec 02, 2019 11:12 am
Analog Microwave. A pair of Marti STL8's.
My friend at work (our webmaster) used to do point to point on the Mexican border. The equipment is getting so cheap, we're joking about our own network.

My brain is starting to spasm over the idea of a "man-in-the-middle" attack on this type of link.



User avatar
Ed Joseph
Posts: 378
Joined: Sat Sep 10, 2005 9:27 pm

Re: Trials of restoring Heathkit DX-35

Post by Ed Joseph » Tue Dec 03, 2019 4:50 pm

At some point, this Orban was evidently moved to the AM... as I think back, the phase was probably reversed to the TX.

Honestly, I think I'd rather have analog STL over digital. That's just me. I do not trust digital, or especially the internet infrastructure, to be hardened enough if the Sun decides to flare us in a major way or an EMP occurs due to any event. I just feel if that happens, analog stuff has a better chance of surviving. It should always be a backup option at any rate.


I confirm all my information through a high, white whore's souse!

CK-722
Posts: 965
Joined: Sun Dec 16, 2018 3:53 pm

Re: Trials of restoring Heathkit DX-35

Post by CK-722 » Tue Dec 03, 2019 9:56 pm

WKNX used an RCA BTA 10H, which is outwardly nearly identical to an RCA BTA 5H.

Barry Mishkind pictures of 5 kW transmitters back in the 1950s and 1960s.

https://www.oldradio.com/archives/hardware/RCA/5.htm


Is THAT where they got the idea for the 486-SX?

Same (x, y, z), different (t)

Your bullet missed my trial balloon.

RTN Price. Not guaranteed. As of 12:30, 157.71 Down 0.22.

Artificial Intelligence is a Child that needs a Parent to guide it through.

User avatar
Ed Joseph
Posts: 378
Joined: Sat Sep 10, 2005 9:27 pm

Re: Trials of restoring Heathkit DX-35

Post by Ed Joseph » Wed Dec 04, 2019 3:32 pm

I remember actually seeing that RCA at WKNX working back in the Day. It was trashed to make room for the MW10 in around 1979-80.

Edit: Honestly, I thought the RCA sounded better than the Harris.


I confirm all my information through a high, white whore's souse!

k8jd
Posts: 251
Joined: Fri Jun 28, 2013 3:35 pm
Location: Commerce, MI

Re: Trials of restoring Heathkit DX-35

Post by k8jd » Thu Dec 12, 2019 4:20 pm

The rectifier tube may have been a good sub. many of the 5V filament dual diode tubes were using the same pin linup for the elements, only made physically different to handle more or less Plaate current and voltage. .



User avatar
audiophile
Posts: 4038
Joined: Sat Dec 04, 2004 9:21 pm
Location: Between 88 and 108 MHz.

Re: Trials of restoring Heathkit DX-35

Post by audiophile » Thu Dec 12, 2019 8:55 pm

Ed Joseph wrote:
Wed Dec 04, 2019 3:32 pm
I remember actually seeing that RCA at WKNX working back in the Day. It was trashed to make room for the MW10 in around 1979-80.

Edit: Honestly, I thought the RCA sounded better than the Harris.
Why did they trash it, if it was working?


Ask not what your country can do FOR you; ask what they are about to do TO YOU!!

User avatar
Ed Joseph
Posts: 378
Joined: Sat Sep 10, 2005 9:27 pm

Re: Trials of restoring Heathkit DX-35

Post by Ed Joseph » Sat Jan 25, 2020 11:43 am

If I recall, it was having some problems with the plate transformer, it was up on woodblocks to isolate it from the cabinet because it has shorted internally. It would do low power but not high. I hope I have that right, it was like 1979.

Edit to add: I would guess, if the engineer wasn't Jim McCluskey, it probably could have been "properly" repaired and kept for backup. Then again, it was pretty big and they had to shoehorn an MW10 in that small space on Gabel rd.


I confirm all my information through a high, white whore's souse!

User avatar
Ed Joseph
Posts: 378
Joined: Sat Sep 10, 2005 9:27 pm

Re: Trials of restoring Heathkit DX-35

Post by Ed Joseph » Sat Jan 25, 2020 12:04 pm

UPDATE on DX-35

At this point, there is something in this unit which just isn't right. Something changes after it's making moderate power (45watts in CW) into dummy load a few minutes, front panel meter pins and the fuse opens.

I am tempted at this point to strip this thing down and make a simple all-band amp out of it.


I confirm all my information through a high, white whore's souse!

User avatar
audiophile
Posts: 4038
Joined: Sat Dec 04, 2004 9:21 pm
Location: Between 88 and 108 MHz.

Re: Trials of restoring Heathkit DX-35

Post by audiophile » Sun Jan 26, 2020 8:48 am

Bad tube ruled out?


Ask not what your country can do FOR you; ask what they are about to do TO YOU!!

Post Reply Previous topicNext topic