Harris CD Link

Gotta watch those Fresnel zones!
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kkiddkkidd
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Harris CD Link

Post by kkiddkkidd » Sat Mar 11, 2017 11:10 am

Hi all,

I have a client with a broken Harris CD Link system following a lightning strike Thursday night.. It is the only pair that I have at any client and they can't find the manuals. I have located a .pdf of the manual.

1. The TX shows 2w fwd and SWR of 1.04. No faults or warnings. I am assuming that this unit is fine.
2. The RX started out showing 76.6 uV w/ quality of 0.0%, BER of 0.0E-00. After removing the AES from the Orban processor it read 76.6uV but a quality varying between 50-60% but I don't recall the BER. It was alternating between a couple of Warning faults for Sig Quality and I believe BER. If I am reading the .pdf manual correctly, that should be an abundance of RF signal. The path is abt 6 miles & clear.
3. We removed both the RX and TX to be evaluated by Harris but quickly learned that they are now charging $2400 EACH flat rate repair. The owner immediately said that he would buy a new composite pair before spending $5k on repairing these.
4. We were going to check the RX at the studio before shipping. However, upon plugging it in at the studio, the display blinked once and never showed any life again. So am assuming that the PS (at least) has gone toes up.
5. We were not able to carry the TX to the RX location to check the RX antenna but will do so next week. If the RX signal strength that we are seeing is as strong as I believe, I doubt that there is a problem w/ the rx antenna.
6. All of my loaner/rental STL units are in use elsewhere so can't test that way.
7. They are on the air via a verizon aircard and their online stream. It actually sounds pretty good as long as the connection doesn't drop.

Questions:

Is there an aftermarket open frame PS compatible with the RX? I have seen posts on other reflectors about power supply problems and that they are an off the shelf PS but can't find any reference to a specific part number. The manual only notes Harris's # and a description of PS001. There are no generic numbers visible on the PS.

Anyone ever saw a PS problem that affected the RX decode quality? There was no other indication that the PS was bad until the RX failed to come back on following a 6 mile ride to the studio.

Does anybody know of a repair facility that doesn't charge an arm and both legs. I have sent an email to Mike Patton and am awaiting reply.

Regards,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

kcbooboo
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Re: Harris CD Link

Post by kcbooboo » Sat Mar 11, 2017 2:29 pm

I think you're on your own. Harris did the same with their Aurora series of 5.8 MHz link equipment, wanting more than the units cost just to check them out.

You should be able to buy another power supply if you can figure out what the original is supposed to be putting out. The size seems to be an industry standard. I think I had to research one for the Aurora.

Buy some Ubiquity equipment to replace it. They have at least one model that has an N connector on it, and that worked fine to replace the Aurora units that have external dishes up on a tower. In the case of the receive antenna, that's up 400ft on a tower that's 100ft from the building, and is fed with 1/2 inch Heliax. The Ubiquity unit - about 4 inches long and 1.5 inches in diameter - worked perfectly and the coax is holding it in the same spot that the Aurora was sitting.

Bob M.

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kkiddkkidd
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Re: Harris CD Link

Post by kkiddkkidd » Sat Mar 11, 2017 4:15 pm

Thanks,

We just aren't feeling real warm and fuzzy about putting $5k into a 15yo set of equipment that can be replaced for $3600 with a Nicom or Armstrong.

After a bunch of digging. It appears that the PS is a Power One MAP40-3003... Ironically the same as BE uses on the AMx series of TX for control power. Also the same as the old StarGuide sat RXs.

I have one in stock and will be giving it a try Monday. If anyone has had problems with bad PS causing poor digital quality, I would be interested.

Regards,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

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kkiddkkidd
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Re: Harris CD Link

Post by kkiddkkidd » Sat Mar 11, 2017 5:00 pm

I talked with the owner yesterday about putting up a UBNT link to the site. It should be good with a pair of 5.8 Rockets and 30 or 34 dBi dishes. The path is clear from reasonable elevations on both ends.

Regards,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

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kkiddkkidd
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Re: Harris CD Link

Post by kkiddkkidd » Mon Mar 13, 2017 6:41 pm

Today I replaced the Power One MAP40-3003 ps with a brand new one... The RX powered up this time but still showing Sync Fault. The owner ordered a Nicom pair to get off of the Verizon AirCard link and we will be hunting a working CD Link RX.

Later,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

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Slab Bulkhead
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Re: Harris CD Link

Post by Slab Bulkhead » Tue Mar 14, 2017 9:31 pm

kkiddkkidd wrote:
Sat Mar 11, 2017 11:10 am
3. We removed both the RX and TX to be evaluated by Harris but quickly learned that they are now charging $2400 EACH flat rate repair. The owner immediately said that he would buy a new composite pair before spending $5k on repairing these.
Wow. Just, wow... :shock:

And they wonder why no one wants to buy their stuff anymore.

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Deep Thought
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Re: Harris CD Link

Post by Deep Thought » Tue Mar 14, 2017 10:22 pm

Slab Bulkhead wrote:
Tue Mar 14, 2017 9:31 pm
And they wonder why no one wants to buy their stuff anymore.
That ship sailed awhile ago. About 10 years back a client took a lightning strike and called Harris for parts to repair their Gates 1. They were only 60 miles from Quincy and wanted to drive over to pick them up.

Harris tech support said there were no parts and they couldn't help, but would he happy to transfer them to sales for a new transmitter.

Client hung up, called BE and had a new transmitter installed three hours later. BE had it tuned and waiting for them when they arrived.
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

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Shane
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Re: Harris CD Link

Post by Shane » Wed Mar 15, 2017 10:38 pm

And I'll bet he has had ZERO trouble with it.
Mike Shane, CBRE
---Omaha---

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kkiddkkidd
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Re: Harris CD Link

Post by kkiddkkidd » Thu Mar 16, 2017 8:49 am

Shane wrote:
Wed Mar 15, 2017 10:38 pm
And I'll bet he has had ZERO trouble with it.
If it is 10 years old, the control PS is probably ready to give up (if it hasn't already). Make sure that you have a MAP40-3003 handy (the same as in the CD Link RX & StarGuide RX's.

That is about the only chronic problem that I have found with the AM1's... There has been reports of melted fuse holders on the RF modules but I have never encountered it in close to a dozen AM1 to 6's that I maintain or at least see regularly.

Regards,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

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GregHahn
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Re: Harris CD Link

Post by GregHahn » Mon Apr 17, 2017 7:36 am

kkiddkkidd wrote:
Sat Mar 11, 2017 4:15 pm
Thanks,

We just aren't feeling real warm and fuzzy about putting $5k into a 15yo set of equipment that can be replaced for $3600 with a Nicom or Armstrong.

After a bunch of digging. It appears that the PS is a Power One MAP40-3003... Ironically the same as BE uses on the AMx series of TX for control power. Also the same as the old StarGuide sat RXs.

I have one in stock and will be giving it a try Monday. If anyone has had problems with bad PS causing poor digital quality, I would be interested.

Regards,
Do both the CD Link transmitter and receiver take the same power supply? I have two of each on the air.
Greg Hahn
Chief Engineer
WQNU WRKA WVEZ WSFR
Louisville KY USA

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GregHahn
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Re: Harris CD Link

Post by GregHahn » Mon Apr 17, 2017 2:02 pm

My answer appears to be "yes". Both units take Harris part # 736-0292-000. :)
Greg Hahn
Chief Engineer
WQNU WRKA WVEZ WSFR
Louisville KY USA

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kkiddkkidd
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Re: Harris CD Link

Post by kkiddkkidd » Wed Apr 19, 2017 5:41 pm

GregHahn wrote:
Mon Apr 17, 2017 2:02 pm
My answer appears to be "yes". Both units take Harris part # 736-0292-000. :)
I believe that the TX uses a second high current supply for the PA that is also a generic open frame supply.
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

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GregHahn
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Re: Harris CD Link

Post by GregHahn » Mon Apr 24, 2017 11:28 am

kkiddkkidd wrote:
Wed Apr 19, 2017 5:41 pm
GregHahn wrote:
Mon Apr 17, 2017 2:02 pm
My answer appears to be "yes". Both units take Harris part # 736-0292-000. :)
I believe that the TX uses a second high current supply for the PA that is also a generic open frame supply.
Yup. I went ahead and popped open a transmitter to be sure. The other one in the transmitter is a Power One MAP55-1024.

https://www.digikey.com/product-detail/ ... As9t8P8HAQ

http://www.mouser.com/ProductDetail/Bel ... EVcg%3D%3D
Greg Hahn
Chief Engineer
WQNU WRKA WVEZ WSFR
Louisville KY USA

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