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XPR7550 RF adapter

Posted: Wed Dec 06, 2017 1:43 pm
by motorola_otaku
So my XPR got run over by a car the other day :o and I figured I'd do a full alignment on it while it was on the bench getting a new everything except the main board. I found the RF service port on the back, and these part #s for the adapter:
PMLN6154A, RF ADAPTER and PMLN6155A, RF ADAPTER HOLDER

which cost a whopping $158 and $134 from MOL, respectively. No thanks.

Is there a more cost-efficient alternative? Or should I just go find a shop to "borrow" one from?

edit: for reference, here's a pic of the connector:
Image

Re: XPR7550 RF adapter

Posted: Wed Dec 06, 2017 5:56 pm
by N4KVE
Sadly, that's it. GARY.

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 3:18 am
by Bill_G
On the plus side, you're half way to a new one, and there are a few shopping days until Christmas left!

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 5:50 am
by jry
looked at the same issue and posted a question to see if there was a standard connector that would fit.

For a single radio I would just use a smaller 50 ohm coax with a center pin and tack the ground close by.

The connector has a built in switch to disconnect the antenna and matching components.

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 9:08 am
by motorola_otaku
I tried my limited selection of micro-connectors and nothing worked, so I figured it was something proprietary. Thanks for the responses.

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 4:43 pm
by firecomm
It does look a lot like a satellite radio antenna connector. I wonder if you had a spare one laying around and it's not required, try the connector to see if it fits and if so, cut it up and try using that?

Link to the antennas;

https://shop.siriusxm.com/parts/antennas/

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 4:58 pm
by N4KVE
I seem to remember the guys on P25.CA trying to figure this out, & could not. GARY

Re: XPR7550 RF adapter

Posted: Thu Dec 07, 2017 7:46 pm
by RFguy
This is the type of things that piss people off about Motorola. I find most of their stuff is reasonably priced, but something like this, a $15 part for $150.

Really?

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 8:57 am
by com501
Put another $100 with the cost of the adapter kit and flat rate it.

Our department has multiples of these kits. All the Gen II radios use some form of this adapter.

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 9:02 am
by N4KVE
RFguy wrote:This is the type of things that piss people off about Motorola. I find most of their stuff is reasonably priced, but something like this, a $15 part for $150.

Really?
This is an item that only a 2-way shop would buy. Not an end user who wants to attach an external antenna to a Gen 2 radio. Moto's thinking is the shop will generate thousands of dollars in alignments by using this adapter kit. So they price it accordingly. GARY

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 11:47 am
by Astro Spectra
I think it's possible that the coax insert used in DIN41612 connectors might just fit. On the left here:

Image

The ID of the inner bifurcated section is 4.2mm. But could be gently squeezed tighter or open +/- 0.5mm with tweezers.

If this fits I'll mail you one with some coax attached.

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 1:09 pm
by 35echo
motorola_otaku

I posted this on another site.

The connector on those boards appear to be Hirose MS-147. The mating connector for test would be Hirose MS-147-HRMJ-1.
This is a MS-147 to SMA adapter.

Regards

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 1:28 pm
by Astro Spectra
3.4mm OD on the socket.

Re: XPR7550 RF adapter

Posted: Fri Dec 08, 2017 10:50 pm
by 35echo
3.5mm ID on the actual Motorola test adapter.

Regards

Re: XPR7550 RF adapter

Posted: Sun Dec 10, 2017 6:16 am
by jry
ordered a inexpensive MS-147 to SMA cable.
Requires disassembly.

There is a roughly $25 straight adapter on the major parts sites. Not sure it's long enough to avoid disassembly on the 7000 but may work on the 3000 series.

They do have longer/ deeper ones but then you get back to the $122 price tag.

Re: XPR7550 RF adapter

Posted: Mon Dec 11, 2017 7:45 am
by escomm
FWIW they make a call box kit with the XPR7550/XPR7550e chassis with an SMA jack as we're all used to... if one is enterprising you can order the jacks and replace them on the PCB, problem solved :lol:

Re: XPR7550 RF adapter

Posted: Mon Dec 11, 2017 4:11 pm
by motorola_otaku
35echo wrote:The connector on those boards appear to be Hirose MS-147. The mating connector for test would be Hirose MS-147-HRMJ-1.
This is a MS-147 to SMA adapter.

I think you're right. This is a stock image:
Image

I found the SMA adapter on Mouser so when it gets here hopefully in a couple of days I can confirm. Thanks!!