Motorola MHW2723

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G8XZD-TV
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Joined: Fri Feb 22, 2013 6:41 pm

Motorola MHW2723

Post by G8XZD-TV » Fri Feb 22, 2013 8:38 pm

Has anyone built up an amp for DATV using the Motorola MHW2723 that could pass on either a board layout or some constructional tips.

Many thanks Ian.

G4EWJ
Posts: 711
Joined: Wed Feb 17, 2010 10:11 am

Re: Motorola MHW2723

Post by G4EWJ » Fri Feb 22, 2013 9:17 pm

There's a document here in French:

http://f1chf.free.fr/DIGILITE/Ampli%205 ... 0F1DJO.PDF

If I've understood the French correctly, pcbs are available from CIMKO for €3 + €2 postage. Google says the description means 'epoxy with printed chokes'.

http://fr.groups.yahoo.com/group/ListeATV/message/7849

Email: cimko at free.fr

Perhaps if several people were interested, it would be worth ordering a few to save on postage from France.

Brian

G8XZD-TV
Posts: 94
Joined: Fri Feb 22, 2013 6:41 pm

Re: Motorola MHW2723

Post by G8XZD-TV » Fri Feb 22, 2013 9:46 pm

Thanks for the info - would certainly be interested in a couple myself having purchased a few of the devices on eBay. Hopefully it will get some useful power out of the XZD station.

Cheers Ian.

G4EWJ
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Joined: Wed Feb 17, 2010 10:11 am

Re: Motorola MHW2723

Post by G4EWJ » Sun Feb 24, 2013 12:01 am

I've emailed Cimko and asked how much it would cost to send a number of them over here.

Brian

G8XZD-TV
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Joined: Fri Feb 22, 2013 6:41 pm

Re: Motorola MHW2723

Post by G8XZD-TV » Mon Feb 25, 2013 10:57 pm

Just out of interest the French page shows two pcb layouts - a simple-looking one and then another much more complicated. Presumably the complicated one has the inductors etched on the pcb - or am I wrong?

G4EWJ
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Joined: Wed Feb 17, 2010 10:11 am

Re: Motorola MHW2723

Post by G4EWJ » Tue Feb 26, 2013 10:24 am

That's the impression I got. The prototype pcb had wired inductors and the final one has them printed.

No reply from Cimko yet.

Brian

g4bbh
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Joined: Thu Mar 13, 2008 7:19 pm

Re: Motorola MHW2723

Post by g4bbh » Wed Feb 27, 2013 12:24 am

I am interested in one of these boards too as I did purchase one of the MHW2723 modules and had not tried it yet. €3 + €2 = €5 in my book and Iound €5 note in my 'junk box' recently. Wonder if a Greek €5 note is still worth €5 these days :-)
It will be interesting to see how much power it will run with sufficient linearity for DATV.
Dick G4BBH

G4EWJ
Posts: 711
Joined: Wed Feb 17, 2010 10:11 am

Re: Motorola MHW2723

Post by G4EWJ » Wed Feb 27, 2013 12:40 pm

It's rated at 3W for Tetra which is DQPSK, so probably the same for us.

Postage to UK will probably be more, but it may not save much by getting a number of them and having to post them on from here.

Still no word from Cimko. I didn't think my French was that bad. :?

Brian

g8gtz
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Re: Motorola MHW2723

Post by g8gtz » Wed Feb 27, 2013 9:46 pm

I bought a couple and had a go at a DIY board - I managed to build the best wideband oscillator I've ever seen on my analyser!!

Talking to some folks in the know their comments were:

Important elements of the 'Test Fixture' are the use of capacitors having very low inductances. This is true for the 3.3uF - the ebay photo suggests it's a tant! Also L1 thru L4 are SMD inductors ( suggestion Farnell 2056515 - a Vishay-Dale product) and finally, build into the 'test fixture' 3 screens that separate the four inductors, and asociated components, from each other.

So yes, it is touchy and if there are some proven PCBs, I would definitely be interested in 2 units - maybe the BATC shop could do a bulk buy...

73s

Noel - G8GTZ

G8XZD-TV
Posts: 94
Joined: Fri Feb 22, 2013 6:41 pm

Re: Motorola MHW2723

Post by G8XZD-TV » Wed Feb 27, 2013 9:54 pm

I can confirm i'd be definitely be interested in two - esp if the batc shop was ordering some

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