Mitsubishi Power Amplifier modules

[SkyVision]

I like the G4BAO design, John's driver works well, but in search of a Mitsubishi Module replacement a VK3 recomended one of these
eBay item number:134974609222 which has TQP3M9008 driver coupled to MHV5IC2215, the module runs on 24V
The power device is for 1990mhz, is wideband and rated to 1200Mhz the housing is marked 1250Mhz
The measured gain on the bench tonight, at 1287Mhz, with 0dbm input gain was 42db, I checked several times, as I thought it was OTT

The VK3 guy would be using it on wideband DVB-S, the devices are for wideband digital applications, sounds to good to be true
The power device can do a 15W CW but the CDMA spec is 23dbm so: driver or power device, not real sure yet
Has any one used these to any effect, what stable power levels can be expected?
Maybe it's just junk like the last Chinese Mitsubishi Module knock off I tried

Cheers Roger VK5YYY

https://www.qorvo.com/products/d/da005504
https://www.nxp.com/docs/en/data-sheet/MHV5IC2215N.pdf

DSCN1070.JPG (727 KiB) Viewed 6170 times

[radiogareth]

Roger, UK eBay does not find that link number, could you post the text title or a direct link please? Just what I need to drive my 23cm PA.
Thanks
Gareth

[G8IKP]

Thats eBay.com Gareth.
I always buy on .com pay in USD with a transaction comission free card with wholesale exchange rate.
Don't use paypal and pay in GBP, then you get things a lot cheaper

John G8IKP

[radiogareth]

Thanks John, found it and then tracked similar on UK eBay, item number 266486980774.
Think I'll hold fire on this until others report its true performance especially under DATV usage. I had one of the 6cm units that worked well but was 'electronically fragile'....ie it expired with no clear cause....
Gareth

[SkyVision]

Hi Gareth

I just tested it on the bench with DVB-S2, DVB-T might strain the relationship that's tomorrow nite
Excellent is the summary, quite efficient no notable MER degradation, I went to around 4W, what's the hitch, the VK3 guy was right?
xihu888 is my trusted Chinese seller
I'll give a full report later when home

Cheers Roger VK5YYY

Screenshot (41).png (339.87 KiB) Viewed 5949 times

[radiogareth]

Thanks Roger, Found the store on UK ebay and made an offer ($50) which was accepted. Cost to me in the UK via paypal conversion £52.08.
Useful to know its a trusted seller too although I generally don't have too many issues.
Might put a circulator on its output just to keep it safe(er).
Means I can get to drive my uprated output device closer to its max. - still the BAO design just a different (drop in) device.
Its a MRFE6S9060NR1 should you ever need to replace or upgrade.
73
Gareth

[SkyVision]

I ran the Dexing DVB-S2 modulator 8PSK 5Msym around -10dbm input to the amp
It produced 3-4 Watts into the load in my uncalibrated test setup
That puts gain at more around 45db ish which is hard to believe
Output MER is great and at 24V only 0.5A so around 30% efficient, the unaspirated heat sink wasn't very warm at all

I'll have a crack at DVB-T tomorrow, that will sort the men out from the boys
Can any of you VK3's weigh in with your experiences
I don't think I was close to the 1db compression point?
More testing required with proper power measurements, should be fine for RB DVB-S

Cheers Roger VK5YYY

23cm amp.jpg (757.37 KiB) Viewed 5897 times

Around 70db coupling.jpg (828.03 KiB) Viewed 5897 times

[g6hfs]

Hi,

Looking for a pcb for the older brick amp M57762 5 pin version, any out there.

Brian

[SkyVision]

Hi Brian

PCBs are overated, use a 15mm strip of FR4 PCB as shown in the pics and bulkhead hardline to the in and out, coax will work
Earthing is key to milking most gain out of the module and stability, LOTS OF EARTHING, sorry about shouting ; )
Lugs from the module hold down screws soldered to the PCB, screw near bias and Vcc and back up copper wire direct from ground
The module sandwiches the Hamond box to the Pentium heatsink/fan with full time power, with an ooze of heatsink paste

Flaten the words Hammond in the diecast to obtain a flat surface to mount the module and a quick fine sand on the bottom of the box
5V from regulator into 500ohm trimer and T filter for bias/power, 6 hole and small ferrite from Sat splitter with 10, 100, 1000pf (or whatever)
Here's one I built this week, it's a newer module but you get the idea, you'll need one extra Vcc, only took a couple of hours to knock up
I sand the modules flat on the belt sander, but this is an area of great controversy, to sand or not to sand?

Cheers Roger VK5YYY

Input.jpg (521.81 KiB) Viewed 5575 times

Layout.jpg (550.87 KiB) Viewed 5575 times

Close up.jpg (560.05 KiB) Viewed 5575 times

[G4FRE]

After reading the downeast microwave writeup https://01895fa.netsolhost.com/PDF/MOSFET%20PA_pdf.PDF i always sand my newer modules

Dave
G4FRE