Choosing small portable AMP.  | 
10-17-2009, 11:23 AM
| | Junior Member | | Join Date: Jul 2009 Location: Woodside NY
Posts: 8
| | Choosing small portable AMP. Hello,
I am searching for small amp to use in my car, home or in portable ham kit.
I wll use it with my VX-8R HT.
So far the best candidate I found is BD-35 dual band duplex amp. https://www.hamcity.com/store/pc/vie...4&idproduct=36
I like it because works with two bands I am interested in, but wider coverage would be even more preferable. It also has auto band selection, so I don't need to manually switch anything. Not that that would be a deal breaker if i had to :-)
Does anyone have anything better than this to suggest.
Also, does anyone know dimensions of this unit, or maybe can measure it and post, if you own one. I can't find it anywhere including official pdf file.
thanks in advance
Last edited by Milos; 10-17-2009 at 03:30 PM.
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10-17-2009, 03:41 PM
| | Junior Member | | Join Date: Jul 2009 Location: Woodside NY
Posts: 8
| | Heree is second candidate: http://www.rmitaly.com/scheda.asp?ID...at=19&tipo=116
Size vs. Power is great, but i'm not happy that it cannot do 440-450Mhz. Only 430-440Mhz.
any thoughts on these ?.. | 
10-19-2009, 12:59 PM
| | Senior Member | | Join Date: Apr 2002
Posts: 4,156
| | I would probably go with the Mirage over the RM Italy amp. RM Italy stuff doesn't have the best reputation for quality. At least if the Mirage has issues, you can send it to them to get repaired.
If you're interested in only a single band (2 meters) amp, the one sold by RF Parts is made by Tokyo Hy-Power and is pretty good, especially considering the price. I have a similar one that has a pre-amp built in and it works good for me: RF Parts Company | 
10-19-2009, 07:17 PM
| | Junior Member | | Join Date: Jul 2009 Location: Woodside NY
Posts: 8
| | ahh, I saw this little amp in your other post. Its so small, and convenient. Its great for what it does! Price is so low too!
I am definitely sure I need 440-450 range now as well as 2m. It is repeaters in my area i am looking to connect to, of coarse, and they are predominately 70cm band.
That is interesting to know that RM Italy hasn't proven themselves. I actually thought it would be the other way around. I like they provide complete circuit diagrams and parts list before you even buy :-) But their units, as i learned have 10Mhz band pass filters which would need to be tuned up specially for me to cover 440-450Mhz range. It gets complicated, since the only dealer in US doesn't do this type of mod at their site.
I also found records of BD-38 unit. http://www.rigpix.com/linears/mirage_bd38g_manual.pdf
pic. here RigPix Database - Power amplifiers - Mirage BD-38-G
I don't really know where to buy one (or if i even should - since its not offered on Mirage web site even), but it has a lot more power I wouldn't mind having at my disposal.
In a way, I'm surprised i don't see more choices out there.
thanks for the advice moleculo, as always!
Last edited by Milos; 10-19-2009 at 07:39 PM.
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10-25-2009, 10:42 PM
| | Junior Member | | Join Date: Oct 2009
Posts: 8
| | With the VX-8R I like the RF Concepts rfc 2-23. It is quite compact, covers 143-149MHz, and gives out 23W for 2W in (I get a bit more per my Bird), and
will give proportionally more for more input power, if you don't push it too much. I had this amp for about 15 years, for use with other HT's in portable mode, with a small gel cell battery. I don't know if it's still available, but it is
a great performer in a small package. | 
10-25-2009, 10:54 PM
| | Senior Member | | Join Date: Apr 2002
Posts: 4,156
| | The thing about the 2m/440 brick amps is that they are just pretty expensive, for what they are. For the price, you could buy a 2m/440 mobile radio and be done with it. That's why you don't see to many of them. If you can find one at a hamfest or swap meet for a good price, then they're worth picking up. The last two little amps that I bought for use with HTs were really cheap because I found them at swap meets. They were single band amps, however. | 
10-26-2009, 02:58 PM
| | Supporting Member | | Join Date: Apr 2005 Location: Oklahoma
Posts: 3,075
| | The other part of this portable thingy hasn't been mentioned yet, that I've seen. That's the power supply for the radio and amplifier when 'fixed'. I'm not going to try to make any recommendations about that, just be aware that you'll need it.
And as long as you're thinking about that "EMCOMM" stuff, think of a few of the other things that require some juice to operate, lights, clock, coffee pot, whatever? That's a little bit of a 'stretch', but dang, wouldn't that be nice??
- 'Doc
don't forget that @#$ pencil and paper... | 
10-27-2009, 09:38 PM
| | Junior Member | | Join Date: Oct 2009
Posts: 8
| | Quote:
Originally Posted by moleculo The thing about the 2m/440 brick amps is that they are just pretty expensive, for what they are. For the price, you could buy a 2m/440 mobile radio and be done with it... | Yeah, but we are talking about an APRS ready rig (VX-8R) that is "handheld."
Combined with a small 2m brick like the RF Concepts you get 25W out for 2W in and a small portable package. | 
10-28-2009, 01:10 AM
| | Supporting Member | | Join Date: Apr 2005 Location: Oklahoma
Posts: 3,075
| | How about something the size of a FT-7800 for that portable thingy? I know it isn't a hand held, and would require a sizable 'portable' power supply, but not any more than a portable/small amplifier would require. All it would take would be one small addition (<$100) and you'd have what you are looking for. Two bands even.
Of course that would mean a dedicated '7800, it wouldn't be used for anything else. But then, neither would that HT. Need a bigger box to put all that stuff in too. If you figure on getting all this stuff in your shirt pocket/back pocket, it's just not going to fit and be useful at all.
And then there's always that nasty thingy, cost. That suggestion above just cut your total cost in half without half trying.
- 'Doc |  | | Thread Tools | | | | Display Modes | Linear Mode |
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