habamp use as amp for a DTX1 ??

[G4HTZ]

just getting the bits together for 70cms DATV
bought a DG0VE converter and have a tetra amp on its way

on the TX side am considering the DTX1

I have a HABAMP which i was going to use as a preamp before I bought the DG0VE converter

would the HABAMP be suitable to use as a amplifier for the DTX1...it produces about 27dbm at 70cms followed by a filter...if so I could use this as a low level drive for the tetra amp

[M0DTS]

Hi Steve,

The HABAMP will give about 30mW from DTX1 if the gain figures are correct.
But the problem looks like the filter, it rolls off by about 5dB from 437-438MHz where we normally operate.

Rob

[G4HTZ]

Ok rob
Thanks for info
Steve

[2E0DTX]

Hi -

Why not take a look at the filter here http://www.dtx1.info/NewProducts.html

The DTXF-70 would be the one to look at.

73's

Laurence 2E0DTX

[G4HTZ]

Need to get power up from the -5dbm to a few watts ...will need a amp of some kind to take the low level

[g4wvu]

IIRC the Nokia Tetra amplifier lumps can be driven from as low as -15dBm if you include all the drive stages - don't have details to hand but will look out shortly.

[g4wvu]

On Robs site some details specifically low level drive

http://www.m0dts.co.uk/?tag=432MHz&item=68

[G4HTZ]

Yes will have to investigate that mod further
Cheers
Steve

[g4wvu]

Good luck - I will be doing similar when I get around to modifying the Nokia lump I have here. I will look to about 0dBm level as I have a MMIC drive amp in my DTX1 to raise it to a comparable level as an SR Systems TX (max about +6)
I will leave high bias level on the amp as original I think (linearity)

73s

Mark

[G4HTZ]

Ok mark
May be possible to work you on 70cms atv some time
Often get gb3lo and TN down here on 24cms with a slight lift
Good luck with tha amp ...still waiting for mine to arrive
Regards
Steve