Loops MLA 30+ Bias-T Power Source Question

[sunwave]

I placed an order for a MLA 30+ on Amazon. I should have it sometime tomorrow.

When I get it unpacked and assembled, I want to use the bias-T voltage from my RSP1a to power the MLA 30+ loop amplifier. Do I need the small power supply box or totally go directly to the amplifier/balun box?

 

[Ubbe]

It's a voltage converter in the included bias-T adapter. I think the antenna runs on 12V but perhaps it will somewhat still operate on 5V but with reduced sensitivity.

/Ubbe

 

[sunwave]

It's a voltage converter in the included bias-T adapter. I think the antenna runs on 12V but perhaps it will somewhat still operate on 5V but with reduced sensitivity.

/Ubbe

If someone has posted a complete and thorough explanation of the MLA 30+ I would appreciate a link to it.

I want to know if the MLA 30+ will accept bias-t voltage from the RSP1a to the power box.

 

[morfis]

I want to know if the MLA 30+ will accept bias-t voltage from the RSP1a to the power box.

If you connect the antenna direct to your sdrplay it can power the antenna. I found it worked marginally better using the supplied bias-T box and a clean higher amperage supply (tested versus rspduo, airpsy R2, rtl-sdr.com dongle and nooelec dongles)

However, I'm not one of the mla30 fanboys and have found them to be barely worth their cost. Removing the nasty supplied co-ax and putting a BNC connector (SMA might be eaier size) on the antenna box allowed the use of real co-ax instead of the **** supplied lead but the antenna was still pretty poor.

 

[Ubbe]

MARTIN - G8JNJ

Martin - G8JNJ - ECLECTIC AETHER - Radio Related Ramblings. Information, reviews and projects relating to Amateur Radio and associated interests DC to Daylight

www.g8jnj.net

The power box has a DC blocking capacitor on its coax output to the receiver.
The amplifier IC has a specification that goes down to 6V as the minimum and the RSP1a outputs 4,7V

/Ubbe

 

[sunwave]

If you connect the antenna direct to your sdrplay it can power the antenna. I found it worked marginally better using the supplied bias-T box and a clean higher amperage supply (tested versus rspduo, airpsy R2, rtl-sdr.com dongle and nooelec dongles)

However, I'm not one of the mla30 fanboys and have found them to be barely worth their cost. Removing the nasty supplied co-ax and putting a BNC connector (SMA might be eaier size) on the antenna box allowed the use of real co-ax instead of the **** supplied lead but the antenna was still pretty poor.

I have been hearing some pretty good reports on the MLA 30+ which outweighed the negative responses looking at several sources that allows people review the item.

 

[ccopeland58]

MARTIN - G8JNJ

Martin - G8JNJ - ECLECTIC AETHER - Radio Related Ramblings. Information, reviews and projects relating to Amateur Radio and associated interests DC to Daylight

www.g8jnj.net

The power box has a DC blocking capacitor on its coax output to the receiver.
The amplifier IC has a specification that goes down to 6V as the minimum and the RSP1a outputs 4,7V

/Ubbe

The amplifier IC (NE592) can work down to 3V but that limits the bandwidth down to 60mhz. The RSP1A 4.7Vdc should work okay.

NE592N14 datasheet(6/8 Pages) PHILIPS

Philips Semiconductors RF Communications ProductsProduct specificationNE592Video amplifierApril 15, 1992255TYPICAL PERFORMANCE CHARACTERISTICS (Continued)Gain vs. Frequency as aFunction of Supply VoltageVoltage Gain Datasheet search, datasheets, Datasheet search site for Electronic Components...

html.alldatasheet.com

 

[prcguy]

I have an older MLA-30 and on the antenna box it says 5 to 12v at 40ma. I did not get the original bias Tee but I think it was powered by 5v USB.

 

[sunwave]

The amplifier IC (NE592) can work down to 3V but that limits the bandwidth down to 60mhz. The RSP1A 4.7Vdc should work okay.

NE592N14 datasheet(6/8 Pages) PHILIPS

Philips Semiconductors RF Communications ProductsProduct specificationNE592Video amplifierApril 15, 1992255TYPICAL PERFORMANCE CHARACTERISTICS (Continued)Gain vs. Frequency as aFunction of Supply VoltageVoltage Gain Datasheet search, datasheets, Datasheet search site for Electronic Components...

html.alldatasheet.com

G8JNJ website says page not found

 

[Ubbe]

The webpage are under construction. The wayback machine can give you the old stored webpage.

G8JNJ.NET

UNDER CONSTRUCTION See my old site on the Wayback Machine Use this direct link https://web.archive.org

g8jnj.net

/Ubbe

 

[sunwave]

Ya all that is fine but I am not a DIY guy.