Re: ARR pre amp Query
The more expensive "mast mounted" versions (MSP432VDG-160, $240 and MSP432VDG-25, $190) come with a power connector, but the RF switched SP432VDG, $120 (25w rating) does not. You have to solder or clip the wire for the +13vdc to the top of a feedthrough, and the wire for the -13vdc to a solder lug attached to a screw on the chassis. Yes, a bit crude. See http://www.advancedreceiver.com/page37.html
By the way, the "RF switched" preamps come standard with BNC connectors. You can buy them with N connectors for an extra $10, but they will not sell them with UHF connectors (SO-239). The "mast mounted" versions come standard with N connectors.
73, Bill NZ5N
Hi Bob,
The Advanced Receiver pre-amp that I purchased (MSP432VDG-160) came with the power connector. You will need to solder the wires to the connector. I found some old RG-58 that I used to run the power to it.
Very nice pre-amp by the way.
73, Jeff K7WIN ----- Original Message ----- From: [email protected] To: [email protected] Sent: Monday, March 31, 2008 8:04 AM Subject: [amsat-bb] ARR pre amp Query
I am thinking aobut ordering an ARR pre amp for
432,,, I see the pin for
12V DC,,, what type of connector does this take, or
do you have to solder
the? wire to the pin? That seems a bit crude. Canby one use the ARR product, and how do you
connect the 12V to it?
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Very timely discussion for me as the snow sloooowwly disappears and the return of the Canada geese and robins signals the time for tower work :-)
Some previous comments suggest that a preamp near the rig is not significant, but, I suggest otherwise as my Ft-847 internal preamps can make a significant difference in RX. Anecdotal, not empirical, but I can hear the diff at the push of a button.
Now, I am consider mast mounted preamps as an alternative to my FT-847 internal preamps for one of my sites. I run Landwehr VHF and UHF preamps at 2 other locations and they are terrific! They are also almost 20 years old and no longer available :-(
The preamps on the AR2 site look like what I could use.
My questions are... Is the sequencer
http://www.advancedreceiver.com/page20.html
really necessary or recommended when using the MSP432VD-25 or MSP144VDG-25 preamps? My first thought is NO. 15-20 years of use of 4 Landwehr preamps without a sequencer is my rational.
Finally, does anyone have a nice "warranty voiding" hack to get around the these different power connectors we see on indoor preamps and down converters such as my KEPS http://www.keps.it/images/13lnc72db_m.jpg ? Instead of soldering to the pin and a ground lug
http://picasaweb.google.com/ve4yz.alan/24Ghz/photo#5172119570416133618
Something as simple as removing the connector from the case and running a cable through the remaining hole, soldered internally with something like Anderson Power Poles at the other end for 12VDC????? I'm going to do it one day, but would rather have someone else confirm that it would work without adversely effecting performance characteristics. No guts; no glory here.
Thanks for any feedback
73, Alan VE4YZ EN19kw AMSAT LM 2352 http://www.mts.net/~ve4wsc/ AMSAT A-485
participants (2)
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Alan -
Bill Dzurilla