John,
Thanks for the info. Actually the SG500 amplifiers are both 50 ohm input and
output. In the meantime I found some valuable data on the Communications
Concepts wesite.
Concerning the spark plugs: In my Toyota 7 seater van, the same type of plugs
are used. So far the ignition is not affected @ 600 watts out into the HiQ
5-80, but I am not shure what will happen with two SG500 amplifiers running in
parallel @ 1200 watts out. The main issue will be to get a stiff DC power
supply. Currently I use one 100 AH gell cell battery adjacent to the SG500, and
a 1 Farad capacitor connected to the SG500 DC terminals. For the second SG500 I
consider to use the same approach.
Best of luck with your 500 watt amp project, that should get your signal over
the pond!
Cheers, Dick
----- Original Message -----
From: Japerlick@aol.com
To: dick.knol@planet.nl
Sent: Thursday, February 10, 2005 10:02 PM
Subject: Re: [Amps] 3 dB mobile power increase
Dick
The combiner is not difficult at all...there are lots of
books/articles/papers to do it. You may have to have a two stage combiner, one
to convert the input to two 25 ohm sources then one to sum those to a 50 Ohm
output. You probably want to check out jerry Seviks "Broadband transformer"
book. He has written many articles in QST, ARRL pubs, etc. His latest book is
pretty good, low cost, adn would have plenty of ideas for you.
Good luck with this project. I run a 706 barefoot in my car with a HiQ 3-80.
My problem is extreme ignition noise...waiting for summer to track it down. I
have an Acura TL and it has little spark coils at each spark plug....so who
knows what problems I am gonna face! I am building a homebrew amp for my
car...using 4 MRF150's and other parts cobbled from Harris amps. It should be
good for about 500 Watts output.
John
K0UM
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|