<head><style>body{font-size:10pt;font-family:arial,sans-serif;background-color:#ffffff;color:black;}p{margin:0px;}</style></head><body><font color="#000000"><font size="2"><font face="arial,sans-serif"><br></font></font></font><blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Forwarded Message-----
<br>From: Tim ORourke <w4yn@earthlink.net>
<br>Sent: Jan 7, 2014 8:15 AM
<br>To: "hpsdr@lists.openhpsdr.org" <hpsdr@lists.openhpsdr.org>
<br>Subject: Amp alternative for Hermes, HPSDR
<br><br><zzzhead><style>body{font-size:10pt;font-family:arial,sans-serif;background-color:#ffffff;color:black;}p{margin:0px;}</style></zzzhead><zzzbody>I like to build amps and have done several now for our SDR rigs, Hermes and HPSDR.<br>They include Hercules(2), Munin, and now Eb104 design from Victor and his crew at Eb104.Ru.<br>Hercules and Munin are well know to group but you may not have seen much about the amps from Victor, UA3QLC.<br><div>They offer amp kits or assembled pallets from 10-900W and LPF to go along with these amps. Additionally they offer a BPF board the same size as Hermes.</div><div>I chose the 500mW to 300W pre-assembled board with LPF's and the BPF board.</div><div>The way I set it up with Hermes is to control BPF board (mounted in matching Hammond enclosure) from J16 on Hermes let BPF board control LBP's and amp.</div><div>From HPSDR I could control direct from db25 on Penny and use rx filters in Alex and LPF in amp, however since I had cables already made up I used their BPF's for HPSDR also.</div><div>Note more on cabling later. </div><div>The filter controls are set with external control output's for RX and TX per Victors requirements.</div><div>Using the BPF board it takes care of selecting correct outputs for LPF's on amp and provides attenuation on RX when TXing. </div><div>One could use Alex and use db25 direct to amp using different settings for RX and TX, have not tried this but it should work FB.</div><div>Bottom line is I have Hermes or HPSDR driving 300W amp with 300mW and have received great reports form the few qso's so far.</div><div>I need to drag service monitor into shack (major clean up needed first) to check the harmonic content however the results from others on their forum look favorable.</div><div>One requirement for their amps is 50V supply, this helps with harmonics, I picked up a nearly new 50V- 50A telcom supply off slee bay for a very reasonable price.</div><div>The amp only requires 15- 20A when used at 300W. </div><div>Later this week I will post more pictures on my Flickr Page, <a href="http://www.flickr.com/photos/71285665@N03/sets/72157638448913846/" style="font-size: 10pt;">http://www.flickr.com/photos/71285665@N03/sets/72157638448913846/</a></div><div>Cabling:</div><div>My goal was to use IDC cables to keep cabling as simple as possible. </div><div>This led to mounting the BPF's in matching enclosure, this allowed a short IDC cable from Hermes to BPF enclosure where I broke out signals needed to BPF and captured signals needed for amp. From BPF to amp is another IDC cable. Later this week you will see this on Flickr.</div></zzzbody><pre>
Tim O'Rourke
W4YN@ARRL.Net
Low Power Amateur Radio Rocks
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member</pre></hpsdr@lists.openhpsdr.org></w4yn@earthlink.net></blockquote></body><pre>
Tim O'Rourke
W4YN@ARRL.Net
Low Power Amateur Radio Rocks
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member</pre>