At 6/8/2005 10:41 AM, you wrote: >Dave, > >A relatively easy thing you can do is to put a Mastr II exciter in a >shielded box with a BNC connector for output. You can easily connect >attenuators directly to the box in line to get your weak signals. This >works on both VHF and UHF. You can also add a small audio oscillator to >modulate the exciter if you like (comes in handy if you have a Sinader). > >73, Tony W4ZT
If you have a 12 MHz DDS or function generator, you can feed the MastrII exciter with that. They seem to need about +10 dBm @ 12.xx MHz. They put out around +20 to +23 dBm (the one I have on the bench right now does 184 mW @ 450 MHz). You'll probably never need even close to that much power, so you can probe-couple to a BNC bulkhead connector (short wire on the center pin inside the box). This is what I did with a Yaesu FT-708 HT inside a shielded Al box with EMI feedthroughs. The probe-coupled signal coming out of the BNC still needed a lot of attenuation to get to reasonable levels for tuning RXs, but it worked very well. I ended up using it as the 2nd CW source along with my FM-10 for doing 2-tone IMD measurements. Another possibility is to find a cheap synthesizer on eBay. Example: <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=97198&item=7520623309&rd=1> Not cheap compared to the old free-running oscillators previously mentioned, but much less expensive than an IFR-1200. There were also a number of Singer CSM-1s going pretty cheap a few months ago. AM only so only good for a CW generator. Bob NO6B Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
