KR> Instrument panel wire(antenna)
On 12/2/2011 10:58 AM, Dave_A wrote: > The reason I said 58U is that (From what I'd seen online) 58 U foam-core > has some of the lowest attenuation of the 'common' cable types (1.7db, > IIRC) > I don't disagree with you. I've used it with great results, as have many people over the years. I'm not starting an argument (this is more for my own personal education), but I just don't see much of a benefit... at least that would drive me to rip it out of my plane. Yes, it's true that lower loss is better, but what range increase will you really see? I did some calcs to highlight the differences between the two cable types. Granted, they are simple and there are many other variables that I won't pretend to know about, but here it is: Parameters - 15 ft Coax Length 1:1 SWR (assumed) 8W Carrier Output Power Results - RG-58 - 6.8W Output Power (.69dB total loss) RG-8X - 7.0W Output Power (.58dB total loss) Perhaps it's more of a question about how far you can receive? Glenn, if so, can you show me? I just don't know. Matt
KR> Instrument panel wire(antenna)
On 12/2/2011 7:14 PM, Matt Elder wrote: > On 12/2/2011 9:32 AM, Glenn Martin wrote: >> Not RG-58. Too lossy. Use RG-8X instead. > You say too lossy. At the frequencies we run at, what's the difference > in attenuation? > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html The reason I said 58U is that (From what I'd seen online) 58 U foam-core has some of the lowest attenuation of the 'common' cable types (1.7db, IIRC) It worked well enough for 10Base2 Ethernet (And yes, I actually have worked with/used 10Base2 in the past... It was simple, and it worked (until 10mbps became too slow))
KR> Instrument panel wire(antenna)
On 12/2/2011 8:44 AM, Matt Elder wrote: > On 12/2/2011 9:32 AM, Glenn Martin wrote: >> Not RG-58. Too lossy. Use RG-8X instead. > You say too lossy. At the frequencies we run at, what's the difference > in attenuation? > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > at 100 MHz: rg-58u: 4.5db/100 ft rg-8x: 3.1db/100ft LMR-400: 1.2db/100ft (a larger diameter cable, but relatively lightweight) this provides a MAJOR improvement in received signal strength over RG-58 (50% less loss) -- Glenn Martin, KR2 N1333A, Biloxi, MS
KR> Instrument panel wire(antenna)
On 12/2/2011 9:32 AM, Glenn Martin wrote: > Not RG-58. Too lossy. Use RG-8X instead. You say too lossy. At the frequencies we run at, what's the difference in attenuation?
KR> Instrument panel wire(antenna)
On 12/2/2011 3:08 AM, Dave_A wrote: > I'm assuming RG58/U for antenna wire... > > ___ > Not RG-58. Too lossy. Use RG-8X instead. -- Glenn Martin, KR2 N1333A, Biloxi, MS
