[amsat-bb] input power question

Sun Jun 16 22:37:45 UTC 2019

I have an Mast Head preamp for sale Yaesu AG-35 $145 including shipping.

- Paul

At 02:18 PM 6/16/2019, Mark D. Johns via AMSAT-BB wrote:
>Ken, Others have already chimed in with some 
>others. I'm partial to the Mini-2 and Mini-70 
>from http://www.shf-elektronik.de/en/ -- Mark D. 
>Johns KÃ˜JM / MÃ˜GZO / ex-9H3DJ / ex-KÃ˜MDJ 
>Brooklyn Park, MN USA   EN35hd 
>----------------------------------------------- 
>"Heaven goes by favor; if it went by 
>merit,    you would stay out and your dog would 
>go in."     ---Mark Twain On Sun, Jun 16, 2019 
>at 11:18 AM Ken M via AMSAT-BB 
><amsat-bb at amsat.org> wrote: > > Hello Mark, > > 
>Picking up on your comment about UHF pre-amps 
>that "can be had for less > than $150 from 
>several manufacturers", could you provide a list 
>or some > suggestions. I haven't searched 
>exhaustively but some of seen are north > of 
>$300 and I would love to find a less expensive, 
>but quality, option. > > Thanks & 73, Ken, 
>VA7KBM > > On 2019-06-16 6:46 a.m., Mark D. 
>Johns via AMSAT-BB wrote: > > This is a very 
>common issue for newcomers to the linear 
>satellites. > > Almost every pass, there is 
>someone calling CQ over and over again > > with 
>a loud signal, but completely oblivious to the 
>several stations > > trying to answer 
>them. > > > > Downlinks on the linear 
>satellites, especially on UHF, are MUCH 
>weaker > > than on the FM satellites. Remember 
>that the transmit power of the > > satellite is 
>being distributed across an entire passband that 
>many > > stations are sharing -- unlike FM, 
>where all the power is just on one > > frequency 
>for one station at a time (ideally). > > > > You 
>are going to need the best, low-loss feedline 
>you can afford for > > UHF, and that feedline 
>needs to be as short as possible. If your > > 
>feedline is more than about 50 feet (or about 15 
>meters) you are going > > to want to have a 
>pre-amplifier very near the antenna. A good 
>pre-amp, > > with RF switching so that you don't 
>accidentally blow it up by > > transmitting 
>through it, can be had for less than $150 from 
>several > > manufacturers. Or, there are designs 
>around to roll your own, if you > > are good at 
>that sort of thing. > > > > Good luck, and hope 
>to work you on the linear sats very soon! > > 
>-- > > Mark D. Johns > > KÃ˜JM / MÃ˜GZO / 
>ex-9H3DJ / ex-KÃ˜MDJ > > Brooklyn Park, MN 
>USA   EN35hd > > 
>----------------------------------------------- > 
>  > "Heaven goes by favor; if it went by 
>merit, > >     you would stay out and your dog 
>would go in." > >      ---Mark Twain > > > > On 
>Sun, Jun 16, 2019 at 7:26 AM WB8PFZ via AMSAT-BB 
><amsat-bb at amsat.org> wrote: > >> I have 
>completed my sat station but am having trouble 
>hearing myself. I have checked cables and 
>antenna ( M2) sat antenna. All seems well with 
>low SWR. I can hear on the 2 meter downlink. How 
>much power is needed on the UHF uplink? Hope to 
>figure this out shortly. This is being done on 
>the SSB sats. Thanks Mike WB8PFZ > >> 
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>worldwide without requiring membership. Opinions 
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>not reflect the official views of AMSAT-NA. Not 
>an AMSAT-NA member? Join now to support the 
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