[Repeater-Builder] Re: GLB Preselector
Thanks, This one had different marking, but could have been changed. I'll put a 901 in it and see how it does. Dwayne --- In Repeater-Builder@yahoogroups.com, Joe <[EMAIL PROTECTED]> wrote: > > I have a GLB Model P-147.49 that was custom made for me years ago. It > use an MRF901 device. > > 73, Joe, K1ike > > ldgelectronics wrote: > > > > Anyone know the device number of the gaasfet (or whatever type it is) > > in the P-145 model? > > > > Inherited one with -12 db gain. Looks easy enough to fix. > > > > Thanks, > > > > Dwayne Kincaid > > WD8OYG > > > > >
[Repeater-Builder] Re: GLB Preselector
I ended up with 220 pre-selector unit mentioned earlier. I'll look through the paperwork to see if I have the instructions. skipp > "k0jxi" <[EMAIL PROTECTED]> wrote: > Anybody know the proper tuning procedure to peak up/ move freq for > the GLB preamp/preselector to maintain the rated selectivey? > > Dale K0JXI 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/
Re: [Repeater-Builder] Re: GLB Preselector
Here is a few photos of what mine looks like. The circuit board is labeled on the top "P40-500". 73, Joe, K1ike ldgelectronics wrote: > > > Thanks, > > This one had different marking, but could have been changed. I'll put > a 901 in it and see how it does. > > Dwayne > > . > >
[Repeater-Builder] Re: GLB Preselector- Preamplifier Response Plot
Excellente' Any chance you can park a copy of it in the group files section for those of us who don't receive attachments when we read the group via a web browser? s. > "Eric Lemmon" wrote: > For those readers who are unfamiliar with the GLB > Preselector Preamp, I have attached a network analyzer > plot of the 220 unit I have. > 73, Eric Lemmon WB6FLY >
Re: [Repeater-Builder] Re: GLB Preselector- Preamplifier Response Plot
Anyone have a schematic?
Re: [Repeater-Builder] Re: GLB Preselector- Preamplifier Response Plot
At 11/27/2009 18:33, you wrote: >Anyone have a schematic? Or noise figure measurements? Or P1dB measurements? I'd expect the P1dB to be quite reasonable, perhaps a couple of dB better than a typical GaAsFET due to the loss of what filtering it does have on the input side of the preamp. I'm most curious as to the NF, & the P1dB as a function of input freq. The latter will tell you how narrow the input filters are. Bob NO6B
Re: [Repeater-Builder] Re: GLB Preselector- Preamplifier Response Plot
As far as I know, GLB never made the schematic available. I posted to the FILES area what I received with the preamps that I had purchased over the years. I've used them on all three bands with good luck. Skipp was trying to reverse engineer one I sent him. 73, Joe, K1ike DCFluX wrote: > Anyone have a schematic? > >
[Repeater-Builder] Re: GLB Preselector diagram and spicey (spice modeling)
I have that information and I did reverse out the diagram portions I was interested in detailing, which are the different bias schemes for the different active devices. I'll happily make that information available when I locate that buried folder. Today might be a day to slightly clean up the office paperwork stack. A friend and I are casually setting up to run models of both wide and narrow band RF Pre-amplifiers. The subject has already started an interesting email debate with another group of friends. The termination Z (impedance) actually seen by the preamplifier does affect the IMD. How much and where is what we hope to get a better look at. s. > Joe wrote: > As far as I know, GLB never made the schematic > available. > I posted to the FILES area what I received with > the preamps that I had purchased over the years. > I've used them on all three bands with good > luck. Skipp was trying to reverse engineer one > I sent him.
[Repeater-Builder] Re: GLB Preselector diagram and spicey (spice modeling)
both... we already gone through some of it and sorting the results is a lot of work. s. > Joe wrote: > > Input, output or both? > > Joe > > skipp025 wrote: > > The termination > > Z (impedance) actually seen by the preamplifier does > > affect the IMD. How much and where is what we hope > > to get a better look at. > > > > s. > > > > >
Re: [Repeater-Builder] Re: GLB Preselector diagram and spicey (spice modeling)
Input, output or both? Joe skipp025 wrote: > The termination > Z (impedance) actually seen by the preamplifier does > affect the IMD. How much and where is what we hope > to get a better look at. > > s. > >
