If you protect the P3 input with some back to back diodes, put a piece of wire on the IF input, dial up the P3 IF to the the freq you wish to listen to, and the P3 will show you the received signal. I think the caveat is to protect the input to the P3 or you will burn it up..
Merv K9FD/KH6 > Hi Don: > > Thanks for the response. > > Maybe Im not clear regarding what Im trying to do. > > I have a dozen TenTec Orion 1's at a multi multi operation I > play at. Im tasked with "standardizing" the audio > parameters for this operation in regards to compression and > frequency response before CQ WW SSB. We want to make sure > that all the rigs sound as good as they can sound and have > consistent levels. People play with these radios over the > ensuing months, so they are usually diddled to death by the > time I get there. > > I have done this in the past "by ear". That is, I have > plugged a given rig into a dummy load and diddled with the > audio settings until I got it to sound "right". I wrote > down all the settings and went to another radio. I set that > radio on a dummy load and input all the settings I wrote > down on the first radio. I used the same microphone, the > same audio path and made sure the radios were at the same > software revision. Lo and behold, the second radio sounds > different than the first with exactly the same numbers in > the software! I have found in practice that no two Orions > sound the same, using exactly the same numbers and exactly > the same microphone and exactly the same voice (mine). > > What I want to do is inject pink noise from a Flash Memory > WAV player that has a track from the NAB Audio Reference > disk. I have the WAV player set to loop the file forever. > Feeding it through a Radio Design Labs line level to mic > level amplifier block, the level coming out is 0 VU mic > level at a nominal 600 ohms impedance. I want to feed this > into the mic input of the Transceiver under Test and, with a > "spectrum analyser" looking at the output of the audio > monitor circuit (yes, not ideal, but it gets me in the > ballpark) "see" where Im at. I trust my ears, but it would > be nice to be able to see the waveform on the SA. Knowing > where I am at, I can then adjust the rig's settings and even > "pre-distort" the audio input from external processing > (several transceivers are driven through W2IHY processors) > to optimize drive, punch and inteligibility. > > As I said, I have done this "by ear" in the past. But now I > have a P3. I can do exactly the same thing on my personal > K3 by disconnecting the serial connection. I can then see > the output of the rig in the P3 via IF leakage, and I was > able to look at what pink noise looks like at my personal > station and the effect of applying EQ to the pink noise > VISUALLY on the P3. I could do what I have to do faster on > the Orions if I could SEE the waveforms. It would save me > time I can use otherwise at this station. > > What I would like to know is if the P3 can, using any IF > leakage from the Orion's IF out, do the same thing as I can > do on my K3. Im not looking for any laboratory grade results > here, Im just looking for a ballpark image of the modulation > envelope that includes frequency domain information so I can > judge the "flatness" (or lack thereof) of the audio > frequency response of a given Orion rig. This way, I can > twiddle the knobs and "match" the rigs as closely as > possible to a "consistent" starting point since the same > identical numbers dont seem to have indentical results > across Orions as they do on K3's. If the numbers gave > repeatable results across several Orions, I wouldnt have to > do this! I would just input the numbers into all the rigs > and have a consistent starting point for tweaking. > > I want to use what I have on hand, I dont want to go out and > spend money or time building things. If I was still at my > old TV station, I would borrow the Tek Spectrum Analyser at > the transmitter, or the Anchor audio analyser at the studio > and be done with it, but I dont work there anymore and dont > have access to these tools, so I wanted to use what I had on > hand. > > Guess I will just have to try it and see if it works! Or > maybe I will look on the web for a freeware or shareware > audio baseband spectrum analyser which runs on a PC laptop > which I can then plug into the headphone output of a given > Orion and observe the waveform there. > > I was just curious if someone had used the P3 for something > like this in the past. > > -lu-w4lt- > > Message: 17 > Date: Sun, 23 Oct 2011 23:40:35 -0400 > From: Don Wilhelm<[email protected]> > Subject: Re: [Elecraft] P3: Can the Panadapter be used with > a Ten Tec > Orion 1? > To: [email protected] > Message-ID:<[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Lu, > > I don't like to discourage list members away from Elecraft > products, but > I do not know if the P3 will do the task you are asking > about - it > depends on what other equipment you have to use along with > the P3. Yes, > the P3 can do the job IF you have the other equipment to run > it for your > immediate purposes. > > I would suggest that you also investigate the "Simple > Spectrum Analyzer" > by G4AON used in conjunction with Spectrogram or SpectrumLab > or other > computer based FFT audio spectrum analyzer. > You can find information on the resistive tap and the mixer > at > http://www.astromag.co.uk/ssa/. This is an adaptation of > the 40 dB > resistive tap from the W7ZOI Power Meter along with a mixer > to bring the > signal down to baseband where it can be analyzed with an > audio FFT > spectrum analyzer. > > 73, > Don W3FPR > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
