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Re: 8566 to measure 100W FM transmitter
The spurious output may not be originating from the transmitter. Is it a stand-alone FM radio station, or does it share equipment rack, or mast, or antenna? Firstly see if you can borrow a bird
By Andy ZL3AG · #96741 ·
Re: 8566 to measure 100W FM transmitter
Hmmmm, the spur complaint is it an ¡°all the time¡± or intermittent? We had a 2M repeater that was plagued with spurs, turned out to be a paging transmitter turned up to allowed +25% mixing with
By Stephen Hanselman · #96740 ·
Re: 8566 to measure 100W FM transmitter
Thanks, if the transmitter has a RF sample I will use that
By DW · #96739 ·
Re: 8566 to measure 100W FM transmitter
I might as well add my two cents. I use a 30dB attenuator (300W) which feeds a 10dB directional coupler the tap goes to the SA and the direct goes to a HP 438. As many have mentioned be careful of the
By Stephen Hanselman · #96738 ·
Re: 8566 to measure 100W FM transmitter
Thanks for all the helpful inputs, I think I should probably invest in a portable analyzer that is not so heavy and a sampler. What I will use with what is available is the JFW 80db step attenuator, a
By DW · #96737 ·
Re: 8566 to measure 100W FM transmitter
There are several safe ways to do this.? What I do is put the transmitter on a dummy load and couple to the analyzer via a coaxial cable with clips on the other end, shorted together.? That makes a
By Bob Albert <bob91343@...> · #96736 ·
Re: 8566 to measure 100W FM transmitter
The reason for needing to measure this FM 99.1 transmitter is complaints of spurs so all I will be checking is if the expected signal is there and no spurs of that signal by turning the transmitter on
By DW · #96735 ·
Re: 8566 to measure 100W FM transmitter
I would use a directional coupler such as a HP778D to get a 20 dB sample. Then pad the sample port with a 30 dB pad. That will get you to 1 mW into the SA. Note that the 778d is rated for 50 watts cw.
By tmillermdems <tmiller11147@...> · #96734 ·
External Clock board for 332xx series
Hi fellows, Some years ago I made a external clock input board for my HP/Agilent 33220A. I offer two remaining PCB¡¯s few weeks ago on this site and they immediately gone. My question is, whether
By Milan Vasic · #96733 ·
Re: 8566 to measure 100W FM transmitter
What are you trying to measure, the fundamental, modulation, harmonics or what? #this will determine what bandwidth and accuracy you need Is the measurement off-air or into a dummy load. If a load a
By Robert G8RPI · #96732 ·
Re: 8566 to measure 100W FM transmitter
First of all you must be very strong. The 8566 A or B is somewhat over 100 pounds and very bulky, if you have to take it to the transmitter. I have one of each and try to never move them. I would keep
By Stuart Landau · #96731 ·
Re: 8566 to measure 100W FM transmitter
Why not just use a foot long piece of coax, any kind will do, make a pig-tail out of the far end and attach an alligator clip to the center conductor and just lay it on the bench. It will make a dandy
By Gedas · #96730 ·
Re: 8566 to measure 100W FM transmitter
I built one of these: ae6pm.com/SCCARA-GRAM_Articles/A_40_dB_Power_Tap.pdf You might want to use a larger resistor and make it a 50 dB tap. I use that for my amp output. Of course you have to
By Mark Goldberg · #96729 ·
Re: 8566 to measure 100W FM transmitter
I should add the 100W will be driven to an antenna on a tower, I don't have a sampler so I'm limited to what I can sample, hopefully the transmitter has a sample port
By DW · #96728 ·
Re: 8566 to measure 100W FM transmitter
I believe it is 99.1mhz I have a 90dB manual step attenuator so that should help some along with a resistor to help pad down the levels, how hot do sample ports usually run on small FM transmitters I
By DW · #96727 ·
Re: 8566 to measure 100W FM transmitter
Do you need to measure it on the air? What frequency is the Tx? Is there a sample port on the transmitter? Regards
By tmillermdems <tmiller11147@...> · #96726 ·
Re: 8566 to measure 100W FM transmitter
the best Thing woud be to use a power attenuator e.g. 40 dB /500 W plus another 10 dB attenautor between the? Output of the poer att and Input of the SA. Remember 100 W = +50 dBm, so an overlal
By Henning Weddig · #96725 ·
Re: WTB AMI/Mostek MK6220N RAM Chip
Adrian I guess only time will tell. But when I was getting the chip to temporarily work with heat, I barely put the tip of the soldering iron for more than 2-3 seconds on a pin solder junction, not
By Alex · #96724 ·
8566 to measure 100W FM transmitter
I have a 8566 and I need to sample the signal of a 100W FM transmitter. I haven't seen the transmitter but I was told the following below. Take a piece of wire and attach it to the end of the cable
By DW · #96723 ·
Re: TE FS -
Obviously I took on more than I can handle. I was hoping a few interested fellows would come over and we could work out some deals. That does not seem to be happening. I am overwhelmed by emails, only
By Mike Feher · #96722 ·
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