Going through an old Hy-gain CB radio and the alignment calls for a 27.115MHz signal with 30% 1kHz AM. The frequency and modulation are fine but my AWG's minimum amplitude is 1.0mVpp and I need 10-100uVpp. I can put a trimmer pot in series with the signal line to attenuate it but is there a better solution? I haven't tried my old analog tubed Heathkit RF Signal Generator as it would be very difficult to get it exactly on frequency and AM specification. (yes, I'm getting spoiled by all this newfangled digital pushbutton stuff)

 

A pot with s resistor 9 times higher in series would give you an output of 0-100 uV from your 1mV input.

 

@27MHz you need to use 'real' RF components if you want good results. Use (if you don't have a variable attenuator) one or more 10 DB inline attenuators (~1/3) to bring the voltage in spec from the signal generator.

 

Hello,

Perhaps something like this to attenuate the signal:
https://www.box73.de/product_info.php?products_id=4745
Or a single attenuator:
https://www.box73.de/product_info.php?products_id=4283

Bertus

 

The alignment spec. calls for 10 & 100uVpp which my DMMs are capable of. However, not at above 1MHz! Which means going to the scope at that frequency and amplitude. At that low an amplitude the scope will be noisy and not so accurate. Put an offer in on a used but working HP8648B 9kHz - 2GHz RF generator which has up to -100db attenuatian internally. Along with lots of other bells and whistles. With my present ones I can get the frequency and modulation but can't get amplitudes less tha 1mV. I went ahead and aligned the receiver section with what I had after putting a 5kΩ pot in series (along with the volume pot and kept the signal meter from pegging) but need exact output amplitudes to go further. Always something but slowly getting the bench instuments I need to work on my RF gear...

 

I also picked out a switchable variable step attenuator on eBay since I will need one anyway for scope inputs. -82db for ~20$ plus shipping. They also have a powered and step settable one in -1db increments up to -31db for a nice price. I'll put it on the input to my spectrum analyzer and check its attenuation values on it when it gets here.