开云体育

I've always used Zeners as noiwe generators but have a collection of LEDS. I'll have to give one or several LEDs a try! NoiseCom makes quite a line of noise diodes if you want something "standard" to

The S-meter stays deflected, same? as without attenuation can be seen in the photo. Yes , I have used a DMM and analog multimeter, same lecture 1,7 v no variation tweaking the coils.

For the DMM (voltmeter) are you attaching to the DC level of the AGC or possibly the downconverted IF signal in the first IF? The DMM will not see RF energy at the IF frequency. Also, most AGCs I've

What does the S meter do with the additional attenuation? Dose it still say at full scale? Jeff ________________________________________ Sent: Saturday, May 24, 2025 17:45 To: [email protected]

No , it does not change the voltage when the generator is off. I have just tried placing a 30 db attenuator in the probe but same results. I have also added a toggle switch attenuator ,100 db, and no

Something else to check is does the agc voltage change with the RF Gain control? 73 Jeff G8HUL ________________________________________ Sent: Saturday, May 24, 2025 17:12 To: [email protected]

Does the agc voltage on the multi-meter change with the generator off? I can only conclude from what the S meter is doing that the generator level is too high even at minimum, but that does not

Yes, I have checked several times that the signal is injected, I can heard the tone and adjust T17 for zero beat. The probe is in the correct location, although the manual indicates two white/green

The alignment in question if for the 50kHz IF of the Drake Rx. Unfortunately the manual does not give an i/p level for this step, just set it such that there is a slight deflection in the agc voltage.

Are you positive that you are a) injecting signal, and b) probing, in the correct locations? Also you said that the S meter went to full scale, does this happen with both the TinySA and the HP

I read the manual. The lowest RF on the Drake SPR4 is 150 kHz. Sensitivity (i.e. before AGC reduces gain) at 10dB (S+N)/N is 0.25uV SSB/CW/RTTY (i.e. BFO mode) and 0.5 uV AM 0.5 uV is -113 dBmW

I recall a really simple noise generator circuit from a magazine (something like Practical Wireless, in the U.K.) in the 1970s which used a reverse biased green LED, two 9V batteries in series, a pot

The HP209A is used in applications likely wanting -20 dBm to +10dBm. The RF input of a communications receiver might be -110dBm (AGC at max gain, signal just above noise) and about -80dBm to -70dBm

David, I am aware that you stated Ham Radio. I've searched their archives as well as their cumulative indexes with no results. There are 269 Ham Radio editions in the index, from Feb 1968 to June

On some receivers, the S Meter will go towards full scale as the RF Gain is turned down and the receiver goes to low sensitivity.. > > >

It was in HAM RADIO, *not* QST. I noted that in the email. Try the archives of HAM RADIO magazine. Dave - W?LEV [email protected]> wrote:

Hi Dave, There are two noise source articles in QST. January 1977 pp 22 "Gated Noise Source" May 1994 pp37 "Calibrated Noise Source" Is the January 1977 the article you are referring to? Regards,

The best ever ham radio publication, Ham Radio, once published a relatively simple project: a "Gated Noise Source". I built and extensively used one from MF, HF, VHF, UHF, and through 1296. Search the

Yes, but the issue is that whatever the output level is there is no a slight deflection , it remains stuck always in 1,6 volts. I have tried with? all levels that the Tiny gives. Right now? I attach

Sorry, there will be NO noise generator inside the tinySA Topic closed -- Designer of the tinySA For more info go to https://tinysa.org/wiki