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| Budget RF audio generator options for tuning radio receivers |
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| colorado.rob:
You need a signal generator that can go from 500kHz to 110MHz to cover AM and FM broadcast bands. This is required for testing and adjusting AM and FM receivers. And you need a signal generator that can do CW, AM and FM modulation. The SDG2000X is the least expensive piece of test equipment I know of that can do the frequency range and modulation types you need, unless you start looking at used test equipment. You can do it with an inexpensive FY6900 signal generator for the AM band. And a HackRF with the Portapack can cover FM. But I think once you purchase both items, it will cost the same as the 40MHz SDG2000X. Deals can be found on used RF equipment. If you can pick up an older HP, Marconi, Rohde & Schwarz, etc RF signal generator that meets your needs, you'd have a much better tool for the work you are doing. There are a number of inexpensive (~$200) Wavetek RF signal generators available on Ebay in the US right now that would meet your needs. (I know that this does not help you, outside the US. It's just an example.) |
| Aldo22:
--- Quote from: RiRaRi on September 18, 2023, 10:21:05 pm --- i was thinking that this could be cheaper. Around 50-100 €/$. This does not work? --- End quote --- There are also cheap little transmitters on Aliexpress. No idea if these could be useful for you: https://www.aliexpress.com/item/1005005593130961.html https://www.aliexpress.com/item/1005004907484326.html https://www.aliexpress.com/item/1005005334451938.html Just randomly picked. |
| RiRaRi:
Acctualy, compared to 700EUR+ Siglent these cheap Aliexpress items seams great ;D ;D I think the best solution would be tinySA for FM modulation. For AM modulation to use tinySA as spectrum analyzer to check the precise frequency when transmitting with shown aliexpress item. Would you agree? |
| Aldo22:
--- Quote from: RiRaRi on September 19, 2023, 01:52:57 pm ---Acctualy, compared to 700EUR+ Siglent these cheap Aliexpress items seams great ;D ;D I think the best solution would be tinySA for FM modulation. For AM modulation to use tinySA as spectrum analyzer to check the precise frequency when transmitting with shown aliexpress item. Would you agree? --- End quote --- Why not? But the TinySA can also do AM, just like FM with stairs in the audio signal. In the attachment 2kHz on 10MHz directly into the DSO2512G. Below 8MHz carrier. |
| RiRaRi:
Nice. So what is disadvantage of these "stairs"? If i can see freq on scope and if i can hear the sound on my receiver on the same freq i cant see any disadvantage in terms of aligning the radio, or am i wrong? |
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