| Electronics > Repair |
| Wavetek 2520a 0.2-2,200MHz RF sig gen repair |
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| dazz1:
Hi IC121? |
| Jeff eelcr:
Glad you got it going nice peice of equipment enjoy it. Jeff |
| Abel:
Hi Dazz1, I left a PM with you; if you do not get it in your Inbox, please check your Spam, you never know... Best regards AB |
| dazz1:
--- Quote from: Abel on September 26, 2022, 02:10:27 pm ---Hi Dazz1, I left a PM with you; if you do not get it in your Inbox, please check your Spam, you never know... Best regards AB --- End quote --- PM received. |
| dazz1:
Hi The Wavetek is backlit with a green electroluminescent (EL) panel that gives a nice even glow, but after about 35 years, it is looking a little weak so I started looking at options. EL panels have a limited life which explains why the Wavetek has a switch on the back to turn the EL on/off. Eventually I found 50cm x 3cm EL panels on Aliexpress. I ordered the aqua colour because it is white when off. It is also very close to the original EL colour. I ordered it and fitted it. It is very difficult to show how bright the new EL panel is but if you look carefully, the LCD contrast is relatively low. Contrast improves with higher angle of view from slightly above. The EL panel is almost too bright for the LCD, but not to the eye. Typical EL panels cannot be cut so I just left the surplus length to illuminate the interior of the enclosure. Given that this was a one-for-one swap of new for old, this was a very easy mod. The new EL panel came with an inverter that only produces 67VAC. The Wavetek inverter provides 90VAC, but the LCD polarizing film reduces the light output. I also replaced the wiring the the EL panel because this looked suspiciously like copper clad aluminium. This turns to powder after a while. So not only is the WaveTek working, it now looks very cool with its new blue backlight. As an added bonus, I think the external phase modulation option has started working after trying some GPIB commands. I haven't tested it yet, but the button puts it into the correct mode. |
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