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FT736r front end transistor BF982
Hi Guys
The 144 MHz receive rf amp transistor had a mod which replaced the original with a bf982.This transistor has been discontinued and i was wondering if there was a more modern equivalent with a lower noise level.The BF982 is an N channel dual gate 20v 40ma to 200 MHz.Any helpful suggestions would be appreciated. Cheers Steve VK4ADA |
FT736r front end transistor BF982
Steve Kelly wrote:
Hi Guys The 144 MHz receive rf amp transistor had a mod which replaced the original with a bf982.This transistor has been discontinued and i was wondering if there was a more modern equivalent with a lower noise level.The BF982 is an N channel dual gate 20v 40ma to 200 MHz.Any helpful suggestions would be appreciated. Cheers Steve VK4ADA I took a quick look for crosses. The combination of 20V 40mA 1.2 dB noise is quite difficult to match. There are lower noise UHF devices but they tend to have 20V or 40ma max ratings. Perhaps you should just do the search for a BF982 supplier. They can be had, though you might pay couple or three bucks for one. Brian W |
FT736r front end transistor BF982
Please see
http://forums.qrz.com/showthread.php?t=141699 If 988/998 is an option and package is not important then Farnell has it.. Andreu, EA3CQY brian whatcott wrote: Steve Kelly wrote: Hi Guys The 144 MHz receive rf amp transistor had a mod which replaced the original with a bf982.This transistor has been discontinued and i was wondering if there was a more modern equivalent with a lower noise level.The BF982 is an N channel dual gate 20v 40ma to 200 MHz.Any helpful suggestions would be appreciated. Cheers Steve VK4ADA |
FT736r front end transistor BF982
On 29/05/10 00:13, Steve Kelly wrote:
Hi Guys The 144 MHz receive rf amp transistor had a mod which replaced the original with a bf982.This transistor has been discontinued and i was wondering if there was a more modern equivalent with a lower noise level.The BF982 is an N channel dual gate 20v 40ma to 200 MHz.Any helpful suggestions would be appreciated. Cheers Steve VK4ADA I have a couple of BF981 if they are a suitable substitute, new old stock, for sale on eBay at the UL below. Charlie. -- M0WYM www.radiowymsey.org Sales @ radiowymsey http://shop.ebay.co.uk/gnome7763/m.html? |
FT736r front end transistor BF982
Hey OM:
Give me a break, there is know way the front end is going to use 40 ma of current. What the heck do you think it's driving the freaking audio output? Firstly they aren't going to be using the front end in anything but class A. That makes the only parameters you have to looky at. are Vds, gain, Ft, and noise figure. Forget about Pd and Ids. Just looky at the drain resistor, says it all. |
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