Thanks Roger
aha, it was c6 and not c11 . My mistake.
LA5VNA Steinar
loc:JO59jq
Mal and spam filtering: STRONG
www.opera.no
Den 21.10.2012 12:38, skrev Roger Lapthorn:
> Hi Steiner (et al),
>
> Have now updated the 472/500kHz transverter schematic and shown an
> additional LPF on the output, which I think is a good idea with a larger
> antenna (not needed with a loop or short, sharply tuned, Marconi. See
> https://sites.google.com/site/g3xbmqrp/Home/472khz-transverter .
>
> 73s
> Roger G3XBM
>
> On 20 October 2012 22:09, Steinar Aanesland <[email protected]> wrote:
>
>> Hi Roger
>>
>> Yes , I thought I saw a red and not a yellow one in your picture ;)
>>
>> I believe you are referring to the C11 when you are writing "wrong value
>> of coupling cap" . What is the new value you propose to use instead of
>> 470nF?
>>
>>
>> LA5VNA Steinar
>> loc:JO59jq
>> Mal and spam filtering: STRONG
>> www.opera.no
>>
>>
>>
>>
>> Den 20.10.2012 21:17, skrev Roger Lapthorn:
>>> Thank you for your kind words Steiner.
>>>
>>> There are a couple of errors on my schematic that I must correct (T50-2
>>> red, not T50-6 yellow in the buffer and the wrong value of coupling cap
>>> between the LO and buffer). I measured the harmonic output on a friend's
>>> spectrum analyser today. If you are not using a sharply tuned antenna
>> like
>>> a loop or short Marconi (like me) then I recommend adding an additional
>> low
>>> pass filter on the output. The one on GW3UEP's page would be ideal. (6n8s
>>> and a 15uH inductor).
>>>
>>> 73s
>>> Roger G3XBM
>>>
>>> On 20 October 2012 19:15, Steinar Aanesland <[email protected]> wrote:
>>>
>>>>
>>>> Hi all,
>>>>
>>>> My 500kHz 10W Transverter is almost ready (just a little cosmetic
>>>> remains) .
>>>> https://dl.dropbox.com/u/16381257/MF_transverter.jpg
>>>>
>>>> A big thanks to Roger G3XBM for this nice and simple design.
>>>> https://sites.google.com/site/g3xbmqrp/Home/472khz-transverter
>>>>
>>>> I don't have the the right equipment for testing the output, but the 15W
>>>> 50ohm dummy load is getting really hot .
>>>>
>>>> The big issue now is the antenna. My first thought was a kind of a T(
>>>> top hat)-antenna, but I have a loop antenna about 80 meter in
>>>> circumference and 6/7 meter above the ground . What about using the loop
>>>> as a capacity on the top of a vertical or using the loop as an ordinary
>>>> loop antenna for 600m ?
>>>>
>>>> --
>>>> LA5VNA Steinar
>>>> loc:JO59jq
>>>> Mal and spam filtering: STRONG
>>>> www.opera.no
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>>
>
>
|
