[MAMS] PLL

Thu Jan 6 14:20:36 EST 2011

I've had an idea for a 24 Ghz transverter this week. My vintage 10 G 
DEMI starts with a crystal at 94.6666 Mhz. Doubles to 189.3333, triples 
to 568, doubles to 1136, triples to 3408, triples to 10224. 3408 + 
189.333 (interdigital converter and filter) gets 3597.33333. 3597.333 
plus 10224 is 13821.333. 24192 - 13821.333 is 10370.666, fed to the 10 G 
transverter comes out at 146.666. Could probably use a waveguide or 3/8" 
pipe cap filter for the 13821 product. There are many surplus filters in 
that range. The NLB310 probably has usable gain at 13.8 GHz yet though 
its not rated past 12 Ghz. If not many a Ku band FET has gain there.

Later crystal DEMI 10G transverters moved the crystal to 189.3333. 
Tapping the LO chain for that frequency shouldn't be hard. The other two 
frequencies already have connector positions used for the initial tune 
up, that could use small coupling capacitors to a MMIC input off the 
board. For the higher frequency mixers I figure on whatever I can lay my 
hands on else setting up a MOSFET as a shunt switch. Its unlikely to 
find a commercial DBM rated for 24 GHz RF, 13 GHZ LO and 10 GHZ IF.

Probably something I should write up as an idea for one of the 
conferences. I think I should work on fixing my 10 G transverter to get 
its sensitivity improved from a 15 dB NF and 100 mw output with parts I 
have on hand rather than work on another band where there's no way to 
make contacts without driving a couple hundred miles north or east.

For those with the noisy Apollo oscillator, moving the fundamental 
synthesizer output to 1145 puts the 1/3 injection at 3435 and the 10 G 
injection at 10305. 3435 + 10305 is 13740. 24192 - 13740 is 10452, and 
with 10305 injection is 147 MHz at the 2m IF. The pipe caps might need 
to be nudged a bit higher in frequency for this application but there's 
one less mixer in the 24 GHz injection chain.

73, Jerry, K0CQ

On 1/6/2011 12:05 PM, Zack Widup wrote:
> Looks like a good deal you got!
>
> I might be able to go to the hill on Saturday or Sunday morning. It
> would be a "warm-up exercise" for the January contest in a few weeks.
> :-)
>
> If you want to give 3456 a try this weekend, let me know.
>
> I'm trying to get some version of a 24 GHz transverter going right now.
>
> 73, Zack
>
>
> On 1/6/11, mary boller<w9obg at yahoo.com>  wrote:
>> There is a guy in Hawaii that sells the Harris stuff. I bought a 1.5 watt
>> amp
>> from him, and wanted to buy another. He said he would sell me that one and
>> the
>> 750 mw job for 2304 as well, plus a whole lot of other stuff for 40 bucks
>> which
>> included the postage. This brick was in with the goodies he sent, along with
>> that lna. I don't really have any use for it, but  its too good to toss. I
>> got a
>> ton of ut141 cables, some couplers, circulators, and splitters in the
>> goodies
>> portion. He emailed me last night wanting to send me another batch of sma
>> cables
>> for free. I told him I would see if I could find out of the brick it useful
>> or
>> not. No info on it whatsoever and Harris won't talk to anyone. I  would be
>> glad
>> to send it on to you to putter with if you are interested. None of us know
>> how
>> to make it work. I do have the 5760 rig that works quite well and we do need
>> to
>> work on 3456. I have built a 15 watt 2304 using Pauls pipe cap board and it
>> works very well. I stuck that harris pre amp on in front of it and it seems
>> to
>> be a jewel. I have opened some of the harris stuff up and its beautifully
>> made,
>> nothing cheap about it. I got the 1.5 watt 2304 amp from him for 12 bucks,m
>> without the four inch square and foot long heat sink harris had it kmounted
>> on
>> 29.95 with the heat sink. I send return postage along with the brick by the
>> way
>>
>>
>>
>>
>> ________________________________
>> From: Zack Widup<w9sz.zack at gmail.com>
>> To: Mid-America Microwave Society<mams at mailman.qth.net>
>> Sent: Thu, January 6, 2011 11:45:18 AM
>> Subject: Re: [MAMS] PLL
>>
>> Hi Wally,
>>
>> What do you plan on using it for? You have a 5760 transverter, don't
>> you? I think I worked you on that band. (BTW we need to try for 3456
>> again some time! Maybe this weekend?)
>>
>> For a 144 MHz IF, you'd want a 5616.0 MHz LO for low-side injection.
>> For high side injection you'd probably want to use 5905.0 MHz and tune
>> down from 145 MHz. My personal preference is low-side injection
>> because I don't like tuning backwards. Looks like that MIGHT be a
>> little low for its range with low-side injection. If the price is
>> right I'd probably get one to experiment with but I don't think I
>> personally would spend over $25 on one.
>>
>> Come to think of it, I may have a Frequency West brick for that range
>> that I never used. I think I got it for $10 on eBay a few years ago. I
>> was thinking of making it into a beacon at the time.
>>
>> 73, Zack W9SZ
>>
>>
>> On 1/6/11, mary boller<w9obg at yahoo.com>  wrote:
>>> I have a Harris microwave pll for 5.8 to7.2 GHz, and I know where there
>>> are
>>> several more like it at reasonable prices. I have absolutely no
>>> information
>>> whatsoever on how to hook it up or power it. There are five wires going
>>> in.
>>>
>>> The model number is SD110009-106 S/n is 14 and the date code is 1196.
>>> There
>>> is a
>>> website called Star Microwave that lists it. but I have not been able to
>>> bring
>>> up any info. I am also pretty sure that the contacts I had at Harris 20
>>> years
>>> ago are long gone. So, the questions are: Is it usable for ham
>>> frequencies.
>>> I
>>> sent it to Randy, WB0JQQ and he is not sure if it can be retuned without a
>>> new
>>> crystal. The frequencies listed on the outside that are adjustable are
>>> 6326.540mhz and 105.44233 mhz. I also aquired an lna from the same
>>> equipment
>>> and
>>> it really works good. It is so well built you could drive over it with a
>>> car
>>> and
>>> not damage it at all.
>>> Anybody : Recognize the PLL: have any  printed info on it: know where info
>>> can
>>> be obtained:. I will ship it to anyone who might be interested in reverse
>>> engineering it
>>> Wally Boller, W9OBG
>>>
>>>
>>>
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