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   Home   Help Search  
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Author Topic: 1.2Gig  (Read 5784 times)
N9IAG
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Posts: 81




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« on: June 06, 2011, 07:41:34 PM »

What is available commercially for 1.2Gig FM?  1 watt in?
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ZL4IV
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Posts: 70




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« Reply #1 on: June 07, 2011, 12:11:04 AM »

If you want high power then you will have to buy or make the cavity. I use the HI-SPEC 23G23 cavity. If you want even more power out then water cool the tubes. 23cm amps are scarce store brought.

ZL4IV
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VE3EFJ
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Posts: 97




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« Reply #2 on: June 07, 2011, 07:32:49 AM »

FAR Circuits will sell you the circuit board for an amplifier using a Mitsubishi amplifier module. The amp will run a nominal 10W out for 1W in. Documentation comes with the board. The module itself can be purchased through RF Parts for around $87 or so. The complete project will cost between $125 to $150 using all new parts (enclosure, heat sink etc).


Wayne
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K6AER
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Posts: 5743




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« Reply #3 on: June 07, 2011, 09:32:52 AM »

There are plenty of devices available for operation ion the 1.2 GHz range. Most are not designed for specific linear SSB application but with some experimentation the bias could not be set for pretty good linearity.

Some questions first:

How much power do you want out?

This determines how many stages will be necessary for you amplifier.

Linear (class A)  or Class C.

Again this determines how many stages, the devices used and the power supply requirements.

Devices such as the MRF1150M will give you 150 watts peak with about 7.8 dB of gain.

A driver for this device would be a device like the MRF1035B. I has about 10 dB of gain.

The devices are primarily used for TACAN, IFF and DME applications. As a result when not used for pulse application require a reduced output for SSB operation or Class C application.

The base mounts are only capable of so many watts of heat dissipation and in continuous operation the ratings will have to be reduced.

It would help to know what is your exact application.

« Last Edit: June 07, 2011, 10:44:25 AM by K6AER » Logged
N9IAG
Member

Posts: 81




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« Reply #4 on: June 07, 2011, 03:35:00 PM »

I currently have a 1 watt ht, which is quite weak for a mobile or base.  If I spent 1k I could get an id-1 and have 10 watts, but what I'm looking at is getting my 1watt ht up to 10-50 at a reasonable price range.
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K6AER
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Posts: 5743




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« Reply #5 on: June 07, 2011, 04:39:52 PM »



Are you talking FM?
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KB1LKR
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Posts: 1897




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« Reply #6 on: June 07, 2011, 06:55:51 PM »

"What is available commercially for 1.2Gig FM?" & "I currently have a 1 watt ht..."

Looks like FM
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W0BTU
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Posts: 2268


WWW

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« Reply #7 on: June 07, 2011, 07:49:05 PM »

If you want high power then you will have to buy or make the cavity. I use the HI-SPEC 23G23 cavity.

I just Googled that and came up with no results. Is there a Web site where we can see that cavity?
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K6AER
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Posts: 5743




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« Reply #8 on: June 07, 2011, 09:03:13 PM »

You don't need a cavity amplifier. Any solid state amplifier will provide from 7-10 dB gain depending on output power.
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ZL4IV
Member

Posts: 70




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« Reply #9 on: June 08, 2011, 02:56:20 AM »

>16db.
http://w4dex.com/manuals/23cm/hi-spec/

HI-SPEC (USA) for the 23CM band. Will tune 1260-1300 Mhz. Has a gain of > 16dB. Uses a pair of 7289, 2C39A or 3CX100A5 tubes.  Requires HT, filament and bias supplies as well as cooling system blower. A good pair of tubes, operating at 1100 VDC anode voltage will produce stable output power in excess of 100W with less than 3W drive and cooling supplied by a 2 1/4 inch squirrel cage blower. Output in excess of 200W is easily obtained using forced air cooling. Much much more with water cooling like 500W.

The guys are correct, you are better to buy SS modules and set your goal to about 7db and high gain antennas are so easy to make. The good thing is antennas work just as well on receive.

ZL4IV.


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VR2AX
Member

Posts: 1016




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« Reply #10 on: June 08, 2011, 02:20:49 PM »

http://www.kuhne-electronic.de/en/products/power-amplifiers/mku-pa-1330-a.html

Price is quoted as 'on request'..
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N9IAG
Member

Posts: 81




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« Reply #11 on: June 08, 2011, 05:45:33 PM »



Are you talking FM?
Yes
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N9IAG
Member

Posts: 81




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« Reply #12 on: June 08, 2011, 05:55:09 PM »

You don't need a cavity amplifier. Any solid state amplifier will provide from 7-10 dB gain depending on output power.
Ideally it would run on 13.8 VDC, as I would want one mobile.  10-15db is in the range of what Im looking for.
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M0BCG
Member

Posts: 40




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« Reply #13 on: June 12, 2011, 12:00:35 PM »

take a look at berts  PE1RKI website .
superb 23cm and other GHZ band amps that he makes, i combined 2x 300w modules here for eme use to make a 600w output amp which takes 7w drive for max output .
they are 28v  so you can obtain psus relatively easily .
 he has many amps he makes so something to suit most people for most uses
these amps are mainly used for eme work where people use separate rx/tx coax etc and so if intending to use for singole cable systems you may need some though on relays etc and switching .


amps are made to order so you have to wait a few months for them .

w6pql makes combiner pcbs and pe1rki also makes kits for combining pas .

downeast microwave make a fully working 23cm 120w amplifier which may suit you , not a bad price considering the work he does on them .

tube amps are around sometimes but hard to find in fully working condx , the eme 23150 is the most common and uses 2x 2c39a or 7289 tubes , but these can take some looking after and care .

ex tv transmitter amps can be found that use TH328 or other type tubes but will require some work and engineering on them to get them working at 23cm , although a th328 can produce 300w + .


solid state has become much safer than tube amps and high voltages but it all depends on what you want to play with at end of the day .
if you get an eme station setup id love to work you .
73 ian
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N9IAG
Member

Posts: 81




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« Reply #14 on: June 19, 2011, 10:05:45 AM »

My fm radio puts out 400mw or 1.1 watts fm, I need about 30-60 watts out 1240-1300 13.8vdc
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